40 Durometer Commercial Grade Solid Silicone
40 Durometer Commercial Grade Solid Silicone is a commercial grade solid silicone elastomer rated at 40 Shore A, designed for extreme temperature sealing and gasketing applications requiring a soft, highly flexible material with broad thermal capability. It maintains service performance from -80°F to 450°F continuously, with intermittent resistance to 500°F. The material resists UV and ozone degradation and functions as an effective electrical insulator.
Key Properties
- Durometer / Hardness (Shore A): 40 ±5 — ASTM D2240
- Tensile Strength: 800 psi — ASTM D412
- Elongation: 700% — ASTM D412
- Tear Strength: 100 ppi — ASTM D624 (Die B)
- Specific Gravity: 1.24 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 | 1.24 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) | 40 ±5 | ASTM D2240 |
| Tensile Strength | 800 psi | ASTM D412 |
| Elongation | 700% | ASTM D412 |
| Tear Strength | 100 ppi | ASTM D624 (Die B) |
Thermal Properties
| Property | Value | Test Method |
| Low Temperature Resistance | -80°F | — |
| High Temperature Resistance | 450°F | — |
| High Intermittent Temperature | 500°F | — |
Environmental Performance
| Property | Value | Test Method |
| Ozone Resistance | Yes | — |
| UV Resistance | Yes | — |
- Gaskets and seals for high-temperature oven and furnace assemblies
- HVAC system gaskets and seals requiring broad thermal performance
- Silicone boot profiles for curtain wall glazing systems
- Sealing elements in UV- and ozone-exposed outdoor installations
- General-purpose flexible gaskets where moderate compliance is required
Common industries: HVAC, construction / architectural glazing, industrial equipment, appliance manufacturing.
40 Durometer Commercial Grade Solid Silicone is a commercial grade solid silicone elastomer positioned at 40 Shore A, providing a soft yet slightly firmer profile than the 30-durometer grade in this series. It is designed for gasketing, sealing, and glazing applications in environments with demanding thermal requirements, where material compliance and conformability remain priorities. The 700% elongation indicates high flexibility, accommodating movement and dimensional variation in mating assemblies.
This grade offers inherent resistance to UV radiation and ozone, supporting its use in exterior architectural and HVAC applications. The material is readily die-cut into precision gasket and seal profiles. Low compression set is cited as a key feature, supporting long-term sealing performance under sustained load.
What differentiates 40 Durometer Commercial Grade Solid Silicone from the 30 and 50 Shore A grades in this series?
40 Durometer Commercial Grade Solid Silicone occupies the mid-soft position in the commercial solid silicone series at 40 Shore A. It delivers higher elongation (700%) than the 50-durometer grade while providing slightly more body than the 30-durometer grade, making it appropriate where moderate compliance is needed alongside a defined resistance to 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 40 Durometer Commercial Grade Solid Silicone?
40 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 40 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 outdoor architectural and HVAC applications. No specific compliance standards are cited on the TDS.
How should 40 Durometer Commercial Grade Solid Silicone be specified?
Specify grade (40 Durometer Commercial Grade Solid Silicone), thickness, color (black standard; other colors by special request), dimensional tolerances, and finished format.
