Silicone gaskets from Interstate are made of solid, sponge, or foam silicones and die cut to your precise specifications. Your custom gaskets can also be supplied with an adhesive backing for ease of installation.
Interstate Specialty Products manufactures silicone gaskets that meet all of your sealing and insulation requirements. We use precision die cutting to convert sheets and rolls of silicone materials, and can achieve tight tolerances in large and small gasket sizes. Do you need die cut silicone rubber gaskets? Do you use custom silicone gaskets with a pressure sensitive adhesive (PSA) or other adhesive backing? Learn more about our gasket fabrication capabilities.
Silicone Gasket Types
Silicone gaskets can be categorized in several different ways. For example, solid silicone gaskets and sponge silicone gaskets are distinct because they have different molecular structures. Hardness or durometer also distinguishes silicone seals. Foam silicone gaskets may be soft like sponge silicone gaskets, but foam silicones are distinct because they contain different ingredients and use a different curing system. Interstate die cuts all of these silicone gasket types.
Solid Silicone Gaskets
Solid silicone gaskets are made of solid rubber materials with a tightly-packed molecular structure.
- They have lower durometers (hardness) and compression rates than sponge silicones
- Not all solid silicones are “soft”, however
- Lower-durometer solid silicones provide strong environmental sealing with low closure force
- Solid silicone gaskets with mid-range durometers require greater closure force
Interstate can also diecut gaskets from relatively hard silicones.
Sponge Silicone Gaskets
Sponge silicone gaskets are made of sponge-like silicone compounds that provide cushioning and padding. Interstate die cuts both basic types of sponge silicone materials: open-cell and closed-cell.
- Open-cell silicone gaskets contain interconnected pockets that, unless the gasket is compressed, allow water, chemicals, and air to pass
- Closed-cell silicone gaskets are filled with nitrogen gas to prevent the passage of these substances at low pressures
Foam Silicone Gaskets
Foam silicone gaskets are made of soft, medium, firm, or extra-firm silicone grades for different amounts of compressibility.
- They have a lower compression set than sponge silicone gaskets
- Offer improved flame resistance
Interstate die cuts the three basic types of foam silicone materials: open-cell, closed-cell, and silicone rubber that has both open and closed cells. Like solid silicones and sponge silicones, foam silicones have numerous applications.
Silicone Gasket Applications
Silicone gaskets are used in medical, electronic, military, food processing, and transportation-related applications. Because of silicone rubber’s temperature stability, these elastomers are great for high-temperature gaskets and low-temperature gaskets. Non-toxic, chemically-inert silicone is also a good choice for sanitary applications. Silicone can be filled with metal particles for EMI shielding, and fluorine additions provide fuel and chemical resistance.
FDA Silicone Gaskets and UL 94 Gaskets
FDA silicone gaskets meet U.S. Food and Drug Administration (FDA) requirements for food contact applications and medical devices. Not all food-grade rubber gaskets are FDA-approved, however. UL 94, an Underwriters Laboratories (UL) standard for flame resistance and fire safety, is also used with silicone gaskets. UL 94 gaskets that are made of flame-related silicone sponge or foam meet UL burn tests and provide good sealing and moderate-to-good cushioning.
EMI Gaskets and Chemical Resistant Gaskets
EMI gaskets are made of electrically-conductive silicone compounds that resist electromagnetic interference (EMI). These shielding silicones contain metal particles and can meet MIL-DTL-8352C requirements. Available in a range of durometers, these conductive elastomers also come in fluorosilicone. With or without metal particles for EMI shielding, fluorosilicone gaskets provide chemical and fuel resistance for automotive, aerospace, and military applications.