BISCO HT-200 Sound Block materials are made of silicone elastomers specifically designed to both reduce sound transmission within interior spaces and prevent the spread of fire and smoke. These high performance elastomeric materials use a filler technology to solve acoustic, fire and smoke issues for a variety of applications, including railcar subflooring, interior vehicle panels and air ducts. HT-200 materials are supplied in roll form, and are available with or without adhesives and supported backings.


  • Withstands temperatures between -55°C and 250°C (-67°F to 482°F)
  • Complies with international safety standards for mass transit and aerospace
  • Sound transmission can be “tuned” by adjusting the areal density or weight of materials


  • Flame retardant, complying with all international safety standards
  • Good tear strength
  • Excellent resistance to compression set, UV, moisture and cleaning alcohols



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

  • BISCO® Silicones Product Properties Guide

    Filter BISCO product information by various criteria, including property groups, product category or units, to find the best material for the application.

  • Application Design Tool

    Determine the best BISCO® silicone or PORON® polyurethane material for specific design application.

  • Compression Force Deflection Curve Tool

    Identify design-appropriate BISCO silicone, PORON polyurethane and ARLON silicone materials using stress-strain data.

  • Impact Prediction Tool

    Select the best BISCO silicone or PORON polyurethane for energy absorbing applications using impact data.

  • Vibration Isolation Tool

    The Vibration Isolation Tool recommends the proper BISCO® silicone and PORON® polyurethane materials for your vibration mitigation applications.

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