The BISCO RS-800 series is trusted in a variety of applications, for gasketing and gap filling, including electrical enclosures, lighting fixtures and transportation.

BISCO RS-800 products exhibit excellent flame resistance to UL94 V-0, a compression set of below 5%, as well as high tensile strength and elongation. These properties make BISCO RS-Series materials resilient, enabling them to outperform competitive materials in challenging environments where superior silicone performance is needed.

BISCO RS-Series materials are available in continuous roll form and four firmness grades — soft, medium, firm and very firm — to suit a wide range of applications. While the BISCO RS-800 series is a cellular silicone sponge alternative to BISCO HT-800, there are some differences between the two products. See sell sheets for a complete comparison of material properties.


  • Meets UL94 V-0 and HB
  • Rated for constant use up to 205°C (401°F)
  • Rated for low temperature embrittlement point of -55°C (-67°F)
  • Seals against water at conditions as low as 20% compression
  • Available from 3.18 to 6.35 mm (0.125 to 0.250 in)


  • Designed to withstand the harshest applications and most extreme conditions
  • Will not contribute to a fire due to flame resistance properties
  • Superior silicone properties enable consistent performance over long periods of time
  • Improved manufacturing efficiency through continuous roll die-cutting, enabling better yields
  • Our trusted technical service team is ready to help determine the best material solution for your application needs



Explore our calculators, conversion tools, technical papers and more.

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