HT800 Silicone Foam

CB Frost are a UK preferred convertor of the BISCO range of silicone-based foams and have a relationship with Rogers Corporation extending over 30 years.

HT800 Silicone foam is medium cellular foam material with excellent compression set, memory, and low stress relaxation properties. Due to its compression set, HT800 commonly reduces the maintenance costs involved with gasket failure.

Due to its excellent resistance to Ultraviolet light and ozone, combined with a considerable low and high temperature range, HT800 Silicone foam sheeting is commonly used to reduce shock, isolate vibration and provide protection against wind driven rain and fire in various outdoor communications, electronics and lighting enclosures.

HT800 Silicone foam sheeting is Fire Safe – approved to BS6853 Cat 1A, EN45545, UL94 approved to V-0 and HF-1 and is approved by and commonly utilised in the London Underground.

Typical rail applications include anti-rattle seals, gap fillers, enclosure seals, HVAC, and access panel seals.

HT800 Silicone Foam thicknesses

0.8mm, 1.6mm, 2.4mm, 3.2mm, 4.8mm, 6.4mm, 9.5mm and 12.7mm as standard

Fire Classification  

R1 – Interiors Primary

R2 – Interiors Limited Use

R3 – External Features

R7 – External Features

R8 – External Roof Features

R9 – Bogies Rubber Elements

R10 – Flooring Components

R22 – Interior Seals

R23 – Exterior Seals


HL1 (0.79mm)

HL2 (0.79mm) & HL3 (12.7mm)

HL2 (0.79mm) & HL3 (12.7mm)

HL1 (0.79mm)

HL3 (12.7mm)

HL3 (2.4 – 12.7mm)

HL3 (2.4 – 12.7mm)

HL3 (0.79 – 12.7mm)

HL3 (0.79 – 12.7mm)

BS6853 Cat 1a Table 7 & 8
UL94 V0 + HF1
Specification Typical Values
Polymer: Silicone
Structure: Semi-Open Cell
Colour: Black/Grey
Density: 352kg/m3
Temp: -55/+200 °C

**Data as per our current stock grade


  • BS6853 Cat 1A approved

  • LUL approved

  • EN45545-2 approved

  • Low compression set

  • High/low temperature resistance

  • UL94 V-0 and HF-1

  • IP65, IP66 and IP68 approved in application

  • FDA approved (grey only) 21 CFR 177.2600

Manufacture Capabilities:

  • Gaskets

  • Strip

  • Washers

  • Sheeting

  • Fabrication

Our Partners

Dependable on-time
Full lot traceability on
raw material
Rapid lead times on tooling
and products
Manufacturing services from 1-off
to mass production
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Office Hours

Monday to Thursday
8.00am to 4.35pm
Friday - 8.00am to 1.00pm

Get in touch

Unit C1, Matrix Point, Mainstream Way, Nechells, Birmingham: UK: B7 4SN