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Home > Materials > Silicone Foam Products, Silicone Foam Gasket Material

Silicone Foam for Gaskets, Cushioning Pads, Tape

Silicone Foam Gaskets

Silicone foam products are a core product group at Stockwell Elastomerics. Stockwell Elastomerics inventories and fabricates the full product line of Rogers BISCO® Silicones silicone foams. These silicone foam products have excellent performance properties such as low compression set, high temperature stability, low temperature flexibility, flame rated (UL 94, FAR), and environmental sealing (UL 50, UL 508).

Stockwell Elastomerics' silicone foam fabricating processes include die cutting, water jet cutting, and slitting to width (foam gasket tape rolls). Stockwell Elastomerics also applies a variety of pressure sensitive acrylic and silicone adhesive backings to all silicone rubber sheet products.

Visit the Silicone Sponge and Silicone Foam Sheet Material Data Sheets page for detailed technical information on these materials. See also:

Silicone Materials Selection Guide


SE204T Silicone Foam Touch Brochure

Request a Free Silicone
Foam Touch Brochure

Includes small samples of cured silicone foam materials to touch and feel.

Request Brochure

What is Silicone Foam?

Silicone foam is generally made from platinum cured, liquid silicone that is expanded and dispensed on a continuous casting line, then heat cured. The expansion process is controlled to create a range of products having different densities, softness/firmness and cell structures. Silicone foam materials typically have a smooth skin on one or both sides due to the casting process. Open cell silicone foams are often used for cushioning, dust sealing or light water sealing. Closed cell silicone foams are used for outdoor gaskets, washdown gaskets and cushioning. Expanded silicone foams range from Ultra Soft to Extra Firm, allowing designers to select the best product for their application.

Silicone Foam Gaskets and Silicone Foam Cushioning Pads

Key Benefits of Silicone Foam

  • Wide operating temperature - silicone foam has a temperature range of -67°F to 392°F (-55°C to 200°C).
  • Water sealing - the closed cell products offer good water sealing with relatively low compressive forces.
  • Dust sealing - open cell and closed cell products can be used for sealing out dust with low compressive forces.
  • Compression set resistance - silicone foam offers excellent compression set resistance (ability to rebound to original thickness).
  • UV and ozone resistance - silicone products have excellent UV and ozone resistance due in part to their inorganic backbone. This provides long term performance.
  • UL gasketing - most silicone foam products carried by Stockwell Elastomerics are UL 94 flame rated and UL 50 and UL 50E rated for gasketing.

Why Use Silicone Foam Rubber?

Silicone foam rubber is very resilient (low compression set), has a wide operating temperature range -67°F (-55°C) to 392°F (200°C) and are UV / ozone resistant. Silicone remains flexible and resilient in outdoor environments and in freezing or hot conditions, making it an excellent gasket and cushion material.

Rogers BISCO® and Saint-Gobain COHRlastic® silicone foams are available in a wide range of firmnesses and are flame rated per UL 94, most are UL 94V-0 listed. Several of the BISCO silicone foams are UL 50, UL 50E, and UL 508 listed for gasketing applications.

Common industry applications

  • Telecommunications outdoor enclosures (environmental gasket)
  • Portable data acquisition (gasketing and cushioning)
  • Indoor lighting (dust gasket, UL 94V-0)
  • Outdoor LED lighting (weather gasket, long life, UL listed)
  • Asset tracking (environmental gasket, low compression set)
  • Instrumentation (vibration dampening)
  • Electronics (touch screen gaskets, cushioning)

Silicone Foam Products, BISCO® Silicones

Stockwell Elastomerics offers the following silicone foam products that can be supplied in sheets, rolls, die cut or water jet cut parts, and silicone foam tape/gasket tape. All BISCO® Silicones products listed below are available with acrylic or silicone adhesive backing of choice; view Stockwell Elastomerics' adhesive options. Rogers Corp - BISCO Silicones logo
Stockwell Elastomerics is a Rogers Corporation Preferred Converter and one of the leading authorized suppliers of BISCO® Silicones in the USA. Stockwell Elastomerics, a Rogers Corp. Preferred Converter logo
  • Ultra Soft BISCO® Silicone Foam: BF-2000 (1.5 psi)
  • Extra Soft BISCO® Silicone Foam: BF-1000 (1 - 5 psi) and F12 (4 psi)
  • Soft BISCO® Silicone Foam: HT-870 (2 - 7 psi)
  • Medium BISCO® Silicone Foam: HT-800 (6 - 14 psi)
  • Firm BISCO® Silicone Foam: HT-820 (12 - 20 psi)
  • Extra Firm BISCO® Silicone Foam: HT-840 (16 - 26 psi)
  • BISCO® Silicone Foam Gasket Tape: HT-800 gasket tape, rolls with acrylic adhesive

Silicone Sponge or Silicone Foam? What is the Difference?

Silicone sponge is derived from a thin sheet of uncured silicone gum that is chemically blown or expanded while curing in a high temperature press or rotocure. Silicone sponge products are considered to be fully closed cell, meaning the cells are non-interconnecting, therefore they do not allow water to wick through. Silicone sponges are tougher and have better tear resistance than silicone foams. Silicone sponge often provides better water sealing in heavy wash-down applications as compared to silicone foam.

Silicone foams are lightweight products derived from liquid silicone ingredients that are cast onto a liner and cured in an oven. Low density silicone foams have open cell structure that may allow moisture to pass through the cell structure. Open cell silicone foam can be compressed to collapse the cells offering a water tight seal. In contrast, higher density silicone foam products will have a higher proportion of closed cells compared with medium or low density grades. As with all gaskets, with the proper deflection, a good long term weather seal can be achieved.

Specifications Met by Silicone Foam Materials

Silicone foam materials meet UL 94, UL 50, UL 50E, UL 508 (UL 60947), UL 1570, UL 1571, UL 1572, UL 157 requirements. Also see silicone sponge materials for other materials that meet AMS3195, AMS3196, MIL-R-46089, MIL-R-6130 Type II, ASTM D6576, and UL 94V-0 requirements. View specific products for details.

Silicon Foam or Silicone Foam?

Although silicon foam or silicon is called out frequently called out on prints, silicone foam is the widely accepted terminology used in the rubber industry.

SE204T Silicone Foam Touch Brochure

Request a Free Silicone
Foam Touch Brochure

Includes small samples of cured silicone foam materials to touch and feel.

Request Brochure

Contact Stockwell Elastomerics for Silicone Foam Products - Gaskets, Pads and Tape

Contact Us for further assistance with silicone foam materials, including BISCO® Silicones, for gasketing, cushioning pads and in rolls (gasket tape/slicone foam tape).

Related Information:


    Silicone Sponge and Silicone Foam Sheet Material Data Sheets page

Listing of Pressure Sensitive Adhesives

Compression Force Deflection Curves for Cellular Foams

Silicone Materials Selection Guide


BISCO® is a registered trademark of Rogers Corporation.
COHRlastic® is a registered trademark of Saint-Gobain.