70 Durometer Commercial Grade Solid Silicone
70 Durometer Commercial Grade Solid Silicone is a commercial grade solid silicone elastomer rated at 70 Shore A, designed for extreme temperature sealing, gasketing, and structural load-bearing applications. It is rated for continuous service from -80°F to 450°F, with intermittent capability to 500°F. The material provides UV and ozone resistance and functions as an effective electrical insulator.
Key Properties
- Durometer / Hardness (Shore A): 70 ±5 — ASTM D2240
- Tensile Strength: 900 psi — ASTM D412
- Elongation: 400% — ASTM D412
- Tear Strength: 110 ppi — ASTM D624 (Die B)
- Specific Gravity: 1.43 g/cc — ASTM D297
- Service Temperature Range: -80°F to 450°F continuous; 500°F intermittent
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Material / Substrate | Solid Silicone | — |
| Color | Black (other colors by special request) | — |
| Specific Gravity | 1.43 g/cc | ASTM D297 |
| Thickness | 1/32″, 1/16″, 3/32″, 1/8″, 3/16″, 1/4″, 1/2″ | — |
Mechanical Properties
| Property | Value | Test Method |
| Durometer / Hardness (Shore A) | 70 ±5 | ASTM D2240 |
| Tensile Strength | 900 psi | ASTM D412 |
| Elongation | 400% | ASTM D412 |
| Tear Strength | 110 ppi | ASTM D624 (Die B) |
Thermal Properties
| Property | Value | Test Method |
| Low Temperature Range | -80°F | — |
| High Temperature Range | 450°F | — |
| High Intermittent Temperature | 500°F | — |
Environmental Performance
| Property | Value | Test Method |
| Ozone Resistance | Yes | — |
| UV Resistance | Yes | — |
- Setting blocks for curtain wall and commercial window and door assemblies
- Furnace seals and oven door gaskets in high-temperature industrial and appliance applications
- Insulators and separators in thermally and electrically demanding enclosures
- Sealing elements for buildings with critical sustained high-temperature requirements
- RV oven seals and related appliance gasketing
Common industries: Construction / architectural glazing, industrial equipment, appliance manufacturing, HVAC, electrical / electronics.
70 Durometer Commercial Grade Solid Silicone is a firm commercial grade solid silicone elastomer at 70 Shore A, providing greater resistance to deformation under compressive load than the softer grades in this series.
It is intended for applications in which the gasket or seal must maintain geometry and sealing force under sustained pressure in high-temperature service environments, including oven door assemblies, furnace seals, and curtain wall setting blocks. The 900 psi tensile strength and 110 ppi tear resistance reflect a mechanically robust profile for a solid silicone elastomer.
The material resists UV radiation and ozone degradation, supporting exterior architectural use. Low compression set is a stated key feature of this grade, indicating formulation for sustained sealing performance. The material is readily fabricated by die-cutting.
What differentiates 70 Durometer Commercial Grade Solid Silicone from softer and firmer grades in this series?
70 Durometer Commercial Grade Solid Silicone provides the highest tear strength in the mid-to-firm range of this series at 110 ppi alongside a 70 Shore A durometer, offering a combination of firm resistance to deformation and strong resistance to tearing. This makes it particularly suited for structural sealing and setting block applications where the material must bear load without permanent deformation.
Why is compression set an important consideration for solid silicone elastomers?
Compression set measures how well an elastomer recovers its original thickness after sustained compression. In sealing applications, a material with high compression set will permanently deform over time, reducing sealing force and allowing leak paths to develop. Low compression set is listed as a key feature of this material, indicating it is formulated to maintain sealing integrity over extended service periods.
What is the service temperature range for 70 Durometer Commercial Grade Solid Silicone?
70 Durometer Commercial Grade Solid Silicone is rated for continuous service from -80°F to 450°F, with a high intermittent temperature resistance of 500°F, as listed on the TDS.
Is 70 Durometer Commercial Grade Solid Silicone suitable for outdoor or UV-exposed environments?
Yes. The TDS states that this material exhibits both UV resistance and ozone resistance, making it appropriate for exterior architectural and glazing applications. No specific compliance standards are cited on the TDS.
How should 70 Durometer Commercial Grade Solid Silicone be specified?
Specify grade (70 Durometer Commercial Grade Solid Silicone), thickness, color (black standard; other colors by special request), dimensional tolerances, and finished format.
