70 Durometer Commercial Grade EPDM Sheet
70 Durometer Commercial Grade EPDM Sheet is a firm-durometer ethylene propylene diene monomer (EPDM) sheeting compound with a service temperature range of -40 to +220°F, a tensile strength of 1100 psi, and elongation of 250%. The material is compliant with RoHS, REACH, and California Proposition 65 and is manufactured in the USA. At 70 Shore A, this grade provides the highest compression resistance in the Commercial Grade EPDM Sheet line and is suited for sealing applications where dimensional stability under load and resistance to extrusion are the primary design requirements. Available – cloth-inserted (CI) construction for enhanced dimensional stability.
Key Properties
- Hardness, Shore A: 70 (ASTM D2240)
- Tensile Strength: 1100 psi (ASTM D412)
- Elongation: 250% (ASTM D412)
- Service Temperature Range: -40 to +220°F
- Compliance: RoHS, REACH, California Proposition 65
- Polymer: EPDM (Ethylene Propylene Diene Monomer)
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Typical Value | Test Method |
| Hardness, Shore A | 70 | ASTM D2240 |
| Tensile Strength, psi | 1100 | ASTM D412 |
| Elongation, % | 250 | ASTM D412 |
| Temperature Range | -40 to +220°F | — |
Compliance
- RoHS — Compliant
- REACH — Compliant
- California Proposition 65 — Compliant
- High-load flange gaskets and compression seals
- Weather sealing and environmental enclosure gaskets
- HVAC system seals and duct gaskets
- Outdoor and UV-exposed sealing applications
- General industrial water and steam sealing
Common industries: HVAC, Building & Construction, Industrial Manufacturing, Outdoor Equipment, General Sealing.
70 Durometer Commercial Grade EPDM Sheet is the firmest grade in the Commercial Grade EPDM Sheet line, offering 70 Shore A hardness and the highest compression resistance in the series. At this hardness level, the material resists extrusion and deformation under high bolt loads, maintaining a stable sealing cross-section through the service life of the joint. This makes it the appropriate selection for high-load flange gasket applications and wherever compressive forces are elevated enough to cause softer grades to flow or extrude.
With a tensile strength of 1100 psi and elongation of 250%, the material provides solid mechanical performance across its -40 to +220°F service temperature range. The EPDM polymer delivers inherent resistance to weathering, ozone, UV exposure, water, and steam, supporting outdoor, HVAC, and general industrial sealing service. The material is RoHS compliant, REACH compliant, and California Proposition 65 compliant, and is manufactured in the USA.
What differentiates 70 Durometer Commercial Grade EPDM Sheet from the 50 Durometer and 60 Durometer grades?
70 Durometer Commercial Grade EPDM Sheet is the firmest grade in the line at 70 Shore A, providing the highest compression resistance and the greatest resistance to extrusion under high bolt loads. 60 Durometer Commercial Grade EPDM Sheet is the mid-range grade and carries an ASTM D2000 M2AA606 C12 F17 specification for applications requiring a documented material standard. 50 Durometer Commercial Grade EPDM Sheet is the softest grade, offering the highest elongation and tensile strength for maximum conformability on low-load or irregular surfaces.
Why is a firm durometer EPDM sheeting grade preferred in high-load sealing applications?
At higher bolt loads and clamping forces, softer elastomers can extrude beyond the sealing interface or take a permanent compression set that reduces sealing force over time. A 70 Shore A material resists these failure modes, maintaining its cross-section and sealing load through the service life of the joint. Selecting the correct hardness for the applied load prevents both initial blow-out and long-term seal relaxation.
What is the service temperature range for 70 Durometer Commercial Grade EPDM Sheet?
The service temperature range is -40 to +220°F, as listed on the Technical Datasheet.
Is 70 Durometer Commercial Grade EPDM Sheet suitable for outdoor and UV-exposed applications?
Yes. EPDM polymer provides inherent resistance to weathering, ozone, and UV radiation, making all grades in the Commercial Grade EPDM Sheet line well suited for outdoor exposure. The -40°F lower temperature limit also supports cold-climate installation and service.
How should 70 Durometer Commercial Grade EPDM Sheet be specified?
Specify grade (70 Durometer Commercial Grade EPDM Sheet), thickness, compliance requirements, dimensional tolerances, and finished format.
