2571-85
2571 is a high durometer silver-plated copper filled conductive silicone elastomer with a Shore A hardness of 85, meeting the requirements of MIL-DTL-83528 Type K and listed on the M83528 Qualified Product List (QPL), Notification of Qualification VQH-21-036470. 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® 1212. Volume resistivity is 0.0006 ohm-cm per MIL-DTL-83528 — the lowest volume resistivity in this product group — and tensile strength is 550 psi, the highest in the group.
Key Properties
- Hardness Shore A: 85 (ASTM D2240)
- Tensile Strength: 550 psi (ASTM D412)
- Elongation: 120% (ASTM D412)
- Volume Resistivity: 0.0006 ohm-cm (MIL-DTL-83528)
- Specific Gravity: 3.50 (ASTM D792)
- Thermal Stability Range: -49°F to -193°F
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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 | 3.50 | ASTM D792 |
Mechanical Properties
| Property | Value | Test Method |
| Hardness Shore A | 85 | ASTM D2240 |
| Tensile Strength | 550 psi | ASTM D412 |
| Elongation | 120% | ASTM D412 |
| Tear Strength Type C | 75 ppi | ASTM D624 |
| Compression Deflection | 8.6% | MIL-DTL-83528 |
| Compression Set, 70 Hours at 212°F | 30% | ASTM D395B |
| Low Temperature Retraction, TR-10 and TR-70, °F | -95.8 / -116.6 | ASTM D1329 |
Thermal Properties
| Property | Value | Test Method |
| Thermal Stability Range | -49°F to -193°F | — |
Electrical Properties
| Property | Value | Test Method |
| Volume Resistivity | 0.0006 ohm-cm | MIL-DTL-83528 |
| Shielding Effectiveness 20 MHz–10 GHz (E-Field) | >140 dB | MIL-DTL-83528 |
| Electrical Stability After Break | 0.002 ohm-cm | MIL-DTL-83528 |
| Volume Resistivity After EMP | 0.004 ohm-cm | MIL-DTL-83528 |
| Electrical Stability During and After Vibration | 0.002/0.001 ohm-cm | MIL-DTL-83528 |
| Volume Resistivity After Life Testing (1000 hrs) | 0.0008 ohm-cm max | MIL-DTL-83528 |
Compliance
- MIL-DTL-83528 — Compliant (Type K)
- M83528 Qualified Product List (QPL) — Listed (Defense Logistics Agency), VQH-21-036470
- EMI/RFI shielding gaskets for military-grade electronic enclosures and avionics systems requiring maximum mechanical rigidity and lowest volume resistivity
- Conductive elastomeric seals for RF shielding in radar, communication, and satellite systems where high hardness supports precise gasket geometry retention
- Grounding and shielding for connectors, flanges, and panel-to-chassis interfaces in defense applications requiring the highest tensile and tear resistance
- Sealing and shielding in high-reliability aerospace, naval, and missile systems
- Drop-in replacement for Parker Chomerics CHO-SEAL® 1212 in QPL-specified assemblies
Common industries: Defense, aerospace, naval, military electronics, avionics, radar and communications systems.
2571 is a high durometer silver-plated copper filled conductive silicone elastomer designed to meet MIL-DTL-83528 Type K specifications. The TDS identifies it as a “high durometer” grade, and at 85 Shore A it is the firmest material in this product group. It achieves the lowest volume resistivity (0.0006 ohm-cm) and the highest tensile strength (550 psi) across the 2486/2569/2571/2573 series.
It is QPL-listed under Notification of Qualification VQH-21-036470, Made in the USA, and is a direct replacement for Parker Chomerics CHO-SEAL® 1212 material. The specific gravity of 3.50 reflects the silver-plated copper filler loading.
The material delivers 120% elongation, a Tear Strength Type C of 75 ppi (ASTM D624) — the highest tear resistance in the group — and a Compression Set at 70 hours at 212°F of 30% (ASTM D395B). Compression Deflection is 8.6% per MIL-DTL-83528. Electrical stability has been characterized through EMP survivability (0.004 ohm-cm), vibration (0.002/0.001 ohm-cm), and 1000-hour life testing (0.0008 ohm-cm max), all per MIL-DTL-83528. Thermal stability range is listed on the TDS as -49°F to -193°F.
Compliant with MIL-DTL-83528 Type K — Part of the M83528 Qualified Product List (QPL) from the Defense Logistics Agency (DLA).
What differentiates 2571 from 2486, 2569, and 2573?
2571 (MIL-DTL-83528 Type K) is the highest durometer grade in this product group at 85 Shore A, offering the lowest volume resistivity (0.0006 ohm-cm), the highest tensile strength (550 psi), and the highest Tear Strength Type C (75 ppi). It is the most mechanically rigid option and achieves >140 dB shielding effectiveness. It replaces CHO-SEAL® 1212. The 48-hour life test volume resistivity row present on 2486, 2569, and 2573 is not listed on the TDS for 2571.
Why is compression set critical for this material?
In military-grade EMI shielding gasket applications, 2571 must maintain intimate contact with mating metal surfaces throughout its service life to sustain shielding effectiveness of >140 dB and volume resistivity of 0.0006 ohm-cm per MIL-DTL-83528 Type K. Compression Set at 70 hours at 212°F is 30% (ASTM D395B), characterizing the gasket's long-term recovery behavior under sustained clamping load in thermal environments.
What is the operating temperature range for 2571?
The thermal stability range for 2571 is listed on the TDS as -49°F to -193°F.
Is 2571 suitable for military and regulated environments?
Yes. 2571 meets MIL-DTL-83528 Type K requirements and is listed on the M83528 Qualified Product List (QPL) from the Defense Logistics Agency (DLA), Notification of Qualification VQH-21-036470. It is Made in the USA.
How should 2571 be specified?
Specify grade (2571), thickness, color (Tan), MIL-DTL-83528 Type K compliance requirements, dimensional tolerances, and finished format.
