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. We can also make custom silicone gaskets with a pressure sensitive adhesive (PSA) or other adhesive backing. Learn more about our gasket fabrication capabilities.

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Silicone Gasket Advantages

Silicone gaskets are made from silicone rubbers, a family of synthetic elastomers.

  • Provides environmental sealing
  • Offers excellent temperature stability
  • Resist ozone, sunlight, weathering, and aging
  • Chemically inert
  • Have good dielectric properties
  • Maintain their flexibility at low temperatures
  • Can withstand high temperatures

Interstate also die cuts custom gaskets from silicone compounds with specialized properties.

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 contain different ingredients and use a different curing system. Hardness or durometer also distinguishes silicone seals. 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 die cut gaskets from relatively hard silicones.

Sponge Silicone Gaskets

Sponge silicone gaskets are made of porous 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 materials 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 combination (i.e. having both open and closed cells). Like solid silicones and sponge silicones, foam silicones have numerous applications.

Silicone Gasket Applications

Silicone gaskets are used in medtech, electronic, military, food processing, and transportation-related applications. Because of silicone rubber’s temperature stability, these elastomers are great for high 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-Approved & UL 94 Silicone 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-resistant silicone sponge or foam meet UL burn tests and provide good sealing and moderate-to-good cushioning.

EMI Shielding & Chemical Resistant Silicone Gaskets

EMI shielding gaskets are made of electrically-conductive silicone compounds that resist electromagnetic interference (EMI). These shielding silicones contain metal particles and can be manufactured to 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.

Custom Die Cut Silicone Gaskets

Interstate Specialty Products die cuts solid, sponge, and foam silicone gaskets. We also specialize in the custom manufacture of FDA silicone gaskets, UL 94 gaskets, EMI shielding gaskets, and chemical resistant gaskets made of compounds such as fluorosilicone. To promote ease of installation, your custom silicone gaskets can be supplied with a pressure sensitive adhesive (PSA) or other adhesive backing.

To learn how our custom die cut silicone gaskets can support your application, contact us on-line or call (800) 984-1811.

*Properties and applications shown throughout this website are typical. Your specific application should not be undertaken without independent study and evaluation for suitability.

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