Rail ZH & ZH-C Gaskets

Armaflex® Rail ZH & ZH-C halogen free sponge is the world’s first flexible closed cell insulation to meet EN45545-2 fire protection requirements.

It is the leading and most innovative closed cell thermal insulation available to the railway industry worldwide and comes complete with a built-in vapour barrier reducing the risk of corrosion under insulation (CUI). Armaflex® Rail ZH & ZH-C has been developed to produce extremely low smoke density and reduce the risk of mold and mildew contributing to an improved indoor air quality.

Armaflex® Rail ZH

Available in tubes, plain and self-adhesive sheets, and self-adhesive tapes


Protective halogen free insulation to reduce corrosive effects and smoke toxicity in case of a fire


Low smoke density, superior fire behaviour


Extremely low smoke density and superior fire behaviour


Low thermal conductivity, high tech insulation with built-in fire protection for railway vehicles


Complies with international railway standard for insulation material EN45545-HL2, R1

Armaflex® Rail ZH-C

Available in pre-covered tubes, pre-covered self-adhesive sheets, and self-adhesive tapes


Halogen free insulation reduces toxicity and corrosive effects on people and equipment in case of fire


Resistant to UV, salt water and chemicals


Wash down waterproof and easy to clean


Factory applied reinforced coating with silver finish for hygiene area requirements


Complies with international railway standard for insulation material EN45545-HL3, R1


HVAC Systems Reduce Energy Loss

Pipes reduce energy loss and protect against frost

Lavatory Modules


At CB Frost we can supply as follows:

  • As standard, Armaflex® Rail ZH & ZH-C sponge is available in colour dark grey

  • CB Frost manufacture all sizes of Armaflex® Rail ZH & ZH-C sponge gaskets using roll stock material

  • Armaflex® Rail ZH & ZH-C sponge gaskets can be supplied in any shape from simple rectangular, square, or circular designs to more complex shapes with holes, cut-outs, radius, and angled corners

  • Armaflex® Rail ZH & ZH-C sponge gaskets with a thickness of 3mm to 10mm would be manufactured on our overhead, swing arm or kiss-cutting presses

  • Armaflex® Rail ZH & ZH-C sponge gaskets above 10mm thick would be water jet cut ensuring all edges of the gasket are flat and not concaved to give a correct fit

  • We cater for custom one offs to full volume productions

  • We can supply all Armaflex® Rail ZH sponge gaskets plain or with a single sided self-adhesive backing

  • We can only supply Armaflex® Rail ZH-C sponge gaskets with a single sided self-adhesive backing

ArmaFlex Rail ZH Continuous sheets (Rolls)

Code Thickness (mm) Roll Length (m) m2/carton
RA-03-99/E 3.0 30 30
RA-06-99/E 6.0 15 15
RA-09-99/E 9.0 10 10
RA-13-99/E 13.0 8 8
RA-19-99/E 19.0 5 5
Length tolerance for tubes ± 1.5%
Thickness Tolerance 3 – 6mm ± 1.0mm
9 – 19mm ± 1.5mm
Reaction to Fire Hazard Level 2, R1 according to EN45545-2
3mm sheets: HL3, R1

For more information or advice

call us today on +44 (0) 121 773 8494

We have the capabilities to convert Rail ZH & ZH-C Gaskets into various shapes/strips/tapes etc, please click on the below for further details or visit our products section within the website.


Rail ZH & ZH-C Strip

View Product


Rail ZH & ZH-C Sheeting

View Product


ZH & ZH-C Washers

View Product


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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