Rail SD & SD-C Washers

CB Frost are an established UK manufacturer of sponge, foam, and rubber washers.

The materials we covert from sheeting to Washer are either closed cell, open cell, semi-closed cell sponge, foam, or solid rubbers.

Washers can be produced in a variety of manufacturing processes including Die Cut, Water Jet Cut and Kiss cut. All services CB Frost cater for.

Washers are packed securely into suitable packaging and labelled in accordance with our customer requirements. Additional packing options such as barcoding, individual polybag, and cardboard separation are also available.

CB Frost also offer the possibility of a door to door service providing our customers with the peace of mind that items will arrive safely, securely and in time.

CB Frost has teamed up with Armacell to provide highly flexible, closed cell insulation foam with improved fire-retardant properties, low smoke generation and a built in Microban antimicrobial protection.

Armaflex Rail SD is the first flexible closed cell insulation foam with integrated fire protection for the railway industry. All Armaflex rail products conform to the European fire protection standard EN45545-2 and are the first to achieve Levels HL2 and 3 R1.

Armaflex Rail SD-C insulation foam provides reliable, long term protection against energy loss and condensation. The material has a factory applied silver metallic coating for increased hygiene requirements.


Tooling continues to be very important in the manufacture of die cut washers. Thanks to the company's long-standing history, we work with a variety of well-established tool makers in the West Midlands region.

Adhesive backed Rail SD & SD-C Washers

CB Frost can apply a pressure sensitive adhesive to either one or both faces of Armaflex Rail SD foam. We stock a wide range of synthetic and acrylic tapes, our adhesive tapes come with an easy peel release liner which you simply remove to expose the adhesive. This face is then placed on to the substrate and firmly pressed to obtain the bond.


Our lead-time to supply plain Armaflex Rail SD & SD-C washers is 10/14 working days. Adhesive backed Armaflex Rail SD & SD-C washers is 7-10 days, however CB Frost are flexible and work with our customers to ensure we meet their expectations.

Armaflex Rail SD-C Insulation Foam Washer Capabilities

CB Frost produce large amounts of Armaflex Rail SD-C foam washers every year and cater for small, medium, and large runs. Our manufacturing range includes Die Cut, Water Jet cut, Kiss cut, and High-Speed cutting processes providing our customers with a vast array of options dependent on the applications requirements.

Armaflex Rail SD-C foam washers are manufactured at our site in Nechells, Birmingham based in the West Midlands.

Available in Grey with an adhesive backing already applied in the following thicknesses.


Armaflex Rail SD-C Foam thicknesses

6mm, 9mm, 13mm, 19mm and 25mm

Free of charge Armaflex Rail SD & SD-C Foam samples

CB Frost will supply free of charge a small sample of Armaflex Rail SD foam to your required thickness for testing before committing to an order.


  • Plain or adhesive backed Washers

  • Double sided adhesive backed Washers

  • Kiss Cut Washers (Supplied on a roll)

  • Water Jet Cut Washer when using a thicker material

  • EN45545-2 Approved

  • Condensation Control

  • LUL Approved

  • Closed Cell Insulation Material


Rail SD & SD-C Gaskets

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Rail SD & SD-C Strip

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Rail SD & SD-C Sheeting

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Our Partners

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