2569
2569 is a silver-plated copper filled conductive silicone elastomer with a Shore A hardness of 70, meeting the requirements of MIL-DTL-83528 Type A and listed on the M83528 Qualified Product List (QPL), Notification of Qualification VQ (VQH-21-036367). It is available in thicknesses of 1/64″, 1/32″, 1/16″, 3/32″, 1/8″, 3/16″, and 1/4″, and is identified on the TDS as a replacement for Parker Chomerics CHO-SEAL® 1215. Shielding effectiveness is >145 dB (20 MHz–10 GHz, E-field) — the highest in this series — and volume resistivity is 0.0015 ohm-cm, both per MIL-DTL-83528.
Key Properties
- Hardness Shore A: 70 (ASTM D2240)
- Tensile Strength: 390 psi (ASTM D412)
- Elongation: 150% (ASTM D412)
- Volume Resistivity: 0.0015 ohm-cm (MIL-DTL-83528)
- Specific Gravity: 3.40 (ASTM D792)
- Thermal Stability Range: -67°F to 257°F
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- Specifications
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Physical Properties
| Property | Value | Test Method |
| Thickness | 1/4″, 3/16″, 1/8″, 3/32″, 1/16″, 1/32″, 1/64″ | — |
| Color | Tan | — |
| Specific Gravity | 3.40 | ASTM D792 |
Mechanical Properties
| Property | Value | Test Method |
| Hardness Shore A | 70 | ASTM D2240 |
| Tensile Strength | 390 psi | ASTM D412 |
| Elongation | 150% | ASTM D412 |
| Tear Strength Type C | 50 ppi | ASTM D792 |
| Compression Deflection | 8.5% | MIL-DTL-83528 |
| Compression Set, 70 Hours at 212°F | 26% | ASTM D395B |
| Low Temperature Retraction, TR-10 and TR-70, °F | -94 | ASTM D1329 |
Thermal Properties
| Property | Value | Test Method |
| Thermal Stability Range | -67°F to 257°F | — |
Electrical Properties
| Property | Value | Test Method |
| Volume Resistivity | 0.0015 ohm-cm | MIL-DTL-83528 |
| Shielding Effectiveness 20 MHz–10 GHz (E-Field) | >145 dB | MIL-DTL-83528 |
| Electrical Stability After Break | 0.002 ohm-cm | MIL-DTL-83528 |
| Volume Resistivity After EMP | 0.005 ohm-cm | MIL-DTL-83528 |
| Electrical Stability During and After Vibration | 0.004/0.0009 ohm-cm | MIL-DTL-83528 |
| Volume Resistivity After Life Testing (1000 hrs) | 0.009 ohm-cm max | MIL-DTL-83528 |
| Volume Resistivity After Life Testing (48 hrs) | 0.002 ohm-cm max | MIL-DTL-83528 |
Compliance
- MIL-DTL-83528 — Compliant (Type A)
- M83528 Qualified Product List (QPL) — Listed (Defense Logistics Agency), VQ (VQH-21-036367)
- EMI/RFI shielding gaskets for military-grade electronic enclosures and avionics systems requiring maximum shielding effectiveness
- Conductive elastomeric seals for RF shielding in radar, communication, and satellite systems
- Grounding and shielding for connectors, flanges, and panel-to-chassis interfaces in defense applications
- Sealing and shielding in high-reliability aerospace, naval, and missile systems
- Drop-in replacement for Parker Chomerics CHO-SEAL® 1215 in QPL-specified assemblies
Common industries: Defense, aerospace, naval, military electronics, avionics, radar and communications systems.
2569 is a silver-plated copper filled conductive silicone elastomer designed to meet MIL-DTL-83528 Type A specifications. Type A represents the standard silver-plated copper silicone shielding elastomer in the MIL-DTL-83528 family, and 2569 achieves the highest shielding effectiveness in this product group at >145 dB (20 MHz–10 GHz, E-field).
It is QPL-listed under Notification of Qualification VQ (VQH-21-036367), Made in the USA, and is a direct replacement for Parker Chomerics CHO-SEAL® 1215 material. The specific gravity of 3.40 reflects the high density of silver-plated copper filler.
The material delivers 390 psi tensile strength, 150% elongation, and a Tear Strength Type C of 50 ppi (ASTM D792). Compression Set at 70 hours at 212°F is 26% (ASTM D395B) and Compression Deflection is 8.5% per MIL-DTL-83528. Electrical stability has been characterized through EMP survivability (0.005 ohm-cm), vibration (0.004/0.0009 ohm-cm), and life testing at 1000 hours (0.009 ohm-cm max) and 48 hours (0.002 ohm-cm max), all per MIL-DTL-83528. Thermal stability range is -67°F to 257°F.
Compliant with MIL-DTL-83528 Type A — Part of the M83528 Qualified Product List (QPL) from the Defense Logistics Agency (DLA).
What differentiates 2569 from 2486, 2571, and 2573?
2569 (MIL-DTL-83528 Type A) delivers the highest shielding effectiveness in this product group at >145 dB — surpassing 2573 (>125 dB), 2571 (>140 dB), and 2486 (>90.8 dB). It uses silver-plated copper filler in a standard silicone base, giving it a specific gravity of 3.40 — among the highest in the group. It replaces CHO-SEAL® 1215. The fluorosilicone grades (2486 and 2573) are preferred when chemical or fuel resistance is required in the base polymer.
Why is compression set critical for this material?
In military-grade EMI shielding gasket applications, 2569 must maintain intimate contact with mating metal surfaces throughout its service life to sustain shielding effectiveness of >145 dB and volume resistivity of 0.0015 ohm-cm per MIL-DTL-83528 Type A. Compression Set at 70 hours at 212°F is 26% (ASTM D395B), characterizing the gasket's long-term recovery behavior under sustained clamping load in thermal environments.
What is the operating temperature range for 2569?
The thermal stability range for 2569 is -67°F to 257°F as listed on the TDS.
Is 2569 suitable for military and regulated environments?
Yes. 2569 meets MIL-DTL-83528 Type A requirements and is listed on the M83528 Qualified Product List (QPL) from the Defense Logistics Agency (DLA), Notification of Qualification VQ (VQH-21-036367). It is Made in the USA.
How should 2569 be specified?
Specify grade (2569), thickness, color (Tan), MIL-DTL-83528 Type A compliance requirements, dimensional tolerances, and finished format.
