Technical Information

P–HP

DuPont™ Suva® HP80 (R-402A) refrigerantDuPont™ Suva® HP81 (R-402B) refrigerantDuPont™ Suva® 404A (HP62) refrigerant

DuPont™Suva® HP

RefrigerantsProperties, Uses,

Storage, and Handling

DuPont™ Suva®

refrigerants

DuPont™ Suva® HP RefrigerantsProperties, Uses, Storage, and Handling

Table of ContentsPage

Introduction ................................................................................................................. 1Background ................................................................................................................ 1Suva® HP Refrigerants ............................................................................................... 1

Uses ............................................................................................................................. 1

Physical Properties ..................................................................................................... 2

Chemical/Thermal Stability ........................................................................................ 2Stability with Metals .................................................................................................... 2Thermal Decomposition ............................................................................................10Compatibility Concerns if R-502 and Suva® HP Refrigerants Are Mixed ...................10

Materials Compatibility ............................................................................................10Elastomers ................................................................................................................10Motor Materials .........................................................................................................12Desiccants ................................................................................................................13Refrigeration Lubricants ............................................................................................13

Safety ...........................................................................................................................13Inhalation Toxicity ......................................................................................................13Cardiac Sensitization .................................................................................................15Skin and Eye Contact ................................................................................................15Spills or Leaks ...........................................................................................................15Combustibility of Suva® HP Refrigerants ...................................................................15

Air Monitors and Leak Detection ..............................................................................16Types of Detectors ....................................................................................................16

Nonselective Detectors ..........................................................................................17Halogen-Selective Detectors .................................................................................17Compound-Specific Detectors ...............................................................................17Fluorescent Additives ............................................................................................17

Storage and Handling ................................................................................................17Shipping Containers in the U.S. .................................................................................17Bulk Storage Systems ...............................................................................................18

Converting Bulk Storage Tanks from R-502 to Suva® HP Refrigerants..................19Material Compatibility Concerns ............................................................................19

Handling Precautions for Suva® HP Refrigerant Shipping Containers .......................19

Recovery, Recycle, Reclamation and Disposal .......................................................20Recovery ...................................................................................................................21Recycle .....................................................................................................................21Reclamation ..............................................................................................................21Disposal ....................................................................................................................21

1

IntroductionBackgroundChlorofluorocarbons (CFCs), which were devel-oped over 60 years ago, have many unique prop-erties. They are low in toxicity, nonflammable,noncorrosive, and compatible with other materials.In addition, they offer the thermodynamic andphysical properties that make them ideal for avariety of uses. CFCs are used as refrigerants; asblowing agents in the manufacture of insulation,packaging, and cushioning foams; as cleaningagents for metal and electronic components; andin many other applications.However, the stability of these compounds, coupledwith their chlorine content, has linked them todepletion of the earth’s protective ozone layer. Asa result, DuPont has phased out production of CFCsand introduced environmentally acceptable alterna-tives, such as the DuPont™ Suva® HP refrigerantfamily.

Suva® HP RefrigerantsThe products designated as Suva® HP refrigerantsare intended as replacements for R-502 in medium-and low-temperature refrigeration systems. TheSuva® HP refrigerant family contains two differenttypes of refrigerants. Both types involve the use ofrefrigerant blends to achieve alternatives that willact very much like R-502 in refrigeration systems.The first type of blends incorporate the followingrefrigerants in two compositions to optimize differ-ent performance characteristics:

HCFC-22 HFC-125 Propane

Suva® HP80(R-402A), wt% 38 60 2

Suva® HP81(R-402B), wt% 60 38 2

Table 1Refrigerant Information

Refrigerant Chemical Name Formula CAS No. Molecular Wt.

HCFC-22 Chlorodifluoromethane CF2HCl 75-45-6 86.47

HFC-125 Pentafluoroethane CF3CHF2 354-33-6 120.02

HFC-134a 1,1,1,2-Tetrafluoroethane CF3CH2F 811-97-2 102.0

HFC-143a 1,1,1-Trifluoroethane CF3CH3 420-46-2 84.08

HC-290 Propane C3H8 74-98-6 44.1

In addition, DuPont has formulated a mixture basedon all-HFC refrigerants, which results in no ozonedepletion factor. This refrigerant is called Suva®

404A (HP62), and its composition is:

HFC-125 HFC-143a HFC-134a

Suva® 404A(HP62), wt% 44 52 4

The individual components of the three mixturesare listed in Table 1 to show their chemical namesand formulae. In addition, the physical propertiesof the Suva® HP refrigerants are listed in Table 3.

UsesThe Suva® HP refrigerants can be used in virtuallyall R-502-based applications, either as a result ofretrofiting existing equipment that uses R-502 orfollowing development of new equipment designedto use the Suva® HP products.R-502 currently serves a wide range of applicationsin the refrigeration industry. It is used widely insupermarket applications, in food service and ware-housing, for transport refrigeration, in cascade sys-tems for very low temperatures, and other assortedapplications. It offers good capacity and efficiencywithout suffering from the high compressor dis-charge temperatures that can be seen with HCFC-22 single-stage equipment.Suva® HP80 and HP81, which contain HCFC-22,are each formulated to optimize different perfor-mance characteristics.Suva® HP80 offers compressor discharge temper-atures equivalent to R-502, with improved capac-ity versus R-502, and slightly lower theoreticalefficiency.

The DuPont Oval Logo, DuPont™, The miracles of science™, andSuva® are trademarks or registered trademarks of E. I. du Pont deNemours and Company.

Suva® HP81 offers the highest efficiency versusR-502, with slightly better capacity. However, thehigher HCFC-22 content results in compressordischarge temperatures in the range of 14°C (25°F)higher than that of R-502, which makes Suva®

HP81 most suited for medium-temperature systemssuch as ice machines.Suva® 404A (HP62) offers the best overall proper-ties when compared with R-502. Capacity and effi-ciency values should be equivalent to R-502, andcompressor discharge temperatures may be up to9°C (14°F) lower than R-502, which may equate tolonger compressor life and better lubricant stability.In addition, the heat transfer characteristics ofall the Suva® HP products appear to be better thanR-502, so any loss of compression efficiency maybe offset by improvements in heat transfer.Due to the differences in operating characteristicsdescribed above, Suva® HP80 and HP81are typi-cally selected for different applications. Suva®

HP81 is preferred where higher energy efficiencyand capacity are needed and where the higher dis-charge temperatures will not create operating diffi-culties. Both Suva® HP80 and Suva® 404A (HP62)are full-range R-502 replacements, with Suva®

HP80 preferred for retrofitting of existing systems,and Suva® 404A (HP62) preferred for new equip-ment. Suva® 404A (HP62) can also be used forretrofitting existing equipment where HFCs aredesired. Table 2 shows markets that currently useeach of these refrigerants.

Table 2DuPont™ Suva® HP Refrigerant

Market ApplicationsProduct Medium Temperature Low Temperature

Suva® HP81 Ice Machines To Be DeterminedFood ServiceVendingSupermarket

Suva® HP80 Supermarket SupermarketTransport Transport

Food ServiceSuva® 404A

(HP62) All

Physical PropertiesGeneral physical properties of the Suva® HP refrig-erants are shown in Table 3. Pressure-enthalpy dia-grams for the Suva® HP refrigerants are shown inFigures 1–6.Additional physical property data may be foundin other DuPont publications. Bulletin ART-18contains viscosity, thermal conductivity, and heatcapacity data for saturated liquid and both saturatedand superheated vapor. ART-18 also contains heatcapacity ratios for saturated and superheated vapor.

Thermodynamic tables in English and SI units areavailable in Bulletins T-HP80-ENG, T-HP80-SI,T-HP81-ENG, T-HP81-SI, T-HP62-ENG, andT-HP62-SI for Suva® HP80, Suva® HP81, andSuva® 404A (HP62).

Chemical/Thermal StabilityStability with MetalsStability tests for refrigerant with metals are typi-cally performed in the presence of refrigerationlubricants. Results of sealed tube stability testsavailable for R-502/mineral oil and alkylbenzenelubricants have shown long-term stability in contactwith copper, steel, and aluminum in actual refrig-eration systems. Mineral oils, alkylbenzene, mix-tures of mineral oil/alkylbenzene and polyol esters(POE) are all possible candidates for use withSuva® HP80 and HP81; POE are proposed lubri-cants for use with Suva® 404A (HP62).The method followed was generally the same asASHRAE 97 with several minor modifications. A3-mL volume of refrigerant/lubricant solution washeated in the presence of copper, steel, and alumi-num coupons in an oven for 14 days at 175°C(347°F). Both the neat lubricant and a mixture oflubricant and refrigerant (50/50 volume ratio) weretested. Visual ratings were obtained on both theliquid solutions and the metal coupons after thedesignated exposure time. The visual ratings rangefrom 0 to 5, with 0 being best.After the visual ratings were obtained, sample tubeswere opened and the lubricant and refrigerant (ifpresent) were analyzed. The lubricant was typicallychecked for halide content and viscosity, while therefrigerant was examined for the presence of de-composition products. Table 4 summarizes typicaldata for Suva® HP refrigerants. Visual ratings arelisted for the neat lubricant, the lubricant/refriger-ant solution, and the three metals that were presentin the lubricant/refrigerant solutions. Viscosity wasdetermined on the unused lubricant, the tested neatlubricant, and the lubricant tested in the presenceof refrigerant. Decomposition products were deter-mined in some cases. Typical measurements fordecomposition products is in the low parts permillion (ppm) range.Suva® HP81 tests with various lubricants indicate ithas adequate chemical stability with these lubri-cants. In addition, we believe that HP80 will havesimilar behavior due to the same refrigerants beingused in the formulation. Suva® 404A (HP62) testswith common POE lubricants indicate that chemi-cal stability of Suva® 404A (HP62) with commonmetals used in refrigeration systems is acceptable.

2

3

Table 3General Property Information

Suva® HP80 Suva® HP81 Suva® 404APhysical Property Unit (R-402A) (R-402B) (HP62)

Molecular Wt, avg. g/mol 101.55 94.71 97.6Boiling Point, 1 atm °C –49.2 –47.4 –46.5

°F –56.5 –53.2 –51.6Freezing Point °C n/a n/a n/a

°FCritical Temperature °C 75.5 82.6 72.1

°F 167.9 180.7 161.7Critical Pressure kPa 4135 4445 3732

psia 599.7 644.8 541.2Critical Density kg/m3 541.7 530.7 484.5

lb/ft3 33.82 33.13 30.23Liquid Density at 25°C (77°F) kg/m3 1151 1156 1048

lb/ft3 71.86 72.14 65.45Density, Saturated Vapor kg/m3 19.93 16.90 18.20

at –15°C (5°F) lb/ft3 1.24 1.05 1.14Specific Heat at 25°C (77°F) Liquid kJ/kg•K 1.37 1.34 1.53

Btu/lb•°F 0.328 0.320 0.367Vapor, 1 atm kJ/kg•K 0.755 0.725 0.870

Btu/lb•°F 0.181 0.173 0.207Vapor Pressure at 25°C (77°F) kPa 1337 1254 1255

psia 194.0 181.9 182.0Heat of Vaporization kJ/kg 194.0 210.0 202.1

at Boiling Point Btu/lb 83.5 90.3 87.0Thermal Conductivity at 25°C (77°F)

Liquid W/m•K 6.91E-2 7.35E-2 6.83E-2Btu/hr•ft•°F 4.00E-2 4.25E-2 3.94E-2

Vapor, 1 atm W/m•K 1.266E-2 1.205E-2 1.346E-2Btu/hr•ft•°F 7.32E-3 6.96E-3 7.78E-3

Viscosity at 25°C (77°F)Liquid Pa•s 1.38E-4 1.45E-4 1.28E-4Vapor, 1 atm Pa•s 1.29E-5 1.28E-5 1.22E-5

Flammability Limit vol% None None Nonein Air, 1 atm

Ozone-Depletion Potential (CFC-12 = 1) 0.02 0.03 0.0Halocarbon Global (CFC-11 = 1) 0.63 0.52 0.94

Warming PotentialTSCA Inventory Status Reported/Included? Yes Yes YesInhalation Exposure Limit AEL* ppm 1000 1000 1000

(8- and 12-hr TWA)

* AEL (acceptable exposure limit) is an airborne inhalation exposure limit established by DuPont which specifies time-weightedaverage concentrations to which nearly all workers may be repeatedly exposed without adverse effects.

Figure 1. DuPont™ Suva® 404A (HP62) Pressure–Enthalpy Diagram (SI Units)

4

DuPo

nt™

Suva

® 40

4A (H

P62)

Pres

sure

-Ent

halp

y D

iagr

am(S

I Uni

ts)

Figure 2. DuPont™ Suva® 404A (HP62) Pressure–Enthalpy Diagram (English Units)

5

DuPo

nt™

Suva

® 40

4A (H

P62)

Pres

sure

-Ent

halp

y D

iagr

am(E

nglis

h U

nits

)

Figure 3. DuPont™ Suva® HP80 (R-402A) Pressure–Enthalpy Diagram (SI Units)

6

DuPo

nt™

Suva

® H

P80 (

R-40

2A)

Pres

sure

-Ent

halp

y D

iagr

am(S

I Uni

ts)

Figure 4. DuPont™ Suva® HP80 (R-402A) Pressure–Enthalpy Diagram (English Units)

7

DuPo

nt™

Suva

® H

P80 (

R-40

2A)

Pres

sure

-Ent

halp

y D

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am(E

nglis

h U

nits

)

Figure 5. DuPont™ Suva® HP81 (R-402B) Pressure–Enthalpy Diagram (SI Units)

8

DuPo

nt™

Suva

® H

P81 (

R-40

2B)

Pres

sure

-Ent

halp

y D

iagr

am(S

I Uni

ts)

Figure 6. DuPont™ Suva® HP81 (R-402B) Pressure–Enthalpy Diagram (English Units)

9

DuPo

nt™

Suva

® H

P81 (

R-40

2B)

Pres

sure

-Ent

halp

y D

iagr

am(E

nglis

h U

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)

Note: Lubricant/refrigerant combinations shownthroughout this report are for the purposes of com-paring the stability and compatibility of differentlubricants with the Suva® HP products. No recom-mendation is made or implied that these combina-tions will operate successfully in refrigerationsystems.

Thermal DecompositionLike R-502, Suva® HP refrigerants will decomposewhen exposed to high temperature or flamesources. Decomposition may produce toxic andirritating compounds, such as hydrogen chlorideand hydrogen fluoride. The decomposition productsreleased will irritate the nose and throat. Therefore,it is important to prevent decomposition by follow-ing DuPont Material Safety Data Sheet (MSDS)recommendations for handling and use.

Compatibility Concerns if R-502 andSuva® HP Refrigerants Are MixedR-502 and Suva® HP refrigerants are chemicallycompatible with each other; this means that theydo not react with each other and form other com-pounds. However, when the different refrigerantsare mixed by accident or deliberately, they willform mixtures that can be very difficult to separate.Therefore, mixtures of R-502 and Suva® HPrefrigerants cannot be separated in on-site recyclemachines or in the typical facilities of an off-sitereclaimer. These mixtures will have to be disposedof by incineration.Also, mixtures of R-502 and Suva® HP refrigerantswill have performance properties different fromeither refrigerant alone. These properties may notbe acceptable for your systems. Therefore, we donot recommend mixing R-502 and Suva® HP refrig-erants in any systems. First remove the R-502 prop-erly (see page 21 for recovery discussion) and thencharge the new refrigerant.

Materials CompatibilityBecause the Suva® HP refrigerants will be used inmany different applications, it is important to re-view materials of construction for compatibilitywhen designing new equipment, retrofitting exist-ing equipment, or preparing storage and handlingfacilities. Because the Suva® HP products havebeen designed as refrigerants, the compatibilitydata summarized here will include materialscommonly used in refrigeration applications.

ElastomersCompatibility results for Suva® HP81 and Suva®

404A (HP62) were developed with five differentpolymer and lubricant combinations. It was as-sumed that Suva® HP80 compatibility would besimilar to HP81.Recognize that these data reflect compatibility insealed tube tests, and that refrigerant compatibilityin real systems can be influenced by the actual op-erating conditions, the nature of the polymers used,compounding formulations of the polymers, and thecuring or vulcanization processes used to create thepolymer. Polymers should always be tested underactual operating conditions before reaching finalconclusions about their suitability.The rankings shown in Table 5 are based on dupli-cate samples of each polymer subjected to agingat 150°C (302°F) for 30 days in various lubricant/refrigerant combinations. Physical properties of thetest samples were determined before and after ag-ing. The resulting ratings are based on 1 being bestand 5 being worst for the purposes of comparison.The factors included in the overall assessment ofcompatibility included:• visual observations of material changes due

to aging• changes in weight and volume of the samples

due to aging• changes in hardness of the samples due to aging• changes in flexural properties of the samples

due to aging• recovery of weight and flexural properties after

refrigerant evaporationThe compounds tested were:• PTFE (Teflon®, commercial-grade skived sheet,

from Tex-O-Lon Mfg. Co.)• Neoprene W (from Precision Rubber Co.)• HNBR (hydrogenated nitrile butadiene, N1195

from Parker Seal Co.)• EPDM (ethylene propylene diene, commercial

grade, Kirkhill Rubber Co.)• NBR (BUNA N, nitrile butadiene, from Parker

Seal Co.)Lubricants tested:• Mineral Oil, Suniso 3GS, Witco Corporation• Alkylbenzene, Zerol 150 TD, Shrieve Chemical

Products Inc.• Polyol Ester, Icematic SW32, Castrol• Polyol Ester, Arctic EAL22, Mobil

Chemical

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Table 4Stability of HP Refrigerants with Metals and Lubricants

Suva® HP81 with various lubricants

HP81 with HP81 withMineral Oil, Alkylbenzene, HP81 with

Suniso Zerol Polyol Ester, CastrolProperty 3GS 150 TD Icematic SW32

Viscosity of NeatOil at 40°C (104°F), (mm)2/s (cSt) ND ND 29.6

Stability TestsVisual RatingsNeat Oil 0 ND 1,HOil/Refrig 1,G,H 2,P 0Copper 0 2,T 0Iron 0 0 1,TAluminum 0 0 0

Viscosity Change% Change Neat ND ND 5.0% Change w/ Refrig ND ND –13.3

Decomposition Analysis[F-], ppm ND ND 7[Cl-], ppm ND ND 7

(values for Suva® HP80 assumed to be comparable)

Suva® 404A (HP62) with various lubricants

Suva® 404A (HP62) Suva® 404A (HP62) Suva® 404A (HP62) Suva® 404A (HP62)with Mineral Oil, with Alkylbenzene, with with

Suniso Zerol Polyol Ester, Castrol Polyol Ester, MobilProperty 3GS 150 TD Icematic SW32 Arctic EAL22

Viscosity of NeatOil at 40°C (104°F), (mm)2/s (cSt) ND ND 29.6 23.7

Stability TestsVisual RatingsNeat Oil 0 0 1,H 0Oil/Refrig. 1,G 2,P,G,H 0,G 1,GCopper 0 2,T 0 0Iron 0 1,T 1,T,P 0Aluminum 0 0 0 0Viscosity Change% Change Neat ND ND 5.0 ND% Change w/ Refrig. ND ND ND ND

Visual Ratings: Stability Ratings: 0 to 5ND = Not Determined 0 = Best

G = Gel 3 = FailedT = Tarnish 5 = CokedH = HazeP = Precipitate

Motor MaterialsIn hermetic and semihermetic compressors, thecompressor motor is normally cooled by directcontact with refrigerant returning from the evapora-tor. As a result, the motor must be compatible withthe refrigerants and lubricants used in the refrigera-tion system.Accelerated aging tests were conducted withcombinations of refrigerants, lubricants, and motormaterials using sealed tube tests prepared accordingto ANSI/ASHRAE 97-1989. After aging, the mate-rials in the tubes were inspected visually and micro-scopically and tested physically and chemically todetermine property changes.Materials tested, and a summary of test results, aredescribed below.

PET (polyethylene terephthalate,Mylar®)PET film is used as phase and slot insulation inhermetic motors. Visual inspection of sealed tubesafter aging in refrigerant environments revealed noextracts with refrigerant alone [R-502, Suva® HP81,or Suva® 404A (HP62)], but varying degrees ofcloudiness and light precipitates when lubricantswere present.PET weight change on aging was small (<5%) andoccurred with R-502/lubricant and HP81/lubricantcombinations. Weight gain with Suva® 404A(HP62) /ester lubricants was 2% or less.PET flexibility after aging was determined by abend test. The results show excellent retention offlexibility on aging at 135°C (275°F). There is

definite loss of flexibility when PET is aged inR-502/mineral oil or R-502/alkylbenzene at 150°C(302°F). This loss of flexibility does not occurwhen PET is aged in HP81 or Suva® 404A (HP62)with ester lubricants at 150°C (302°F).

Polyesterimide Enameled Motor Wire,amide-imide overcoated (NEMA NW35C)No extracts or precipitates were observed onaging the enameled wire in any of the lubricant/refrigerant combinations. No blistering, crazing, orcracking was observed after aging. Retention offlexibility was confirmed by 1x bend tests of thewire after aging.

Dacron®/Mylar®/Dacron® lead wire(Belden 14 AWG)After aging of D-M-D samples in refrigerant/lubricant environments, contents of the tubeswere inspected for particulates, the tubes werecooled and opened, and the lead wire sampleswere subjected to bend tests. Minimal particulatesor extracts were observed after aging. PETembrittlement, ranging from slight loss offlexibility to shattering, was observed whenspecimens were bent 135 degrees. The degreeof embrittlement appeared to be a factor of thelubricant, rather than the refrigerant. All D-M-Dsamples were embrittled in the presence of mineraloil or alkylbenzene lubricants. Good flexibility wasseen after aging with polyol esters in the presenceof all refrigerants.

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Table 5Relative Ranking of Polymer/Refrigerant/Lubricant Compatibility

Polymer

Refrigerant/Lubricant PTFE HNBR Neoprene W EPDM NBR

R-502 neat 2 4 2 2 1R-502/Mineral Oil 2 4 4 5 2R-502/Alkylbenzene 2 4 2 5 2

HP81 neat 2 4 2 2 2HP81/Mineral Oil 2 4 4 5 2HP81/Alkylbenzene 2 4 2 5 2HP81/Castrol Ester 2 4 2 2 5HP81/Mobil Ester 2 4 2 1 5

404A (HP62) neat 2 1 1 2 1404A (HP62)/Mineral Oil 2 2 4 5 2404A (HP62)/Alkylbenzene 2 2 3 5 2404A (HP62)/Castrol Ester 2 4 2 1 5404A (HP62)/Mobil Ester 2 4 2 1 5

(1 → 5; best → worst)

SummaryIn summary, ester-based lubricants appear to causemuch less effect on common motor materials thanmineral oils or alkylbenzene lubricants. In all cases,the results appeared to be better than R-502 withlubricants commonly used with R-502.

DesiccantsIn refrigeration systems, keeping the refrigerantand lubricant free of moisture is very important.Dryers filled with moisture-absorbing desiccant aretypically used to prevent moisture accumulation. Adesiccant used with R-502, UOP’s (formerly UnionCarbide Molecular Sieve) 4A-XH-5, is not gener-ally compatible with highly fluorinated refrigerantssuch as the Suva® HP products. However, compat-ible molecular sieve desiccants, such as XH-9, havebeen developed. For loose-filled and solid coredryers, new desiccants are available that are alsocompatible with the new refrigerants and lubri-cants. Be sure to tell your parts wholesaler whatrefrigerants you plan to use when specifying thedryer for your system.

Refrigeration LubricantsMost compressors require a lubricant to protectinternal moving parts. The compressor manufac-turer usually recommends the type of lubricant(s)and proper viscosity that should be used to ensureacceptable operation and equipment durability.Recommendations are based on several criteria,which can include lubricity, miscibility, compatibil-ity with materials of construction, thermal stability,and compatibility with other lubricants. It is impor-tant to follow the manufacturers’ recommendationsfor lubricants to be used with their equipment.Current lubricants used with R-502 have at leastpartial miscibility with R-502, which eases theproblems of designing systems to allow lubricantreturn back to the compressor. Many refrigerationsystems take advantage of this miscibility whenconsidering lubricant return.Note: Field experience has shown that Suva® HP81works successfully with mineral oil in many smallhermetic systems where oil return is not a concern.Refrigerants such as the Suva® HP products, withlittle or no chlorine present in them, may exhibitless miscibility with common lubricants used withR-502. Although many R-502 systems operatingat low temperatures allow for reduced miscibilitywith the lubricant, it is important to know that thelubricants used with the Suva® HP refrigerants willreturn to the compressor using existing equipmentdesigns.

Different compressor and equipment manufacturerswill recommend lubricants to use with their equip-ment and the Suva® HP products. It would be diffi-cult to summarize all possible lubricant candidatesthat may be screened by various equipment manu-facturers. In addition, there will be continuing re-search and development of new lubricants that wemay not have tested because the market for alterna-tive refrigerants continues to stimulate other marketareas. Review your system needs with the equip-ment manufacturer, DuPont distributor, certifiedrefrigeration service contractor, or other qualifiedparty. Never assume the current lubricant in yourrefrigeration system will be acceptable with theSuva® HP refrigerant you intend to use. Alwaysreview system components for compatibility withthe new refrigerant and possibly a new lubricant.Table 6 shows a summary of miscibility tests donewith a 50/50 volume mixture of refrigerant andlubricant over a wide range of temperatures, withvisual inspection for phase separation as the tubesare slowly warmed. This table does not show thatany refrigerant/lubricant combination is acceptable,only whether the two appear to be miscible at theconditions shown.

SafetyUsers must have and understand the applicableSuva® HP refrigerant Material Safety Data Sheets.

Inhalation ToxicitySuva® HP refrigerants pose no acute or chronichazard when they are handled in accordance withDuPont recommendations and when exposures aremaintained below recommended exposure limits,such as the DuPont acceptable exposure limit(AEL) of 1,000 ppm, 8- or 12-hour time-weightedaverage (TWA).An AEL is an airborne exposure limit establishedby DuPont that specifies time-weighted average forairborne concentrations to which nearly all workersmay be repeatedly exposed without adverse effects.The AEL for the Suva® HP refrigerants is the samelevel as the threshold limit value (TLV) establishedfor HCFC-22 and calculated for R-502 based onthe TLVs for the components.However, like R-502, exposure above the recom-mended exposure limit to the vapors of Suva® HPrefrigerants by inhalation may cause human healtheffects that can include temporary nervous systemdepression with anesthetic effects such as dizziness,headache, confusion, loss of coordination, and even

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R-502

w/mineral oil–60 +73 +80

2 phases 2 phases(inversion)

w/alkylbenzene–60 –27 +802 phases 1 phase

Suva® HP81

w/mineral oil–60 +68 +80

2 phases 2 phases(inversion)

w/alkylbenzene–60 +16 +80

2 phases 1 phasew/polyol ester

–60 +801 phase

Suva® HP80

w/mineral oil–50 +65 +72

2 phases 2 phases(inversion)

w/alkylbenzene–50 +66 +72

2 phases 2 phases(inversion)

w/polyol ester–50 +72

1 phase

Suva® 404A (HP62)

w/mineral oil–60 +52 +80

2 phases 2 phases(inversion)

w/alkylbenzene–60 +57 +80

2 phases 2 phases(inversion)

w/polyol ester–60 +80

1 phase

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Table 6Miscibility Summary

Note: All temperatures in °C

15

loss of consciousness. Higher exposures to the va-pors may cause temporary alteration of the heart’selectrical activity with irregular pulse, palpitations,or inadequate circulation. Death can occur fromgross overexposure. Intentional misuse or deliber-ate inhalation of Suva® HP refrigerant vapors maycause death without warning. This practice is ex-tremely dangerous.A person experiencing any of the initial symptomsshould be moved to fresh air and kept calm. Ifbreathing is difficult, administer oxygen. If notbreathing, administer artificial respiration. Calla physician.

Cardiac SensitizationAs with many other halocarbons and hydrocarbons,inhalation of Suva® HP refrigerants followed byintravenous injection of epinephrine, to simulatehuman stress reactions, results in a cardiac sensiti-zation response. In humans, this can lead to cardiacirregularities and even cardiac arrest. The likeli-hood of these cardiac problems increases if you areunder physical or emotional stress. The Suva® HPrefrigerants can cause these responses well abovethe AEL, but the effect level varies with people,and has not been fully determined.If you are exposed to very high concentrations ofSuva® HP refrigerants, move immediately from thearea, and seek medical attention as a precaution.Do not attempt to remain in the area to fix a leak orperform other duties—the effects of overexposurecan be very sudden.Medical attention must be given immediately ifsomeone is having symptoms of overexposure toSuva® HP refrigerants. Do not treat the patient withdrugs such as epinephrine. These drugs could in-crease the risk of cardiac problems. If the person ishaving trouble breathing, administer oxygen. Ifbreathing has stopped, administer artificial respira-tion. Call a physician.

Skin and Eye ContactAt room temperature, Suva® HP refrigerant vaporshave little or no effect on the skin or eyes. How-ever, in liquid form, they can freeze skin or eyeson contact, causing frostbite. If contact with liquiddoes occur, soak the exposed areas in lukewarmwater, not cold or hot. In all cases, seek medicalattention immediately.Always wear protective clothing when there isa risk of exposure to liquid refrigerants. Wheresplashing of refrigerant may occur, always weareye protection and a face shield.

Spills or LeaksIf a large release of vapor occurs, such as froma large spill or leak, the vapors may concentratenear the floor or in low elevation areas, which candisplace the oxygen needed for life, resulting insuffocation.Evacuate everyone until the area has been wellventilated. Re-enter the area only while usingself-contained breathing apparatus. Use blowersor fans to circulate the air at floor or low levels.Always use self-contained breathing apparatus oran air-line respirator when entering tanks or otherareas where vapors might exist. Use the buddy sys-tem (a second employee stationed outside the tank)and a lifeline. Refer to the Material Safety DataSheet for the specific Suva® HP refrigerant youplan to use.Suva® HP refrigerants have virtually no odor, andtherefore can be extremely difficult to detect inenclosed areas. Frequent leak checks and the instal-lation of permanent leak detectors may be neces-sary for enclosed areas or machinery rooms. Referto ASHRAE Standards 15 and 34 for machineryroom requirements.To ensure safety when using Suva® HP refrigerantsin enclosed areas:1. Route relief and purge vent piping outdoors,

away from air intakes.2. Make certain the area is well ventilated at all

times; use auxiliary ventilation, if necessary, toremove vapors.

3. Make sure the work area is free of vapors priorto beginning any work.

4. Install air monitoring equipment to detect leaks.

Combustibility of Suva® HPRefrigerantsSuva® 404A (HP62), HP80 and HP81 are not flam-mable in air at temperatures up to 100°C (212°F) atatmospheric pressure. However, mixtures of HP62,HP80 or HP81 with high concentrations of air atelevated pressure and/or temperature can becomecombustible in the presence of an ignition source.Suva® 404A (HP62), HP80 and HP81 can also be-come combustible in an oxygen enriched environ-ment (oxygen concentrations greater than that inair). Whether a mixture containing Suva® 404A(HP62), HP80 or HP81 and air, or Suva® 404A(HP62), HP80 or HP81 in an oxygen enrichedatmosphere becomes combustible depends on theinter-relationship of 1) the temperature 2) thepressure, and 3) the proportion of oxygen in the

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mixture. In general, Suva® 404A (HP62), HP80 orHP81 should not be allowed to exist with air aboveatmospheric pressure or at high temperatures; or inan oxygen enriched environment. For example:HP62, HP80 or HP81 should NOT be mixedwith air under pressure for leak testing or otherpurposes.Refrigerants should not be exposed to open flamesor electrical heating elements. High temperaturesand flames can cause the refrigerants to decompose,releasing toxic and irritating fumes. In addition, atorch flame can become dramatically larger orchange color if used in high concentrations of manyrefrigerants including R-500 or R-22, as well asmany alternative refrigerants. This flame enhance-ment can cause surprise or even injury. Alwaysrecover refrigerants, evacuate equipment, and venti-late work areas properly before using any openflames.Based on the above information, the followingoperating practices are recommended.

• Do Not Mix With Air For Leak Testing– Equipment should never be leak tested with a

pressurized mixture of HP62, HP80 or HP81and air. Pressurized mixtures of dry nitrogenand HP62, HP80 or HP81 can be used for leaktesting.

• Bulk Delivery and Storage– Tanks should be evacuated prior to initial

filling, and should never be filled while underpositive air pressure.

– Tank pressure should never be allowed toexceed the tank manufacturer’s maximumallowable working pressure when filling withHP62, HP80 or HP81. Relief devices on eitherthe tanks or the supply system should bepresent and in good operating condition.

– Tank pressures should be monitored routinely.– Air lines should never be connected to storage

tanks.

• Filling and Charging Operations– Before evacuating cylinders or refrigeration

equipment, any remaining refrigerant shouldbe removed by a recovery system.

– Vacuum pump discharge lines should be freeof restrictions that could increase dischargepressures and result in the formation of com-bustible mixtures.

– Cylinders or refrigeration equipment shouldbe evacuated at the start of filling, andshould never be filled while under positiveair pressure.

– Filled cylinders should periodically be analyzedfor air (nonabsorbable gas or NAG).

• Refrigerant Recovery SystemsEfficient recovery of refrigerant from equipmentor containers requires evacuation at the end ofthe recovery cycle. Suction lines to a recoverycompressor should be periodically checked forleaks to prevent compressing air into the recoverycylinder during evacuation. In addition, therecovery cylinder pressure should be monitored,and evacuation stopped in the event of a rapidpressure rise indicating the presence of air. Therecovery cylinder contents should then be ana-lyzed for NAG, and the recovery system leakchecked if air is present. Do not continue toevacuate a refrigeration system that has amajor leak.

• Combustibility With ChlorineExperimental data have also been reportedwhich indicate combustibility of HCFC-22 (acomponent of HP80 and HP81) in the presenceof chlorine.

Air Monitors and Leak DetectionService personnel have used leak detection equip-ment for years when servicing equipment. Leakdetectors exist not only for pinpointing specificleaks, but also for monitoring an entire room on acontinual basis. There are several reasons for leakpinpointing or area monitoring, including:• conservation of refrigerant• protection of employees• detection of fugitive or small emissions• protection of equipmentLeak detectors can be placed into two broad cate-gories: leak pinpointers and area monitors. Beforepurchasing a monitor or pinpointer, several criteriashould be considered, which include sensitivity,detection limits, and selectivity.

Types of DetectorsUsing selectivity as a criterion, leak detectors canbe placed into one of three categories: nonselective,halogen selective, or compound specific. In general,as the specificity of the monitor increases, so willthe complexity and cost.A different technology that can be employed tofind leaks is by using a dye or other additive thatis placed in the refrigeration system and is emittedwith the leaking refrigerant and lubricant.A detailed discussion of leak detection, along witha list of manufacturers of leak detection equipment,can be found in DuPont bulletin ARTD-27.

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Nonselective DetectorsNonselective detectors are those which will detectany type of emission or vapor present, regardlessof its chemical composition. These detectors aretypically quite simple to use, very rugged, inexpen-sive, and almost always portable. However, theirinability to be calibrated, long-term drift, lack ofselectivity, and lack of sensitivity limit their usefor area monitoring.Some nonselective detectors designed for use withR-502 may have a much lower sensitivity whenused with Suva® HP refrigerants. However, newlydesigned detectors with good sensitivity for HFCsare now available. Be sure to consult with themanufacturer before selecting or using a nonselec-tive detector with Suva® HP refrigerants.

Halogen-Selective DetectorsHalogen-selective detectors use a specialized sen-sor that allows the monitor to detect compoundscontaining fluorine, chlorine, bromine, and iodinewithout interference from other species. The majoradvantage of such a detector is a reduction in thenumber of nuisance alarms—false alarms caused bythe presence of some compound in the areaother than the target compound.These detectors are typically easy to use, featurehigher sensitivity than the nonselective detectors(detection limits are typically <5 ppm when usedas an area monitor and <1.4 g/yr [<0.05 oz/yr]when used as a leak pinpointer) and are verydurable. In addition, due to the partial specificityof the detector, these instruments can be easilycalibrated.

Compound-Specific DetectorsThe most complex detectors, which are also themost expensive, are compound-specific detectors.These units are typically capable of detecting thepresence of a single compound without interferencefrom other compounds.

With Suva® HP refrigerants, using compound-specific detectors may be difficult because thedifferent mixtures often contain similar types ofcompounds. In an area where different refrigerantmixtures are used, these detectors may offer morespecificity than is needed for normal leak manage-ment. Discuss these issues with the equipmentmanufacturers before making a purchase decision.

Fluorescent AdditivesFluorescent additives have been used in refrigera-tion systems for several years. These additives,invisible under ordinary lighting, but visible underultraviolet (UV) light, are used to pinpoint leaks insystems. The additives are typically placed into therefrigeration lubricant when the system is servicedor charged. Leaks are detected by using a UV lightto search for additive that has escaped from thesystem.Recent innovations in dye technology have allowedfluorescent additives to be used with HFCs and newrefrigerant mixtures. However, before adding addi-tives to a system, the compatibility of the specificdye with the lubricant and refrigerant should betested.

Storage and HandlingShipping Containers in the U.S.Suva® HP refrigerants are liquefied compressedgases. According to the U.S. Department of Trans-portation (DOT) a nonflammable compressed gasis defined as a nonflammable material having anabsolute pressure greater than 40 psia at 21°C(70°F) and/or an absolute pressure greater than104 psia at 54°C (130°F). See Table 7 for theappropriate DOT designation.

Table 7DOT Designations

DOT Proper Shipping Name (HP80/81) Compressed Gas N.O.S. (ContainsPentafluoroethane and Chlorodifluoromethane)

[404A (HP62)] Compressed Gas N.O.S. (ContainsPentafluoroethane and Trifluoroethane)

Hazard Class (All) Nonflammable Gas

DOT/IMO Hazard Class (HP80/81) 2

[404A (HP62)] 2.2

UN/NA Number (All) UN 3163

DOT Labels (All) Nonflammable Gas

DOT Placard (All) Nonflammable Gas

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A list of the different types of containers that canbe used to ship Suva® HP refrigerants in the UnitedStates, along with their water capacities, dimen-sions, DOT specifications, and net weights, areprovided in Table 8. All pressure relief devicesused on the containers must be in compliance withthe corresponding Compressed Gas Association(CGA) Standards for compressed gas cylinders,cargo, and portable tanks.The 15-lb, 30-lb, and 123-lb cylinders designed forrefrigerant applications will be painted the colorsshown in Table 8, with labels that bear the nameof the product in the same color. For clarification,the colors are:Suva® HP80 PMS 461 Light brownSuva® HP81 PMS 385 Green brownSuva® 404A (HP62) PMS 021 OrangeDisposable cylinders, known as a Dispos-A-Can®

(or DAC), fit into a box with the measurementsgiven in Table 8. When used to ship Suva® HPrefrigerants to the stationary refrigeration market,the cylinders will have the same outlet fittings ascylinders of R-502.The 123-lb cylinders are equipped with a nonrefill-able liquid vapor CGA-660 valve. With this two-way valve, refrigerant can be removed from thecylinder as either vapor or liquid, without invertingthe cylinder. The vapor valve handwheel is locatedon the top of the valve assembly. The liquidhandwheel is on the side of the valve and attachedto a dip tube extending to the bottom of the cylin-der. Each is clearly identified as vapor or liquid.

The 4,400-gal cylinder is known as an ISO tank.The dimensions referenced in Table 8 represent theframe in which the container is shipped. The tankitself has the same length of 20 ft and an outsidediameter of approximately 86 in. ISO tanks areused for export shipments of refrigerants from theUnited States.The general construction of a one-ton returnablecontainer is shown in Figure 7. Note that one endof the container is fitted with two valves. When thecontainer is turned so that the valves are lined upvertically, the top valve will discharge vapor andthe bottom valve will discharge liquid. The valvesare protected by a dome cover. The valves are Su-perior Type 660-X1-B1.One-ton containers are equipped with two fusibleplugs in each end. The fusible metal in the plugsis designed to start melting at 69°C (157°F) andcompletely melt at 74°C (165°F). Containersshould never be heated to temperatures higher than52°C (125°F). One spring-loaded pressure reliefvalve is also located in each end of the container.

Bulk Storage SystemsDuPont sells storage systems, at cost, to their re-frigeration customers. The systems are prefabri-cated, tested, and ready to install on site. The unitsare designed to optimize economy, efficiencyand safety in the storage and dispensing of DuPontrefrigerants. The delivered systems include allcomponents, such as storage tank, pumps, piping,valves, motors, and instrumentation as an integratedunit. All systems are equipped with dual pumpsto provide an installed spare. The units are skid-mounted and require only placement on a con-crete pad and connection to electrical and processsystems.

Table 8Specifications of Shipping Containers for DuPont™ Suva® HP Refrigerants

Container Dimensions DOT Spec. Net Weight (lb) Color Code

15 lb Dispos-A-Can®* 7.5" x 7.5" x 14.5" 39 (HP81 Only) 13 PMS 385

30 lb Dispos-A-Can® 10" x 10" x 17" 39 (HP80) 27 PMS 461[404A (HP62)] 24 PMS 021

123 lb Cylinder 55" H x 10" OD 4BA300 (HP81) 110[404A (HP62)] 100

4BA400 (HP80) 110

1,682 lb ton Cylinder 82" L x 30" OD 110A500W

5,000 gal Tank Truck MC-330 or -331 40,000

4,400 gal ISO 8' x 8.5' x 20' (frame) 51

170,000 lb Rail Car 114A340W

* Dispos-A-Can is a registered trademark of the DuPont Company.

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A typical bulk storage system is shown in Figure 8.Your DuPont marketing representative can arrangefor guidance on site selection, purchase, installa-tion, start-up, and maintenance.

Converting Bulk Storage Tanks fromR-502 to Suva® HP RefrigerantsBefore switching any R-502 storage system toSuva® HP refrigerants, the existing storage equip-ment must be checked to verify that it is adequate.Storage tanks built to the specifications of theAmerican Society of Mechanical Engineers(ASME) Pressure Vessel Code are required to havea metal nameplate indicating each tank’s maximumallowable working pressure (MAWP). This ratingmust be 320 psig or higher for use with all Suva®

HP refrigerants. In addition, the set pressure of thetank relief device must also be checked andchanged if necessary. This relief setting cannot behigher than the maximum working pressure listedon the nameplate, however.We recommend that storage tanks be completelyemptied of all R-502 liquid and vapor before intro-ducing the HP refrigerant. In general, converting astorage tank to HP refrigerant requires:1. Removing all R-502 from the storage tank,

lines, and equipment.2. Evacuating the storage tank to 25–29 in of

vacuum and purging with compressed drynitrogen gas.

3. Making necessary repairs to the tank afterinitial evacuation and purging.

4. Repeating step 2 until R-502 and moisturelevels are within acceptable limits.

5. Refilling the system with Suva® HP refrigerant.

This is a simplified outline of what is actually alengthy procedure. Your DuPont marketing repre-sentative can assist in obtaining the equipment,instrumentation, and technical assistance to safelyand effectively make the conversion.

Material Compatibility ConcernsMost metal components suitable for use with R-502are also compatible with Suva® HP refrigerants.These include standard grades of carbon steel,aluminum, and copper. Some elastomeric or non-metallic components suitable for R-502 may not beadequate with the new refrigerants. Therefore, allelastomeric or nonmetallic components throughoutthe system must be identified and their compatibil-ity with Suva® HP refrigerants verified. For com-plete reliability, any component that cannot beproperly identified should be replaced.In a fluorocarbon storage system, elastomers aremost commonly found in:• Packing and seats of manual valves• Pressure relief device seats• Flange and manway gaskets• Mechanical pump seals• Wet-end pump gaskets and O-rings• Filter O-rings• Sight-glass gaskets• Back-pressure regulator diaphragms and O-rings

Handling Precautions for Suva ® HPRefrigerant Shipping ContainersThe following rules for handling HP refrigerantcontainers are strongly recommended:• Use personal protective equipment such as side

shield safety glasses, gloves, and safety shoeswhen handling refrigerant containers.

Figure 7. One-Ton Returnable Container

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• Avoid skin contact with refrigerants, as theymay cause frostbite.

• Never heat a container to temperatures higherthan 52°C (125°F).

• Never apply direct flame or live steam to acontainer or valve.

• Never refill disposable cylinders with anything.The shipment of refilled disposable cylinders isprohibited by DOT regulations.

• Never refill returnable cylinders without DuPontconsent. DOT regulations forbid transportationof returnable cylinders refilled without DuPontauthorization.

• Never use a lifting magnet or sling (rope orchain) when handling containers. A crane maybe used when a safe cradle or platform is usedto hold the container.

• Never use containers as rollers, supports, or forany purpose other than to carry refrigerant.

• Protect containers from any object that will resultin a cut or other abrasion in the surface of themetal.

• Never tamper with the safety devices in thevalves or containers.

• Never attempt to repair or alter containers orvalves.

• Never force connections that do not fit. Makesure the threads on the regulators or other auxil-iary equipment are the same as those on thecontainer valve outlets.

• Keep valves tightly closed and valve caps andhoods in place when the containers are not in use.

• Store containers under a roof to protect themfrom weather extremes.

• Use a vapor recovery system to collect refrigerantvapors from lines after unloading.

Recovery, Recycle,Reclamation and DisposalResponsible use of Suva® HP refrigerants requiresthat the product be recovered for re-use or disposalwhenever possible. DuPont purchases used refrig-erant for reclamation through its distributor net-works in the United States, Canada and Europe.In the United States, all Suva® HP products willbe accepted as part of this program. Recovery andre-use of refrigerant makes sense from an environ-mental and economic standpoint. In addition, theU.S. Clean Air Act prohibits known venting ofCFC, HCFC, and HFC refrigerants during themaintenance, servicing or disposal of refrigerationequipment.

Figure 8. Typical Bulk Storage System

Filter

To Service

Check Valve

1" P

ipe

BackPressureRegulator

Pump Motor

2" Pipe

Ball Valve

Thermometer

Tank

Flow Indicator

Liquid LevelGauge

PressureGauge

Internal SafetyRelief Valves

Manway

Relief Valves

VaporEqualizing

Line

Liquid Fill Line

Excess Flow Valves

Flange

FEED System

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RecoveryRecovery refers to the removal of refrigerant fromequipment and collection in an appropriate con-tainer. As defined by the Air Conditioning andRefrigeration Institute (ARI), recovery does notinvolve processing or analysis of the refrigerants.Suva® HP refrigerants may be recovered from re-frigeration equipment using permanent on-siteequipment or many of the portable recovery devicesnow available in the marketplace. The portabledevices contain a small compressor and an air-cooled condenser, and may be used for vapor (andin some cases, liquid) recovery. At the end of therecovery cycle, the system is evacuated thoroughlyto remove vapors. In the United States, the Environ-mental Protection Agency (EPA) sets standards forrecovery equipment. Before purchasing a specificrecovery unit, check with the manufacturer to besure that it contains proper materials of construc-tion and lubricant for the refrigerants you intend torecover.Due to the fact that Suva® HP products are notazeotropes, it is important that all refrigerant isremoved from a system during recovery or recycle.It is always recommended that refrigerant transfersbe made liquid phase whenever possible to mini-mize composition changes in the products.

RecycleRefrigerant recycle refers to reducing the contami-nant levels in used refrigerants by passing the re-frigerants through devices that separate out orreduce the amount of lubricant, water, acidity andparticulates. Recycle is usually a field or shop pro-cedure with no analytical testing of refrigerant.Suva® HP refrigerants may be recycled using manyof the devices now available. In the United States,the EPA sets standards for these devices. Recycle

is already standard practice in many portions ofthe commercial refrigeration industry. Consult withthe manufacturer before specifying a recycle devicefor any refrigerant.If you routinely recycle Suva® HP refrigerantsthrough several cycles, we recommend that youhave the composition of the refrigerant checkedperiodically. This will prevent loss of performancein the unlikely event that the composition hasshifted.

ReclamationReclamation refers to the reprocessing of used re-frigerant to new product specifications. Quality ofthe reclaimed product is verified by chemical analy-sis. In the United States, Suva® HP refrigerants areincluded in DuPont’s refrigerant reclamation pro-gram. Contact DuPont or one of our authorizeddistributors for further information.Reclamation offers advantages over on-site refrig-erant recycling procedures because recycling sys-tems cannot guarantee complete removal of allcontaminants. Putting refrigerants that do not meetnew product specifications into expensive equip-ment may cause damage.

DisposalDisposal refers to the destruction of used refriger-ant. Disposal may be necessary when the refriger-ant has become badly contaminated with otherproducts and no longer meets the acceptance speci-fications of DuPont or other reclaimers. AlthoughDuPont does not presently accept severely contami-nated refrigerant for disposal, licensed waste dis-posal firms are available. Be sure to check thequalifications of any firm before sending themused refrigerants.

(7/04) 235091D Printed in U.S.A.[Replaces: H-47122-4]Reorder No.: H-47122-5

JapanMitsui DuPont Fluorochemicals

Co., Ltd.Chiyoda Honsha Bldg.5-18, 1-Chome SarugakuchoChiyoda-Ku, Tokyo 101-0064 Japan81-3-5281-5805

AsiaDuPont TaiwanP.O. Box 81-777Taipei, Taiwan886-2-514-4400

DuPont China LimitedP.O. Box TST 988511122 New World Office Bldg.(East Wing)Tsim Sha TsuiKowloon, Hong KongPhone: 852-734-5398Fax: 852-236-83516

DuPont Thailand Ltd.9-11 Floor, Yada Bldg.56 Silom RoadSuriyawongse, BankrakBangkok 10500Phone: 66-2-238-0026Fax: 66-2-238-4396

DuPont China Ltd.Rm. 1704, Union Bldg.100 Yenan Rd. EastShanghai, PR China 200 002Phone: 86-21-328-3738Telex: 33448 DCLSH CNFax: 86-21-320-2304

EuropeDuPont de NemoursInternational S.A.2 Chemin du PavillonP.O. Box 50CH-1218 Le Grand-SaconnexGeneva, Switzerland41-22-717-5111

CanadaDuPont Canada, Inc.P.O. Box 2200, StreetsvilleMississauga, Ontario

CanadaL5M 2H3(905) 821-3300

MexicoDuPont, S.A. de C.V.Homero 206Col. Chapultepec MoralesC.P. 11570 Mexico, D.F.52-5-722-1100

South AmericaDuPont do Brasil S.A.Alameda Itapecuru, 506Alphaville 06454-080 BarueriSão Paulo, Brazil55-11-7266-8263

DuPont Argentina S.A.Casilla Correo 1888Correo Central1000 Buenos Aires, Argentina54-1-311-8167

PacificDuPont AustraliaP.O. Box 930North Sydney, NSW 2060Australia61-2-99236111

DuPont Far East Inc.6th Floor Bangunan SamudraNo. 1 JLN. Kontraktor U1/14, SEK U1Hicom-Glenmarie Industrial Park40150 Shah Alam, Selangor MalaysiaPhone 60-3-517-2534

DuPont Korea Inc.4/5th Floor, Asia Tower#726, Yeoksam-dong, Kangnam-kuSeoul, 135-082, Korea82-2-721-5114

DuPont Singapore Pte. Ltd.1 Maritime Square #07 01World Trade CentreSingapore 040965-273-2244

DuPont Far East, Philippines8th Floor, Solid Bank Bldg.777 Paseo de RoxasMakati, Metro ManilaPhilippinesPhone: 63-2-818-9911Fax: 63-2-818-9659

DuPont Far East Inc.7A Murray’s Gate RoadAlwarpetMadras, 600 018, India91-44-454-029

DuPont Far East Inc.—Pakistan9 Khayaban-E-ShaheenDefence Phase 5Karachi, Pakistan 92-21-533-350

DuPont Far East Inc.P.O. Box 2553/JktJakarta 10001, Indonesia62-21-517-800

The information contained herein is based on technical data and tests which we believe to be reliable and is intended for use by persons having technicalskill, at their own discretion and risk. Because conditions of use are outside of DuPont control, we can assume no liability for results obtained or damagesincurred through the application of the data presented.

For Further Information:DuPont FluorochemicalsWilmington, DE 19880-0711(800) 235-SUVAwww.suva.dupont.com

© 2004. E. I. du PONT de NEMOURS AND COMPANY. ALL RIGHTS RESERVED.

NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BYANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING, OR OTHERWISE WITHOUT THE PRIOR WRITTEN PERMIS-SION OF DUPONT.