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Home > Materials > Thermal Interface Material

Thermal Interface Material

Thermal interface materials (TIMs) provided by Stockwell Elastomerics help manage heat transfer in electronic assemblies, sublimation printing and a variety of other industries and applications. Products include very soft gap filler pads, thin thermally conductive fabrics, thermally conductive rubber, green heat conducting sponge, graphite films and other thermal films. Stockwell Elastomerics custom cuts thermal management to customer drawings; these can range from basic rectangular pads to complex shapes. Thermal interface materials are designed to help remove the heat generated by an electronic device to the ambient environment to ensure reliable operation of electronic hardware, communication equipment and portable electronics. Thermal interface materials provide a thermal path between the heat source and heat sink.

Gap Pad® and Gap Filler - Silicone Thermal Interface Materials

Thermal Conductive Pads

What is a Thermal Gap Filler? – Thermal gap fillers are compliant pads used to bridge an air gap between a heat source and a heat sink. Thin gap fillers are used regularly to improve the efficiency of finned heat sinks. Thick thermal gap fillers are used to conduct heat to chassis or electronic enclosures.

Stockwell Elastomerics manufactures thermal gap filler pads made from the top material manufacturers like Saint-Gobain, The Bergquist Company and 3M. Thermal gap fillers are made from silicone (or acrylic) polymer that is filled with ceramic particles. The polymer has a gel-like modulus - unlike a cured silicone rubber, it is very soft and compliant and does not rebound well. In general, thermal gap fillers are intended to be compressed once. Gap filler pads are not electrically conductive and most have UL 94V-0 flame ratings.

Thermally Conductive Gap Pads Video Demo

The video below is a visual representation of how thermal gap fillers work. A TC-3008 thermal pad is applied to bottom of one beaker while the other is place directly onto a heat source. The thermal gap filler conforms to the irregularities between the surface which eliminates air pockets and creates a thermal bridge; this in turn allows more energy to transfer to the water. The beaker with the gap filler boils more quickly than the beaker without the pad. (Note: This video is a visual example and not the intended use for thermal gap fillers.)


Visit the Thermally Conductive Materials Data Sheets page for detailed technical information on these materials.

Thermal Gap Filler Sheets

Saint-Gobain manufactures various thermal interface materials (TIMs) including thermal fabrics, thermally conductive silicone sponge and thermal gap fillers. With a standard sheet size of 20" x 20" (508mm x 508mm), Saint-Gobain’s gap fillers offer good value and performance. Standard thicknesses are .020" to .200", the large gap filler sheets allow for excellent part yield and larger thermal pads.

The Bergquist Company makes the Gap Pad® brand of thermal gap filler materials. Bergquist Gap Pad VO Ultra Soft is a ultra-compliant and is supplied with a conductive silicone/fiberglass cloth on one side. Gap Pad Ultra Soft VO is available in a range of .020" to .200" thick, has a thermal conductivity value of 1.0 W/m-K, and is UL 94V-0 rated. Stockwell Elastomerics cuts custom shapes from the standard 8" x 16" sheets.

Thermally Conductive Sponge

NORSEAL® (formerly COHRlastic®) R10404M green heat conductive rubber is a unique closed cell silicone sponge. This cured thermal interface material differs from gap filler materials in that it rebounds after being compressed and can be recompressed many times. R10404 thermally conductive silicone sponge has lower thermal conductivity than the gap filler material mentioned above, but R10404M is 5 times more conductive than standard silicone sponge.

R10404M thermally conductive silicone rubber is available .032" to 0.188” thick in continuous rolls that are 36” wide or .250" thick sheets 36" x 36". Stockwell Elastomerics can apply thermally conductive adhesive (or other stronger adhesives) and cut to size. R10404 green conductive silicone sponge is widely used as heat press pads, thermal pad for heat sinks, gaskets and cushioning pads.

Thermal Management Products

SE200 Thermally Conductive Materials Flier

Contact Stockwell Elastomerics for Thermal Interface Material

Contact Us for further assistance with silicone thermal interface materials and thermally conductive pads and gap fillers.

Gap Pad® is a registered trademark of The Bergquist Company.
NORSEAL® and COHRlastic® are registered trademarks of Saint-Gobain.