CHO-SEAL 6503 – 1.57mm | Parker ChomericsCustom pads and gaskets priced instantly and made to order within 24 hours!

CHO-SEAL 6503 – 1.57mm | Parker Chomerics

Conductive Elastomer | Nickel-Aluminium Filled Fluorosilicone

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  • Low Electrical Resistivity / High Conductivity
  • Excellent Shielding Effectiveness
  • Compression Set Resistance
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Stock sheet size: 25.4cm x 50.8cm

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SKU: 93285 Categories: , , , Brand:

Description

Parker Chomerics CHO-SEAL 6503 is a high-performance, nickel-aluminium filled conductive elastomer built on a fluorosilicone binder, engineered to deliver superior EMI/RFI shielding and environmental sealing in demanding applications. With excellent galvanic compatibility to aluminium, CHO-SEAL 6503 reduces the risk of flange corrosion while providing long-term reliability across harsh operating conditions.

Backed by Parker Chomerics’ advanced filler technology, CHO-SEAL 6503 achieves outstanding shielding performance (> 100 dB) even after rigorous environmental aging, such as salt fog exposure. Its flexible elastomer matrix ensures a reliable environmental seal under compression, resisting moisture, dust, and chemical ingress.

MPN: 40-30-1020-6503

Benefits

  • Excellent Corrosion Resistance
  • Robust Environmental Sealing
  • High EMI Shielding Stability Over Time

Features

Nickel-Aluminum Conductive Filler

  • The conductive particles are Ni/Al, which combine conductivity with corrosion robustness.

Fluorosilicone Elastomer Matrix

  • The binder is fluorosilicone, giving the gasket good chemical resistance and flexibility.

High Shielding Effectiveness

  • The material delivers very high levels of EMI attenuation — for example, shielding levels of ~110 dB at 2 GHz are quoted for certain geometries.

Recommended Uses

  • Aerospace & Defense: Used in extruded or molded gaskets for aircraft electronic bay doors, access panels, or bulkheads where both EMI shielding and environmental sealing are needed.
  • Connector Interfaces: As molded O-rings or cross-section gaskets in RF / high-reliability connectors to maintain electrical continuity and seal.
  • Harsh Industrial Electronics: Protecting enclosures in industrial systems, telecom gear, or life-science equipment that need EMI protection while exposed to chemicals, moisture or wide temperature variation.
Physical
Property Test Procedure<br>(Type of Test) CHO-SEAL 6503
Conductive Filler – Ni/Al
Elastomer Binder – Fluorosilicone
Type (Ref. MIL-DTL-83528) – Not Applicable
Volume Resistivity, ohm-cm, max.,<br>as supplied without pressure<br>sensitive adhesive <p style=”border-bottom: 1px solid black”>CEPS-0002<sup>(C)</sup> (Q/C)</p><p>MIL-DTL-83528 (Q/C)</p> <p style=”border-bottom: 1px solid black”>0.250</p><p>Not Applicable</p>
Hardness, Shore A ASTM D2240 (Q/C) 72 ± 10
Specific Gravity ASTM D792 (Q/C) 2.05 ± 0.25
Tensile Strength, psi (MPa), min. ASTM D412 (Q/C) 150 (1.03)
Elongation, % min. or % min./max ASTM D412 (Q/C) 50 min
Tear Strength, lb/in. (kN/m), min. ASTM D624 (Q) 35 (6.13)
Compression Set,<br>70 hrs at 100°C, % max.<sup>(A)</sup> ASTM D395,<br>Method B (Q) 30
Thermal
Property Test Procedure<br>(Type of Test) CHO-SEAL 6503
Low Temperature Flex TR10,<br>°C, min. ASTM D1329 (Q) -55
Maximum Continuous Use <br>Temperature, °C<sup>(B)</sup> – 125
Thermal Conductivity,<br>W/m-K (Typical) 300 psi (2.07 MPa) – 0.9
Electrical
Property Test Procedure<br>(Type of Test) CHO-SEAL 6503
<strong>Shielding Effectiveness, dB, min.<sup>(F)</sup></strong><br>- 200 kHz (H Field)<br>- 100 MHz (E Field)<br>- 500 MHz (E Field)<br>- 2 GHz (Plane Wave)<br>- 10 GHz (Plane Wave)<br>- 40 GHz (Plane Wave) <br><br>Method 2:<br>MIL-DTL-83528<br>Para. 4.5.12 (Q) <strong>Method 2:</strong><br>Not Tested<br>127<br>117<br>116<br>127<br>Not Tested
Electrical

Electrical Stability, ohm-cm, max.

Property Test Procedure<br>(Type of Test) CHO-SEAL 6503
Heat Aging <p style=”border-bottom: 1px solid black”>CEPS-0002<sup>(C)</sup> (Q)</p><p>MIL-DTL-83528<br>Para. 4.5.15 (Q/C)</p> <p style=”border-bottom: 1px solid black”>0.250<sup>(H)</sup></p><p>Not<br>Applicable</p>
Resistance During Vibration MIL-DTL-83528<br>Para. 4.5.13 (Q) Not<br>Applicable
Resistance After Vibration MIL-DTL-83528<br>Para. 4.5.13 (Q) Not<br>Applicable
Post Tensile Set Volume Resistivity MIL-DTL-83528<br>Para. 4.5.9 (Q/C) Not<br>Applicable
Regulatory
Property Test Procedure<br>(Type of Test) CHO-SEAL 6503
EMP Survivability,<br>kA per in. perimeter MIL-DTL-83528<br>Para. 4.5.16 (Q) >0.9
RoHS Compliant – Yes
UL 94 Flammability Rating UL 94 Not Tested

CHO-SEAL 6503 Datasheet





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