Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
Non-Metallic Gaskets
A “Soft Gasket” material is a term used when referring to a gasket material that is
easily compressed under a low bolt load. This term has been used to distinguish the
difference from a metallic gasket. A soft gasket material can be selected from a large
variety of elastomers, compressed non-asbestos, PTFE, flexible graphite and high
temperature sheet products. Soft gaskets are used in a wide range of applications such
as for pipe flanges, heat exchangers, compressors and bonnet valves, to name just a
few. Soft gasket material can be purchased in a variety of cut shapes or be provided in
sheet or rolls
Types
1- Compressed Non-Asbestos Sheet
2- Tanged Graphite Sheet
3- Rubber Sheet
4- PTFE Sheet
5- Envelope Gasket (PTFE with Nin-Asbestos)
Compressed Non-Asbestos Sheet
Most manufacturers of non-asbestos sheet materials use synthetic fibers, like aramid
or Kevlar, in conjunction with an elastomeric binder. The elastomeric binder makes
up a larger percentage of this sheet and thereby becomes a more important
consideration when determining applications
.
1- NON ASBESTOS GASKET JOINTING SHEET STYLE 01
Suitable for water/oil resistant gasket material for light to medium loading. Suitable
for low operating pressure, e.g. transformers, compressors and also used for
easily deformable components with low surface pressure like valve covers and
pans in internal combustion engines.
General Data
Material Composition(Type of fiber ) Aramid Fiber,
Mineral Fiber
Binders NBR
Operating Condition:
Max.Peak Temp 300°C
Max. Continuous Temp 220°C
Max.Continuous Temp. with steam160°C
Max. Operating Pressure 80 Kg/cm2
Specified Value Unit Test Method Properties S.NO
1.70 - 2.00 gm/cm3 DENSITY 1
TENSILE STRENGTH 2
> 8 N/mm2 (a) ACC to ASTM F152(ACROSS
GRAIN)
> 5 N/mm2 (b) ACC to DIN52910 (ACROSS
GRAIN)
5 – 15 % ASTM F36A COMPRESSIBILITY 3
> 50 % ASTM F36A RECOVERY 4
ASTM F 146 FLUID ABSORPTION 5
(a) IN ASTM OIL NO. 3
< 15 % NCREASE IN MASS
< 10 % INCREASE IN THICKNESS
ASTM F 146 (b) IN FUEL B
< 10 % INCREASE IN MASS
< 10 % INCREASE IN THICKNESS
ASTM F 146 (c) IN WATER/ANTIFREEZE
< 15 % INCREASE IN MASS
< 15 % INCREASE IN THICKNESS
< 35 % DIN 52911 IGNITION LOSS 6
< 1.0 cm /min. DIN 3535 SEALABILITY AGAINST Nitrogen 7
STRESS RESISTANCE 8
N/mm2 DIN 52913 16h 300 C
N/mm2 DIN 52913 16h 175 C
From 1.5 to 6 mm Thickness < 1mm = ± 0.10 mm
> 1mm = ± 10% Thickness Tolerance
± 50 mm Length
± 50 mm Width
2- STEEL NON ASBESTOS GASKET JOINTING SHEET STYLE 02
Suitable for oil resistant gasket material for light to medium loading. Suitable for
low operating pressure, e.g. transformers, compressors and also used for easily
deformable components with low surface pressure like valve covers and oil pans in
internal combustion engines.
General Data
Material Composition (Type of fiber) Aramid Fiber . Mineral Fiber
with metal gauge center
Binders NBR
Operating Condition:
Max.Peak Temp 300°C
Max. Continuous Temp 220°C
Max.Continuous Temp.with steam 160°C
Max. Operating Pressure 100 Kg/cm2
Specified Value Unit Test Method Properties S.NO
1.70 - 2.00 gm/cm3 DENSITY 1
TENSILE STRENGTH 2
> 8 N/mm2 (a) ACC to ASTM F152(ACROSS
GRAIN)
> 5 N/mm2 (b) ACC to DIN52910 (ACROSS
GRAIN)
5 – 15 % ASTM F36A COMPRESSIBILITY 3
> 50 % ASTM F36A RECOVERY 4
ASTM F 146 FLUID ABSORPTION 5
(a) IN ASTM OIL NO. 3
< 15 % NCREASE IN MASS
< 10 % INCREASE IN THICKNESS
ASTM F 146 (b) IN FUEL B
< 10 % INCREASE IN MASS
< 10 % INCREASE IN THICKNESS
ASTM F 146 (c) IN WATER/ANTIFREEZE
< 15 % INCREASE IN MASS
< 15 % INCREASE IN THICKNESS
< 32 % DIN 52911 IGNITION LOSS 6
< 1.0 cm /min. DIN 3535 SEALABILITY AGAINST Nitrogen 7
STRESS RESISTANCE 8
N/mm2 DIN 52913 16h 300 C
N/mm2 DIN 52913 16h 175 C
From 1.5 to 6 mm Thickness < 1mm = ± 0.10 mm
> 1mm = ± 10% Thickness Tolerance
± 50 mm Length
± 50 mm Width
3- NON ASBESTOS GASKET JOINTING SHEET STYLE 03
Suitable for high performance, oil resistant gasket material with excellent thermal,
chemical & mechanical properties. Suitable for compressors, pipelines,
transmission, gas meters and internal combustion engines, pipe unions & pumps
etc.
General Data
Material Composition (Type of fiber) Aramid Fiber, Mineral
Fiber
Binders High quality NBR
Operating Condition:
Max.Peak Temp 400°C
Max. Continuous Temp 270°C
Max.Continuous Temp.with steam 240°C
Max. Operating Pressure 150 Kg/cm2
Specified Value Unit Test Method Properties S.NO
1.70 - 2.00 gm/cm3 DENSITY 1
TENSILE STRENGTH 2
>14 N/mm2 (a) ACC to ASTM F152(ACROSS
GRAIN)
>11 N/mm2 (b) ACC to DIN52910 (ACROSS
GRAIN)
5 – 15 % ASTM F36A COMPRESSIBILITY 3
> 50 % ASTM F36A RECOVERY 4
ASTM F 146 FLUID ABSORPTION 5
(a) IN ASTM OIL NO. 3
<10 % NCREASE IN MASS
<8 % INCREASE IN THICKNESS
ASTM F 146 (b) IN FUEL B
< 10 % INCREASE IN MASS
<7 % INCREASE IN THICKNESS
ASTM F 146 (c) IN WATER/ANTIFREEZE
< 15 % INCREASE IN MASS
<7 % INCREASE IN THICKNESS
<30 % DIN 52911 IGNITION LOSS 6
<0.5 cm /min. DIN 3535 SEALABILITY AGAINST Nitrogen 7
STRESS RESISTANCE 8
~ 20 N/mm2 DIN 52913 16h 300 C
~ 30 N/mm2 DIN 52913 16h 175 C
From 1.5 to 6 mm Thickness < 1mm = ± 0.10 mm
> 1mm = ± 10% Thickness Tolerance
± 50 mm Length ± 50 mm Width
Tanged Graphite Sheet
Tanged graphite gaskets range of graphite sheet sealing materials are manufactured
from highly pure exfoliated graphite flake, with/without a reinforcing metallic core
316L with the standard product offering graphite with a carbon content of 98% whiles
for nuclear purposes its 99.85%.
Tanged graphite gasket laminates by Arabian Broz Gasket are suitable for moderately
high temperature/high pressure gasket applications with a wide range of media. Using
mechanical means or certain adhesives, graphite foils can be attached to the
reinforcing core.
Dimensions of standard sheets: Thickness: 1.5, 2.0 and 3.0mm (2mm available on request)
Tolerances: Thickness: <1mm = ± 0.1mm, 1mm = ± 10%, Length: ± 50mm, Width: ± 50mm
Compressibility ASTM F36 30%
Recovery ASTM F36 23%
Tensile Strength ASTM F152 34.5
N/mm2
Creep Relaxation ASTM F38B 10%
Gas Permeability DIN 3535/4 0.4 ml/min
Maximum Operating Conditions
Peak Temperature 500°C (650°C in steam)
Minimum Temperature -200°C
Pressure
140 bar
P x T, Max 25000
Rubber Sheet
Rubber is a soft gasket material. A wide range of elastomers can be used, such
as neoprene, nitrile, EPDM and natural rubber. Rubber gaskets are used in a wide range of
applications such as pipe gaskets, heat exchangers, and many ways.
EPDM, (Ethylene Propylene-Diene Monomer):
This polymer has superior resistance to ozone, heat and sunlight applications. It
has good resistance to water and steam EPDM is available in black, white (FDA) and
purple. It is sulphur and peroxide curable
Resistant to: Animal and vegetable oils, ozone, strong and oxidizing chemicals.
Poor resistance to petroleum based fluids
Attacked by: Mineral oils and solvents, aromatic hydrocarbons
Color Black
Size 1mm,3mm,5mm
Hardness 75 ± 5Shore A
Tensile Strength / Elongation Min, 3MPA, Min 200%
Temperature Range -45ºC to 120 ºC
Surface Smooth
Natural Rubber, (NR) (Pure Gum Amber):
It is a natural product extracted from tropical plants. It has excellent flexibility,
tensile elongation & abrasion resistant.
Resistant to: Most moderate chemicals, wet or dry, organic acids, alcohols, ketones,
aldehydes
Poor resistance to petroleum based fluids.
Attacked by: Ozone, strong acids, fats, oils, greases, most hydrocarbons
Color Black
Size 1mm,3mm,5mm
Hardness 65 ± 5Shore A
Tensile Strength / Elongation Min, 10MPA, Min 500%
Temperature Range -50ºC to 90 ºC
Surface Smooth
Neoprene®
(Chloroprene) (CR):
is a synthetic polymer that offers Good weathering resistance. Flame retarding.
Moderate resistance to petroleum based fluids
Resistant to: Moderate chemicals and acids, ozone, oils, fats, grease, many oils, and
solvents
Moderate resistance to petroleum based fluids
Attacked by: Ozone, strong acids, fats, oils, greases, most hydrocarbons
Color Black
Size 1mm,3mm,5mm
Hardness 75 ± 5Shore A
Tensile Strength / Elongation Min, 10MPA, Min 200%
Temperature Range -35ºC to 125 ºC
Surface Smooth
Silicone(SI)(Polysiloxane):
has high temperature properties as well as excellent tensile strength, compression set
and is a fungus resistance material. It has good resistance against many chemicals,
including acids, oxidizing chemicals & ammonia. Available in red, grey, white(FDA)
orblack.excellent high and low temperature properties
Resistant to: Moderate or oxidizing chemicals, ozone, concentrated sodium
hydroxide
Attacked by: Many solvents, oils, concentrated acids, dilute sodium hydroxide
Color Black
Size 1mm,3mm,5mm
Hardness 75 ± 5Shore A
Tensile Strength / Elongation Min, 10MPA, Min 300%
Temperature Range -70ºC to 200 ºC
Surface Smooth
Nitrile (Buna-N) (NBR):
is an elastomer that has superior resistance to petroleum based hydraulic fluids,
alkalis, acids, aliphatic and aromatic hydro carbonates, animal & vegetable oils
Resistant to: Many hydrocarbons, fats, oils, greases, hydraulic fluids, chemicals
Attacked by: Ozone (except PVC blends), ketones, esters, aldehydes, chlorinated and
nitro hydrocarbons
Color Black
Size 1mm,3mm,5mm
Hardness 75 ± 5Shore A
Tensile Strength / Elongation Min, 10MPA, Min 200%
Temperature Range -35ºC to 125 ºC
Surface Smooth
Cloth Inserted Rubber
Composition: Neoprene or SBR
General Properties: Excellent physical properties
Temperature Range: Neoprene -20°F to +180°F; SBR -20°F to +170°F
Cloth Inserted (CI) Rubber is a rubber sheet material that has been reinforced with
one or more plies of cloth or duck such as polyester, nylon, cotton or fiberglass fabric.
This reinforcement gives added stability in flanged gasket applications requiring
mechanical fastening and reduces creep when there are high compression loads. Our
gasket material inventory includes cloth inserted Neoprene and SBR Red Rubber and
Nitrile (Buna-N) Sheet.
A-Cloth Inserted Neoprene Rubber Sheet is suitable in applications requiring
minimal oil resistance and where hot and/or cold water and gases are being
transferred. Such applications might include meters, control devices, regulators,
pumps and diaphragms.
Polymer: Chloroprene reinforced with 3.4 oz/sq. yd. nylon fabric
hardness 60 ± 5 Shore A
Temperature Range
-20°F to +180 °F
Tensile Strength 1100 PSI
Finish Plate
Gauge (thickness) 1.5mm, 3mm, 5mm,6mm
Oil Resistance Medium
Grades commercial black neoprene rubber
B-Cloth Inserted SBR Red Rubber Sheetis suitable for use in hydraulics and where
air, water or low pressure steam will be passed.
Polymer: Styrene-Butadiene rubber reinforced with 3.4 oz/sq. yd. nylon fabric
hardness 60 ± 5 Shore A
Temperature Range
-20°F to +170 °F
Tensile Strength 600 PSI
Finish Plate
Gauge (thickness) 1.5mm, 3mm, 5mm,6mm
Oil Resistance Medium
Grades commercial black SBR rubber
C-Cloth Inserted NBR Nitrile (Buna-N)is suitable for applications needing
resistance to oil, caustics, and aliphatic hydrocarbons.
Polymer: Butadiene and Acrylonitrile
hardness 60± 5 Shore A
Temperature Range
-20°F to +170 °F
Tensile Strength 800 PSI
Finish Plate
Gauge (thickness) 1.5mm, 3mm, 5mm,6mm
oil resistance High
Grades Commercial
PTFE SHEET
PTFE is totally unique. It has excellent resistance to most mineral and organic
chemicals such as acids, bases, and solvents, and can be used up to approximately
260⁰C.
PTFE is generally used in the presence of aggressive chemicals. It can be supplied as
a bore liner to shield pipe gaskets from chemical attack: these are supplied to fit
specific bore sizes, and are known as PTFE envelopes.
PTFE has the same co-efficient friction as ice on ice, so it is an exceptionally non-
stick material. More information about PTFE can be found in the following guide to
PTFE.
FEATURES AND BENEFITS
Tight seal
Improved performance over conventional PTFE
Reduced product loss and emissions
Reduced creep relaxation
Unique manufacturing process minimizes cold flow problems typical of
skived and expanded PTFE sheets
Excellent bolt torque retention
Withstands a wide range of chemicals for extended service life in a wide
variety of applications
Offers some of the largest sheet sizes in the industry
Improved material utilization reduces waste
Branding and color coding reduces misapplication
Will not burn
Will not support bacterial growth
PTFE TYPES :
Expanded PTFE sheet
is much softer and more flexible than regular PTFE and thus conforms easily to irregular
and rough surfaces. The material is easier to compress and minimizes creep and cold
flow. Conforms to FDA regulations..
Temperature Minimum : -450 °F
Maximum : 500 °F
Color White
Tensile strength 2900 psi 2900 psi
PH 0-14
Density 0.9 g/cm3
Thickness 1.5 – 6 mm
PTFE Film (virgin solid sheet)
Virgin PTFE contains no fillers and has almost universal chemical
resistance. It has excellent insulating capabilities and high dielectric
properties. Its high temperature stability allows for continuous use at 260°C. Virgin
PTFE has excellent low friction, non-stick and releaseproperties.
Temperature Minimum : -328 °F
Maximum : 500 °F
Color White
Tensile strength 1500-2400psi
PH 0-14
Density 2.15 g/cm3
Thickness 1.5 – 6 mm
Reinforced PTFE with silica filler
resistant to: Strong acids (except hydrofluoric), solvents, hydrocarbons, water, steam, chlorine, and cryogenics. Conforms to FDA regulations.
Reinforced PTFE with glass microspheres filler
resistant to: Moderate concentrations of acids and some caustics, hydrocarbons, solvents,
water, refrigerants, and cryogenics. Conforms to FDA regulations. Glass has little effect on most of the electrical properties of PTFE.
Reinforced PTFE with barium sulfate filler
resistant to: Strong caustics, moderate acids, chlorine, gases, water, steam, hydrocarbons, and aluminum fluoride Conforms to FDA regulations.
.
PTFE ENVELOPE GASKET
A PTFE envelope gasket is a composed gasket. The product consists of an envelope of
PTFE with an inlay. The envelope gasket is mainly applied as a flange gasket in
applications where a high chemicaland high pressure resistance is required.
PROPERTIES OF A PTFE ENVELOPE GASKET
Envelope gaskets have the chemical resistance of PTFE, but the strength and resilience of the
inlay material. PTFE envelope gaskets combine the benefits of different materials:
Good chemical resistance.
Wide temperature range. This depends both on the envelope as the inlay material.
Good pressure resistance, depending on the choice of the inlay material.
APPLICATIONS OF THE PTFE ENVELOPE GASKET
In a chemical aggressive environment, where pollution of the medium is not allowed, it is
complicated to apply a standard gasket. Here PTFE envelope gaskets are applied as flange
gaskets. For example, in the (petro) chemical industry and in the process industry.
The envelope gaskets are also ideal for application in the food industry. PTFE is
physiologically inert and may be used in direct contact with food (FDA).
MATERIAL POSSIBILITIES
The composition of the PTFE envelope gasket depends on the application. Non-asbestos
gasket sheets (high-pressure) and various rubber grades are amongst others applied as inlay
material. For applications where a high mechanical strength at elevated temperatures is
required
.Specification
Temperature: -100~260oC
Max. Pressure: 50bar
Dimensions for Cut Gaskets
Dimensions to suit ANSI Standard Flanges
ASME B16.21 Class 150
ASME B16.21 Class 300
ASME B16.47 B Class 300
ASME B16.47 B Class 600 (continued)
Dimensions to suit DIN Standard Flanges
PN10