SSP2575
SSP2575 is a 65 durometer heat-cured silicone elastomer formulated for low outgas and low temperature applications, with low temperature flexibility to -116°C (-177°F). Tensile strength is 1,350 psi, elongation 600%, and specific gravity 1.18–1.24. Supplied catalyzed with a Varox (DBPH) peroxide cure system, ready for press-cure molding as compound, compression-molded sheet stock, or custom-molded parts. Black is standard; custom pigmenting is available. Cure profile is 10 minutes at 177°C (350°F) with a 4-hour post bake at 200°C (390°F).
Key Properties
- Durometer (Shore A): 65 (59–69 range)
- Tensile Strength: 1,350 psi (350 psi minimum)
- Elongation: 600% (175% minimum)
- Specific Gravity: 1.18–1.24
- Low Temperature Flexibility: -116°C (-177°F)
- Cure System: Varox (DBPH) peroxide, low outgas formulation
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- Specifications
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Mechanical Properties
| Property | Value | Test Method |
| Durometer (Shore A) | 65 (59–69 range) | ASTM D2240 |
| Tensile Strength | 1,350 psi (350 psi minimum) | ASTM D412 |
| Elongation | 600% (175% minimum) | ASTM D412 |
| Specific Gravity | 1.18–1.24 | ASTM D792 |
| Low Temperature Flexibility | -116°C (-177°F) | — |
Material & Process Properties
| Property | Value | Test Method |
| Material Type | Low Outgas, Low Temperature Heat-Cured Silicone Elastomer | — |
| Cure System | Varox (DBPH) Peroxide (Pre-catalyzed) | — |
| Cure Profile | Compression cure, 10 minutes at 177°C (350°F); post bake 4 hours at 200°C (390°F) | — |
| Standard Colors | Black (standard); custom pigmenting available | — |
| Supply Formats | Ready-to-mold compound, compression molded sheet stock, custom molded parts | — |
Shelf Life / Storage
| Property | Value | Test Method |
| Compound Shelf Life (catalyzed with DBPH Varox) | 6 months (cold storage will extend shelf life) | — |
Data above was generated with the Varox catalyst system. SDS information is available on request.
- Aerospace, satellite, and vacuum-system seals and gaskets where low outgassing is required to protect optics, sensors, and sensitive electronics from contamination
- Cryogenic and extreme cold-climate sealing requiring flexibility to -116°C (-177°F)
- Defense and precision-instrument gaskets and molded components exposed to low temperature service
- Electronics and sensor enclosure sealing in vacuum or thermal-cycling environments
- Custom-molded parts requiring a 65 Shore A durometer with 600% elongation
Common industries: Aerospace, spacecraft and satellite, defense, electronics and sensors, precision optics, cryogenic equipment.
SSP2575 is a black, 65 durometer heat-cured silicone elastomer manufactured by Specialty Silicone Products, Inc. (SSP) and designed for applications that require both low outgassing and low temperature flexibility. The material uses a Varox (DBPH) peroxide catalyst system and is supplied catalyzed and ready for press-cure molding.
The defining characteristic of SSP2575 is its low temperature flexibility rating of -116°C (-177°F), which extends silicone service well below the range of general-purpose grades. Combined with its low outgas formulation, this makes SSP2575 a candidate for sealing and gasketing in spacecraft, satellite, vacuum-system, and cryogenic assemblies where volatile release from the elastomer could contaminate adjacent optics, sensors, or electronics. Mechanical properties are 1,350 psi tensile strength (350 psi minimum), 600% elongation (175% minimum), and a specific gravity of 1.18–1.24.
SSP2575 is available as ready-to-mold compound, compression-molded sheet stock, or custom-molded parts. Black is the standard color and the material can be pigmented to a customer’s requirement. Cure profile is a 10-minute compression cure at 177°C (350°F) followed by a 4-hour post bake at 200°C (390°F). Catalyzed compound shelf life is 6 months; cold storage will extend shelf life. H-O Products die-cuts and converts SSP2575 sheet stock into finished gaskets and components in Winsted, CT.
What makes SSP2575 different from a general-purpose 65 durometer silicone?
SSP2575 is formulated for two specific requirements: low outgassing and low temperature flexibility to -116°C (-177°F). General-purpose silicone grades are typically rated to around -55°C to -65°C and are not formulated to minimize volatile release. Select SSP2575 when the application involves vacuum, spaceflight, or cryogenic service where a standard grade would either stiffen or outgas.
What is the low temperature limit for SSP2575?
The TDS lists low temperature flexibility of -116°C (-177°F). An upper service temperature is not published on the TDS; the cure profile is specified at 177°C (350°F) with a 200°C (390°F) post bake. Specifiers requiring a full service temperature range for their application should contact H-O Products for a material engineering review.
Does SSP2575 carry ASTM E595 or NASA outgassing data?
The TDS describes SSP2575 as a low outgas formulation but does not publish ASTM E595 Total Mass Loss (TML) or Collected Volatile Condensable Material (CVCM) values. If your specification requires documented ASTM E595 or NASA-STD-6016 compliance, request test data through H-O Products before specifying, or consider Low Outgassing Silicone Sheeting, which publishes TML ≤1.00% and CVCM ≤0.10%.
How is SSP2575 cured and supplied?
SSP2575 uses a Varox (DBPH) peroxide catalyst system and is supplied catalyzed, ready for press-cure molding. Cure profile is a 10-minute compression cure at 177°C (350°F) followed by a 4-hour post bake at 200°C (390°F). It is available as ready-to-mold compound, compression-molded sheet stock, or custom-molded parts. Catalyzed compound shelf life is 6 months; cold storage will extend it.
How should SSP2575 be specified?
Specify product (SSP2575), durometer (65 Shore A, 59–69 range), color (black standard / custom pigment), supply format (ready-to-mold compound / compression-molded sheet stock / custom molded part / converted die-cut), thickness, dimensional tolerances, and any low temperature or outgassing requirements the finished part must meet.
