HT-840 | NS-160 | Extra Firm Silicone Foam | National Silicone

NS-160 Extra Firm Silicone Foam

Cellular Silicone Foam

This extra firm silicone foam is designed to provide exceptional sealing capabilities and is extremely durable when tested in the most intense weather conditions. It is a direct comparable to Rogers Bisco® HT 840 cellular foam material.

It offers FDA compliance for repeated use in contact with food, with a higher tear and tensile strength, and works great in all weather conditions.

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  • Highly adaptable to various applications and environments
  • Enhanced sealing capabilities
  • Low closure force
  • Flame retardant
  • Excellent compressibility
  • UV/Ozone resistant





Available in – Continuous rolls or cut sheets
Thickness available (in) – 0.0625 to 0.500
Roll lengths available (ft) – *16.4 – 65.6, depending on thickness
Typical roll widths (in) – *34 (for 0.0625 to 0.03125)
Typical roll widths (in) – *18 (for 0.125″ to 0.500)
Surface finishing – Smooth finish, both sides
Cell structure – Closed cell
Color -Grey, Black, *White, *Red
*Subject to MOQ

* Download roll size guide



-67°F to +392°F  (-55°C to 200°C)



Compression deflection (25%) psi (kPa) 29 (200) ASTM D1056
Density pcf (kg/m3) 34 (550) max. ASTM D1056
Compression set (22h, 100°C) % < 1 ASTM D1056
Tensile strength psi (kPa) 87 (600) ASTM D412
Flammability V-0 rating UL 94

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National Silicone 88-NS160 Extra Firm Foam

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More Information

UL 94 V-0

  • UL 94 V-0 is a safety and flammability standard by Underwriters Laboratories.
  • This material is compliant with the UL 94 V-0 test standard for flammability.
  • The vertical burn test measures the self-extinguishing time of a vertically oriented polymer specimen. The test evaluates both the burning and afterglow times and dripping of the burning test specimen.
  • In order to be rated UL 94 V-0, the burning must stop within 10 seconds, no flame propagation or dripping.

21 CFR 177.2600

  • 21 CFR 177.2600 is a specification from the U.S. Code of Federal Regulations (CFR) used by the Food and Drug Administration (FDA).
  • This material is compliant with the requirements of 21 CFR 177.2600.
  • The specification covers rubber articles intended for repeated use and may be safely used in producing, manufacturing, packing, processing, preparing, treating, packaging, transporting, or holding food, subject to the provisions of this section.
  • Meaning this material is generally recognized as safe, and can be used in applications where repeated use in contact with food occurs.




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