Sections

Latest News

News 4 Aug 2026

Die-Cut vs. Waterjet Cut Silicone Gaskets

What’s the best choice for your production run? Selecting the right material is critical for manufacturing high-performance seals, but how...

News 23 Jun 2026

Rolling Stock Networking: Connect with CB Frost at RSN 2026

At CB Frost & Co, we don’t believe in waiting around when a great opportunity knocks. That is exactly why...

Gap Fillers

Rail

BISCO® HT800 Silicone Foam

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 maintenance costs involved with gasket failure as many other materials will take a set when under compression and can lead to failure if the seal is disturbed. Further beneficial properties are its excellent resistance to ultraviolet light and ozone, as well as effective resistance to extreme temperatures, both low and high. These characteristics mean that HT800 is well suited for indoor and outdoor applications.

HT800 Silicone foam is Fire Safe – approved to EN45545-2, BS6853 Cat 1A, UL94 approved to V-0 and HF-1 and is approved by and commonly utilised by TFL on the London Underground.

BISCO® BF1000 Silicone Foam

BF1000 Silicone is a soft cellular Silicone foam material and is supplied in white as standard. BF1000 Silicone foam is an ideal choice for gap filling as the material can be compressed into awkward gaps and shapes due to its compressibility, lightness and durability. It has excellent memory and low stress relaxation, and the softness of the material means that less force is needed to seal.

Its exponential resistance to UV light and ozone, combined with an excellent low and high temperature range. BF1000 Silicone is commonly used on outdoor applications, such as sealing enclosures effectively up to IP66 and IP67 shielding from heat and the elements, protecting electronics from shock and providing cushioning and vibration for a wide variety of applications.

BF1000 Silicone foam is Fire Safe – approved to EN45545-2, BS6853 and UL94 approved to V-0 and HF-1.

BISCO® BF2000 Silicone Foam

BF2000 Silicone is an Ultra-soft and highly compressible foam material with excellent memory and low stress relaxation properties. Due to its high compressibility, BF2000 Silicone foam can be compressed into awkward gaps and shapes, making it ideal for transportation, industrial and electronic applications where low closure force and dust sealing on doors are critical.

Further beneficial properties of BF2000 Silicone foam are its excellent resistance to ultraviolet light and ozone, as well as effective resistance to extreme temperatures, both low and high. These characteristics mean that BF2000 is well suited for outdoor applications.

BF2000 Silicone foam sheeting is Fire Safe – approved to EN45545-2, BS6853 Cat 1A and UL94 approved to V-0 and HF-1.

Features and Benefits

Temperature independency
UV/ Ozone resistant
Rated to most stringent flame standards

BISCO® MF1 Silicone Foam

BISCO® MF1-55 white silicone foam is used for its superior resistance to compression set and ability to be squashed into small/large voids then recover to its original fabricated shape stopping the spread of smoke through ceiling/panel compartments making it an ideal material to be used as a gap filler.

LSLT EPDM Rubber can be supplied in various forms

LSLT Neoprene Sponge

LSLT (low smoke, low toxicity) neoprene sponge is fully closed cell and conforms to rail specification EN45545-2 (refer to our data sheet for test data). A cost-effective compliant sponge suitable for indoor applications as resistance to UV/Ozone is classed as only being good (HT800, BF1000 or BF2000 Silicone sponge would be more suitable for high UV/Ozone) or where resistance to oils is required.

Has good resistance to abrasion and with a working temperature of -50°C to 110°C LSLT neoprene is a well-suited sponge for various rail applications.

Rail specialists

Explore other rail sectors

With over 40 years of experience within the rail industry, CB Frost & Co is your first-choice partner for an array of rail applications.

Acoustic Barriers

Learn More

Door Seals

Learn More

Gap Fillers

Learn More

HVAC Seals

Learn More

LCD Display Gaskets

Learn More

Lighting Enclosure Gaskets

Learn More

Seating Cushions

Learn More

Smoke Seals

Learn More

Vibration Isolation

Learn More

Partitioning

Learn More

Our vision for the future is to continue to be an efficient, well organised company that produces and supplies quality products, remaining as a market leader, whilst respecting the environment always.

Gap fillers

Gap Fillers sample request

To arrange for a gap filler sample, please fill in your details in the form below.

"*" indicates required fields

This field is for validation purposes and should be left unchanged.