Extra-Firm Silicone Foam HT-840

HT-840 is an extra-firm grade silicone foam that offers improved durability and sealing with a higher tear and tensile strength. It is used to seal and protect various outdoor communication, lighting, and electronic enclosures from small dust particles, wind driven rain, and fire. BISCO® Silicones are available in various thicknesses and manufactured in roll form to allow fabricators to easily convert the material to the proper dimensions.

  • Excellent memory and low stress relaxation reduces maintenance costs associated with gasket failures due to compression set and softening
  • Resistance to ultraviolet light, ozone, extreme temperatures, and flame enables consistent performance in all environments
  • Compact cell structure provides improved sealing performance