Product Overview
70 Durometer Commercial Grade Solid Silicone — Technical Overview & FAQs
Product Overview
70 Durometer Commercial Grade Solid Silicone Rubber is a firm, high-strength silicone elastomer engineered for applications requiring maximum durability, rigid sealing structure, and resistance to mechanical deformation.
At 70 Shore A, this material is significantly firmer than typical silicone grades (30A–60A), offering exceptional load support, improved tear resistance, and high mechanical stability under compression.
It is ideal for industrial machinery, transportation equipment, heavy-duty sealing, and high-pressure gasket applications.
Despite its firmness, 70A silicone maintains the inherent benefits of silicone rubber—including extreme temperature resistance, UV and ozone protection, and long-term material stability—making it suitable for demanding indoor and outdoor applications.
Applications
High-pressure industrial and mechanical gaskets
Heavy-duty environmental seals
Transportation, aerospace, and automotive sealing
Control panel, junction box, and electrical enclosure gaskets
High-strength pads, isolation layers, and die-cut components
Machinery door seals, equipment housings, and HVAC systems
Key Properties
Durometer: 70 Shore A (firmest commercial grade silicone)
Mechanical Strength: High tensile and tear resistance
Compression Set: Excellent long-term sealing under high loads
Elongation: Moderate — maintains controlled flexibility
Temperature Range: –80 °F to +450 °F (–62 °C to +232 °C)
Environmental Resistance: Superior UV, ozone, and outdoor durability
Chemical Resistance: Good resistance to oils, solvents, and weathering
Electrical Properties: Strong dielectric insulation characteristics
Available Formats: Sheets, rolls, strips, extruded profiles, die-cut parts, PSA-backed versions
Compliance: RoHS | REACH
FAQs
What is 70 Durometer Solid Silicone used for?
It is used for heavy-duty sealing, high-compression gaskets, and industrial components requiring rigidity, dimensional stability, and long-term durability.
How firm is 70 durometer silicone?
70A silicone is the firmest standard commercial-grade silicone. It provides:
Strong load-bearing capacity
Low deformation under force
High tear and tensile strength
Ideal performance in mechanically demanding applications
Is 70 durometer silicone suitable for outdoor or weather-exposed applications?
Yes. Silicone rubber provides outstanding UV, ozone, and weather resistance, making 70A ideal for outdoor and long-duration installations.
How does this material perform at high temperatures?
It operates reliably from –80 °F to +450 °F, maintaining sealing integrity and mechanical stability in extreme thermal environments.
Can this material be die-cut, slit, or supplied with PSA backing?
Absolutely — H-O Products provides die-cut gaskets, PSA-backed sheets, strips, and custom-engineered silicone components for OEM production.
Contact H-O Products today for 70 Durometer Commercial Grade Solid Silicone samples, die-cut gasket solutions, or application-specific material guidance - contact us.
