40 Durometer FDA Grade Solid Silicone
40 Durometer FDA Grade Solid Silicone is an FDA grade solid silicone sheeting rated at 40 Shore A, designed for food contact sealing and gasketing applications. It provides a soft, highly flexible profile suitable for die-cut gaskets and seals in food processing and food service environments. The material maintains continuous service from -80°F to 450°F, with intermittent capability to 500°F, and passes FDA 21 CFR 177.2600.
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: 1.26 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 | White (other colors by special request) | — |
| Specific Gravity | 1.26 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 | Excellent | — |
| UV Resistance | Excellent | — |
Regulatory / Compliance Data
| Property | Value | Test Method |
| FDA 21 CFR 177.2600 | Pass | — |
Compliance
- FDA 21 CFR 177.2600 — Compliant (Pass)
- Food contact gaskets and seals in food processing and food service equipment
- Die-cut sealing components for FDA-regulated environments
- General-purpose seals and gaskets requiring broad thermal performance
- Flexible sealing elements where moderate compliance is required
- UV- and ozone-exposed sealing applications in food or industrial settings
Common industries: Food processing, food service equipment, pharmaceutical, HVAC, general industrial.
40 Durometer FDA Grade Solid Silicone is a soft commercial grade solid silicone sheeting at 40 Shore A, formulated for food contact applications and compliant with FDA 21 CFR 177.2600. It is positioned between the 30 and 50 Shore A grades in the series, providing a balance of compliance and physical integrity for food service gaskets and seals where moderate flexibility and conformability are required.
The material delivers 700% elongation, facilitating installation in varied gasket geometries. It exhibits excellent UV and ozone resistance, functions as an effective electrical insulator, and is readily processed by die-cutting. Low compression set is cited as a key feature, supporting sustained sealing performance.
Compliant with FDA 21 CFR 177.2600 — Pass.
What differentiates 40 Durometer FDA Grade Solid Silicone from the 30 and 50 Shore A FDA grades in this series?
40 Durometer FDA Grade Solid Silicone sits between the most compliant and mid-range grades of the FDA silicone series at 40 Shore A. It offers higher elongation (700%) than the 50-durometer grade while providing slightly more body and tear resistance than the 30-durometer grade, making it well suited for food contact applications where moderate flexibility is the priority.
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 FDA Grade Solid Silicone?
40 Durometer FDA 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 FDA Grade Solid Silicone suitable for food contact environments?
Yes. This material passes FDA 21 CFR 177.2600 and is specifically designed for food contact applications, as stated on the TDS.
How should 40 Durometer FDA Grade Solid Silicone be specified?
Specify grade (40 Durometer FDA Grade Solid Silicone), thickness, color (white standard; other colors by special request), compliance requirements, dimensional tolerances, and finished format.
