What You need to Know About the EN45545-2 Requirement for Rail

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The European railway standard for fire safety EN45545 was introduced as a mandatory requirement throughout Europe. Today, all materials used in rail vehicle manufacturing must follow the EN 45545-2 standard to achieve the highest level of safety possible in the event of a fire.

Existing UK fire regulations such as BS 6853 can no longer be used to prove the compatibility of fire behaviour. The European safety standard EN45545 aims to protect passengers and staff against onboard fire incidents in railway vehicles.

The standard affects manufacturers of rail vehicles including high speed trains, regional trains, trams, Metros and double decker trains.

EN45545-2 requirements for materials and components

railway vehicles

Part two of the European standard; EN45545-2 defines tighter requirements for the fire behaviour of materials and components including flooring, seats and cables on railway vehicles.

This part specifies the test methods, test condition and reaction to fire performance requirements.

Adhesives and potting materials for components must be tested and be compliant with the requirement. It is important that the user finds out the product requirements for their application.

Products are classified according to 26 requirement sets (R1-R26) depending on where the materials are used. Each requirement has a corresponding series of test performance criterias.

Examples of product requirements:

  • R1 requirements for horizontal / vertical interior surfaces, e.g. ceiling and walls, window frames or display screens.
  • R22 / 23 requirements for interior seals, inductance coils, coils and contacts.
  • R24 / 25 requirements for printed circuit boards
  • R26 requirements for small electronic products

Hazard Levels

Railway vehicles are classified in accordance with the fire hazard level associated with their design and operation. There are three hazard levels; HL1, HL2 and HL3 with HL1 being the lowest requirement and HL3 being the highest.

The classification depends on how many kilometres the trolley is in tunnels and whether it is automatic, two-storey or if sleepers are on board.


A series of tests are used to measure how the product compares to the product requirement sets. Some test methods include:

  • TO1 Oxygen Index
  • 03 Flue gas density
  • T12 Smoke toxicity

Key parameters that are measured include flame spread, ignitability, heat release, smoke opacity and toxicity. Having passed the tests, the adhesive, sealant and product for moulding and protecting electronics are given approval according to EN 45545-2 for use in trains. A test report will indicate which tests the adhesive and/or punching material has been approved.

How to select rail components 

  1. Determine which product requirements apply (R1-R26)
  2. Determine the fire hazard level (HL1-HL3)
  3. Identify a suitable material that meets the above ratings and the technical requirements for the application.

Antala can recommend suitable products that meet your requirement set and that has been tested and approved according to EN 45545-2.

For the latest news on EU rail directives, please visit the European Commission website.

Products that meet EN 45545-2


DOWSIL 7091 is a one part silicone adhesive and sealant that is used for applications that require a durable, yet flexible bond.

  • HL1/R22
  • HL2/R23
  • HL3/R24

DOWSIL 3-6548 RTV foam

DOWSIL 3-6548 is a two part flame retardant silicone foam for compression gaskets.

  • HL3/R22

Contact us for assistance in selecting the right adhesive for your rail application.

The information provided on this page is intended as a guide and we recommended that you consult a technical adviser for individual recommendations and advice on rail applications.

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EN 45545 Railway Applications

This white paper examines the european standard EN 45545 Fire protection for passenger railway vehicles.