Please see our LATEST NEWS for information about current raw material shortages and price increases

HT800 Flame Retardant Silicone Sponge Sheet

HT800 offers the lightness of a sponge combined with the superior sealing capabilities of traditional silicone. This foam is ideal for protecting and sealing outdoor communication, electronics and lighting enclosures. It can also be used for vibration dampening. HT800’s memory and low stress relaxation makes it ideal for gasketing, and its Ozone, UV and extreme temperature resistance make it suitable for use in all environments. 

Its cell structure prevents penetration by particles or water. Applications include, but are not limited to door seals, HVAC systems, lighting housing gaskets, gap fillers, vibration dampening and electrical display gaskets in the rail industry, gaskets, anti-vibration cushioning, HVAC systems, anti-fogging seals, battery pads/cushions and air bag seals in the automotive industry and sound dampening, window panel seals, gap fillers, HVAC systems and thermal insulation in the aerospace industry.

You are buying a minimum of 1 linear metre (915mm wide). Multiple orders will be supplied in a continuous roll.

From: 49,82 Inc. VAT 49,82 Ex. VAT


We can produce this product in almost any size or colour. If you can't find what you're looking for enquire now

Add adhesive backing

Please allow an additional 5 working days shipping

Product price:49,82
Total options:
Order total:
Enquire Now

Details & Specs


BISCO HT-800 Medium Cellular Silicone is a versatile, medium firmness silicone. HT-800 silicone foam leads the market in sealing and protecting outdoor communication, electronics and lighting enclosures. HT-800 silicone foam’s superb memory and low stress relaxation reduces maintenance costs from gasket failures caused by compression set and softening. Its compact cell structure and unique formulation provide enhanced sealing against penetration from fine particles and wind-driven rain and fire. It also offers shock reduction and vibration isolation in electronic components and transportation vehicles.


  • Compact cell structure and unique formulation
  • Available in thicknesses from 0.031 to 0.500 in.
  • Typical density of 22 PCF
  • CFD range of 6-14 PSI
  • Resistant to UV, ozone, extreme temperatures and flame


  • FDA compliant
  • Offers consistent performance in all environments
  • Excellent memory and low stress relaxation
  • Reduces maintenance costs associated with gasket failures due to compression set and softening


Chemical Resistance

Availability and Fabrication Possibility

  • can be water jet cut or punched into gaskets
  • FDA compliant in grey
  • UL94V0 Compliant for usage were flame retardancy is needed
  • Certified for use in Railway or Aerospace applications
  • PSA Options available
  • Can meet IP Class certifications
  • Automotive, HVAC, LCD and LED Display applications

Can we help you?

If you’d like to discuss your idea, requirements or application with a member of our technical team, fill out the form below or contact us.
  • Choose File
    Max. file size: 64 MB.
  • Telephone Number:
    0049 (0)6201 259040
  • This field is for validation purposes and should be left unchanged.