2529 Corrosion Resistant Silicone
2529 is a 68 durometer silicone elastomer filled with nickel-plated aluminum particles, available as fully cured electrically conductive sheet stock, continuous extrusion profiles, or as a ready-to-mold compound. It delivers shielding effectiveness of >110 dB (20 MHz–10 GHz, E-field) per MIL-DTL-83528, a volume resistivity of 0.08 ohm/cm (0.150 max per ASTM D991), a thermal conductivity of 1.6 W/m·K, and galvanic corrosion of 0.08% per 168-hour salt spray (ASTM B117). Thermal stability range is -60°C to 220°C. Data was generated with the Varox catalyst system.
Key Properties
- Hardness Shore A (58–78 range): 68 (ASTM D2240)
- Tensile Strength (150 minimum): 200 psi (ASTM D412)
- Elongation % (100 min): 320% (ASTM D412)
- Volume Resistivity ohm/cm (0.150 max): 0.08 ohm/cm (ASTM D991)
- Specific Gravity (1.60–2.10): 2.05 (ASTM D792)
- Thermal Stability Range: -60°C – 220°C
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- Specifications
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- General Info
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Physical Properties
| Property | Value | Test Method |
| Color | Dark Gray | — |
| Specific Gravity (1.60–2.10) | 2.05 | ASTM D792 |
Mechanical Properties
| Property | Value | Test Method |
| Shore A (58–78 range) | 68 | ASTM D2240 |
| Tensile psi (150 minimum) | 200 psi | ASTM D412 |
| Elongation % (100 min) | 320% | ASTM D412 |
| Tear “B” psi (40 min) | 50 | ASTM D624 |
Thermal Properties
| Property | Value | Test Method |
| Thermal Stability Range | -60°C – 220°C | — |
| Thermal Conductivity W/m·K | 1.6 | — |
Electrical Properties
| Property | Value | Test Method |
| Volume Resistivity ohm/cm (0.150 max) | 0.08 ohm/cm | ASTM D991 |
| Shielding Effectiveness 20 MHz–10 GHz | >110 dB | MIL-DTL-83528 |
Environmental Performance
| Property | Value | Test Method |
| Galvanic Corrosion, 168 Hour Salt Spray | 0.08% | ASTM B117 |
| Shelf Life — Uncatalyzed | Indefinite (may need freshening after 1–2 years) | — |
| Shelf Life — Catalyzed | 6 months | — |
- EMI/RFI shielding gaskets for aluminum electronic enclosures requiring corrosion-resistant nickel-plated aluminum filler to minimize galvanic corrosion at the gasket interface
- Conductive elastomeric seals for defense and commercial electronics where standard silver or copper-filled gaskets present galvanic incompatibility with housing materials
- Extruded conductive profiles for continuous shielding in enclosures requiring both EMI performance and corrosion resistance
- Press-molded shielding components for applications demanding simultaneous thermal conductivity (1.6 W/m·K) and EMI shielding
- Corrosion-resistant conductive seals for outdoor or marine-adjacent electronics operating across -60°C to 220°C
Common industries: Defense, aerospace, electronics, telecommunications, industrial equipment.
2529 is a corrosion-resistant silicone shielding elastomer in which nickel-plated aluminum particles provide EMI shielding performance while minimizing galvanic corrosion — quantified at 0.08% after a 168-hour salt spray test per ASTM B117.
This makes 2529 well suited for applications where the shielding gasket is in contact with aluminum or other lightweight metal housings where traditional silver or copper-filled elastomers can drive accelerated galvanic corrosion. It is available as fully cured sheet stock, continuous extrusion profiles, or ready-to-mold compound, with data generated using the Varox catalyst system.
The material achieves 200 psi tensile strength, 320% elongation, a Tear “B” of 50 ppi (ASTM D624), and a specific gravity of 2.05. Thermal conductivity is 1.6 W/m·K and shielding effectiveness is >110 dB (20 MHz–10 GHz) per MIL-DTL-83528. Uncatalyzed shelf life is indefinite (may need freshening after 1–2 years); catalyzed shelf life is 6 months. Cold storage will extend shelf life. No compression set value is listed on the TDS for this grade.
What differentiates 2529 from 2551 and 550-70?
2529 uses a standard silicone base (versus fluorosilicone for 2551 and 550-70) and is filled with nickel-plated aluminum particles. It is the only grade in this corrosion-resistant group to report thermal conductivity (1.6 W/m·K) on the TDS. Its galvanic corrosion at 168 hours salt spray is 0.08% versus 0.10% for 2551. Shielding effectiveness is >110 dB — lower than 2551 (>112 dB) and 550-70 (>125 dB). No compression set is listed on the TDS for 2529, whereas both 2551 and 550-70 report compression set values.
Why is compression set critical for this material?
As a conductive elastomeric shielding gasket, 2529 must maintain intimate contact with mating metal surfaces throughout its service life to sustain shielding effectiveness of >110 dB and volume resistivity of 0.08 ohm/cm. Compression set resistance ensures the gasket does not permanently deform under sustained closure load, preserving the conductive interface. No compression set value is listed on the TDS for this grade.
What is the operating temperature range for 2529?
The thermal stability range for 2529 is -60°C to 220°C as listed on the TDS.
Is 2529 suitable for regulated or military environments?
No compliance standards or military specifications are listed on the manufacturer's TDS for this material. Shielding effectiveness data was measured per MIL-DTL-83528 method.
How should 2529 be specified?
Specify grade (2529), supply form (sheet stock, extrusion profile, or compound), thickness, compliance requirements, dimensional tolerances, and finished format.
