90 Durometer Commercial Grade Solid Silicone
90 Durometer Commercial Grade Solid Silicone is a commercial grade solid silicone elastomer rated at 90 Shore A — the firmest grade in this series — designed for extreme temperature applications requiring maximum hardness and dimensional stability. 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): 90 ±5 — ASTM D2240
- Tensile Strength: 800 psi — ASTM D412
- Elongation: 200% — ASTM D412
- Tear Strength: 120 ppi — ASTM D624 (Die B)
- Specific Gravity: 1.38 g/cc — ASTM D297
Service Temperature Range: -80°F to 450°F continuous; 500°F intermittent
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Material / Substrate | Solid Silicone | — |
| Color | Black (other colors by special request) | — |
| Specific Gravity | 1.38 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) | 90 ±5 | ASTM D2240 |
| Tensile Strength | 800 psi | ASTM D412 |
| Elongation | 200% | ASTM D412 |
| Tear Strength | 120 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 | — |
- Setting blocks for curtain wall and commercial window and door assemblies requiring maximum load resistance
- Insulators and separators in high-temperature electrical and industrial enclosures
- Oven door and furnace seals where minimal gasket creep is critical
- Sealing elements for buildings with critical high-temperature structural performance requirements
- RV oven seals and high-temperature appliance gasketing demanding firm profile retention
Common industries: Construction / architectural glazing, industrial equipment, appliance manufacturing, HVAC, electrical / electronics.
90 Durometer Commercial Grade Solid Silicone is the highest-durometer grade in the commercial solid silicone series at 90 Shore A, designed for applications that demand maximum hardness and minimal elastic deformation. It is appropriate for structural setting blocks, precision insulators and separators, and seals in high-temperature architectural, industrial, and appliance environments where gasket creep or deformation under load must be minimized.
This grade carries the highest tear strength in the series at 120 ppi, reflecting its highly crosslinked, firm compound structure.
The material provides inherent resistance to UV radiation and ozone, supporting performance in exterior environments. Low compression set is cited as a key feature. The material is readily processed by die-cutting. Elongation is reduced to 200% compared to softer grades, consistent with its firm, high-durometer profile.
What differentiates 90 Durometer Commercial Grade Solid Silicone from softer grades in this series?
90 Durometer Commercial Grade Solid Silicone is the firmest grade available in this commercial solid silicone series at 90 Shore A. It carries the highest tear strength in the lineup at 120 ppi, making it the most resistant to physical damage from sharp edges or high-contact-stress installations. It is the appropriate selection when maximum hardness and minimum deformation under load are the primary design criteria.
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 90 Durometer Commercial Grade Solid Silicone?
90 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 90 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 90 Durometer Commercial Grade Solid Silicone be specified?
Specify grade (90 Durometer Commercial Grade Solid Silicone), thickness, color (black standard; other colors by special request), dimensional tolerances, and finished format.
