CHO-SEAL® 6460 is an electrically conductive molding grade environmental seal specifically formulated to lower your total cost of ownership by reducing the incidence of field repairs and maintenance. Consisting of a precise composite of nickel plated aluminum and nickel plated graphite particles dispersed within an ethylene propylene diene monomer (EPDM), CHO-SEAL 6460 provides the ideal combination of physical and electrical material performance tailored for applications involving harsh outdoor, high humidity and corrosive salt environments, including CBRNE (chemical, biological, radiological, nuclear and high yield explosive).

In addition to providing excellent resistanceto nuclear, biological and chemical decontamination fluids, CHO-SEAL 6460 has been proven to be galvanically compatible with chromate conversion coated aluminum, minimizing flange corrosion, pitting and wear over the life of the gasket. As a result, CHO-SEAL 6460 can be deployed as a standalone, chemically resistant environmental EMI seal, eliminating the need for a secondary nonconductive outboard gasket; reducing assembly time, inventory and cost. A single multipurpose seal also allows for narrower flange designs that can condense the overall package size for weight savings or increase space to accommodate other components.

In terms of mechanical performance, CHO-SEAL 6460 provides lower material hardness and compression set compared to other commercially available EMI grade EPDM materials, ensuring a long lasting environmental seal that will decrease the risk of premature repair and/or replacement as a result of contamination from harsh environments.

Product Features: EPDM Polymer System• Excellent resistance against caustics, acids,

ketones, alcohols, esters and water• Compatible with chemical, biological,

radiological, nuclear and high yield explosive (CBRNE) decontamination fluids

• Outstanding low temperature flex Nickel Plated Aluminum / Nickel Plated Graphite Particles:

• High shielding effectiveness: 80 – 120 dB• Low flange galvanic corrosion per CHO-

TM101• Particle “bite through” for use with corrosion

resistant Class 1A chromate treatments

Excellent Compression Set Resistance:

• Excellent mechanical sealing• No damage to the PCB caused by

environmental leaks• No gaps for EMI leaks• Low material hardness (65 Shore A)

Low Closure Force:

• Thinner covers• Fewer fasteners• Low weight thermoplastic housings• Greater deflection ranges• Enhanced seal properties

Lower cost for gasketing in harsh environments by eliminating:

• Outboard non-conductive gaskets• Metallic (nickel, tin or silver) plating• Complicated partial flange painting designs• Outboard enclosures

Available Product Forms

• Flat sheets, die cut parts, custom molded shapes, vulcanized covers, reinforced seals

EMI Shielding CBRNE/CorrosionResistant Gasket Material

CHO-SEAL® 6460

Contact Information:Parker Hannifin CorporationChomerics Division77 Dragon CourtWoburn, MA 01801phone 781 935 4850fax 781 933 4318chomailbox@parker.comwww.chomerics.comwww.parker.com/chomerics

Nickel Plated Aluminum (Ni/Al) / Nickel Plated Graphite (Ni/C) Filled EPDM

Customer ValueProposition:

The stable mechanical properties also guarantee the long-term integrity of the EMI seal, decreasing the need for field diagnostic inspections. The lower deflection force also minimizes design complexity by reducing the need for fasteners and allowing for thinner, lighter covers potentially decreasing the total cost of ownership of a durable EMI gasket system by 25-50% while improving field performance.

CHOMERICS and CHO-SEAL are registered trademarks of Parker Hannifin Corporation. ® 2013

www.chomerics.com www.parker.com/chomerics

ENGINEERING YOUR SUCCESS.

TB 1121 EN November 2016

Product Information - CHO-SEAL® 6460

82

8996

105109

113119

117 109115

102111 105

99 99

0

20

40

60

80

100

120

140

10 100 1,000 10,000

Atten

uatio

n (d

B)

Frequency (MHz)

Typical CHO-SEAL® 6460 Shielding Effectiveness Per MIL-DTL-83528CAttenuation (dB) vs. Frequency (MHz)

Note: Test methods are available on www.chomerics.com

Note A: Compression set is expressed as a percentage of deflection per ASTM D395 Method B, at 25% deflection. To determine percent recovery, subtract 0.25 of the stated compression set value from 100%. For example, in the case of 30% compression set, recovery is 92.5%.Note B: Where two values are shown, the first represents max. operating temp. for conformance to MIL-DTL-83528 (which requires Group A life testing at 1.25 times max. operating temp.) and the second value represents the practical limit for ex posure up to 1000 hrs. (compressed between flanges 7-10%). Single values conform to both definitions.Note C: Copies of CEPS-0002, CHO-TP08 and CHO-TP09 are available from Chomerics. Contact Applications Engineering.Note D: Heat aging condition: 100°C for 48 hrs.

Note E: Heat aging condition: 150°C for 48 hrs.Note F: It may not be inferred that the same level of shielding effectiveness provided by a gasket material tested in the fixture per MIL-DTL-83528 Para. 4.5.12 would be provided in an actual equipment flange, since many mechanical factors of the flange design (tolerances, stiffness, fastener location and size, etc.) could lower or enhance shielding effectiveness. This procedure provides data applicable only to the test fixture design of MIL-DTL-83528, but which is useful for making comparisons between different gasket materials. The 40 GHz test data for all materials uses TP08 test method.Note G: Heat aging condition: 200 °C for 48 hours Note H: Heat aging condition: 125 °C for 1000 hours

continued...Table 5-3: Material Guidelines - Military and Commercial - continuedTest Procedure (Type of Test) CHO-SEAL 6460

Phys

ical

Molded (M) or Extruded (E) -- MConductive Filler -- Ni/Al+Ni/CElastomer Binder -- EPDMType (Ref. MIL-DTL-83528)[I] -- Not Applicable

Volume Resistivity, ohm-cm, max., as supplied without pressure sensitive adhesiveCEPS-0002c (Q/C) Not Applicable

MIL-DTL-83528 (Q/C) 0.600Hardness, Shore A ASTM D2240 (Q/C) 65 ±7Specific Gravity ASTM D792 (Q/C) 1.80 ± 0.25Tensile Strength, psi (MPa), min. ASTM D412 (Q/C) 200 (1.38)Elongation, % min. or % min./max. ASTM D412 (Q/C) 200Tear Strength, lb/in. (kN/m), min. ASTM D624 (Q) 50 (8.75)Compression Set, 70 hrs at 100°C, % max. (A) ASTM D395, Method B (Q) 30

Ther

mal Low Temperature Flex TR10, °C, min. ASTM D1329 (Q) -50

Maximum Continuous Use Temperature, °C (B) -- 100Thermal Conductivity, W/m-K (Typical) 300 psi (2.07 MPa) ASTM D5470 Not Tested

Elec

tric

al

Shielding Effectiveness, dB, min. (F) Method 1: CHO-TP08C (Q)

Method 2:

MIL-DTL-83528 Para. 4.5.12 (Q)

Method 3:CHO-TP09C (Q)

Method 2 200 kHz (H Field) Not Tested 100 MHz (E Field) 110 500 MHz (E Field) 120 2 GHz (Plane Wave) 105 10 GHz (Plane Wave) 100

40 GHz (Plane Wave) Not Tested

Elec

tric

al S

tabi

lity,

ohm

-cm

, max

. Heat AgingCEPS-0002c (Q) Not Applicable

MIL-DTL-83528 Para. 4.5.15 (Q/C) 2.500D

Resistance During Vibration MIL-DTL-83528 Para. 4.5.13 (Q) Not Applicable

Resistance After Vibration MIL-DTL-83528 Para. 4.5.13 (Q) Not Applicable

Post Tensile Set Volume Resistivity MIL-DTL-83528 Para. 4.5.9 (Q/C) Not Applicable

Regu

lato

ry EMP Survivability, kA per in. perimeter MIL-DTL-83528 Para. 4.5.16 (Q) Not Applicable

RoHS Compliant -- Yes

UL 94 Flammability Rating UL 94 Not Tested