Overview
EN 45545-2 HL3 compliant flame retardant rubber
Our HL3 flame retardant rubber is compounded and processed for the highest fire-safety tier under EN 45545-2 — the standard governing fire protection of materials inside railway vehicles. This flame retardant and fire retardant rubber is supplied as extruded profile, sheet or custom-moulded form to the buyer's specification.
EPDM, Silicone and Neoprene formulations are engineered to balance mechanical durability with low flame spread, low smoke density and minimal toxic gas emission — validated before we manufacture any flame resistant rubber or fire resistant rubber profiles for rail and transit projects.
Why HL3 Compliance Matters
Low Flame Spread
Restricts fire propagation across the material surface, containing the source before it can cascade.
Low Smoke Density
Reduces smoke emission so evacuation corridors and emergency exits stay visible during critical seconds.
Minimal Gas Toxicity
Prevents release of lethal halogenated and acid gases during combustion in enclosed environments.
Highest Safety Tier
HL3 sits at the apex of the EN 45545-2 framework — the benchmark safety-critical rail procurement now demands.
Technical Specifications & Performance
Every compound is validated in-house against EN 45545-2 HL3 requirements before manufacturing.
| Property | Test Standard | Performance | Status |
|---|---|---|---|
| Oxygen Index (OI) | ISO 4589-2 | ≥ 32% (Exceeds HL3 limit) | Pass |
| Smoke Density (Ds max) | ISO 5659-2 | Compliant with critical tunnel limits | Pass |
| Toxicity Index (CITG) | NF X 70-100-1 / -2 | Below maximum allowable threshold | Pass |
| Hardness Range | Shore A | 50 to 85 (Fully customisable) | Pass |
| Tensile Strength | ISO 37 | Meets full mechanical duty requirements | Pass |
| Halogen Content | EN 14582 | Halogen-free compound available | Pass |
Applications in Rail & Transit
Window & Door Seals
Airtight, weatherproof and fire-safe sealing profiles for rolling stock door and window systems.
Gangway & Bellow Seals
Flexible, high-fatigue connecting joints between railway coaches and metro cars.
Anti-Vibration Mounts
NVH damping elements that absorb shock without compromising fire safety.
Cable Grommets
Protecting critical electrical conduits from fire spread across the train body.
Rail & Under-Sleeper Pads
Load-bearing fire-retardant pads for track infrastructure.
Custom Extruded Profiles
Bespoke HL3 profiles and moulded components machined to your exact blueprints and tolerances.
Benefits
—
Custom Compounding
Formulations adjusted to your application rather than a fixed catalogue grade.
—
In-House FST Testing
End-to-end fire, smoke and toxicity testing before any profile is manufactured.
—
Halogen-Free Options
Char-forming, halogen-free chemistry for the lowest toxic gas emission.
—
Export Ready
Full datasheets and test documentation prepared for global rolling-stock integrators.
Industries
Railway
Metro & Light Rail
High-Speed Transit
Rolling Stock OEM
Export
Gallery
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Rubber Gaskets in HL3 Flame Retardant Compounds
Cut, moulded and extruded gasket sections in the same FST-validated compounds as our profiles.
As a rubber gasket manufacturer working to the same fire-safety discipline as our profiles, Elements India supplies HL3 rubber gasket sets for rolling stock and transit interiors. Every EN 45545-2 rubber gasket is compounded and FST-validated before dispatch, so a railway rubber gasket carries the same flame spread, smoke density and toxicity performance as the sealing system around it.
Choose an EPDM rubber gasket for weather and ozone resistance, a silicone rubber gasket for sustained high temperature, or a neoprene rubber gasket where oil and abrasion resistance matter. We cut, mould and extrude each industrial rubber gasket to your drawing, and a custom rubber gasket can be quoted from a sample, a profile section or a dimensioned sketch.
Flange Gaskets
Door & Window Sections
Panel & Housing Gaskets
Cable Entry Gaskets
Custom Profiles
Need HL3 fire retardant rubber to a specific profile or spec?
Inquire About This ProductFrequently Asked Questions
Flame retardant rubber and EN 45545-2 HL3 compliance, answered.
What is EN 45545-2 HL3 fire retardant rubber?
HL3 (Hazard Level 3) is the most stringent fire-safety classification under the EN 45545-2 standard for railway vehicles. Our HL3 flame retardant rubber compounds and profiles are engineered for low flame spread, low smoke density and minimal toxic gas emission — the level required for underground metros, tunnels and high-capacity transit corridors.
Which fire resistant rubber profiles does Elements India supply?
We supply HL3-grade window and door seals, gangway and bellows seals, anti-vibration mounts, cable grommets, rail pads and custom extruded profiles in EPDM, Silicone, Neoprene and Nitrile formulations engineered to EN 45545-2 HL3 requirements.
How is HL3 fire retardant rubber different from standard rubber?
Standard rubber ignites, sustains a flame and releases dense smoke and toxic gases. HL3 fire retardant rubber is compounded with halogen-free flame retardants, smoke suppressants and char-forming additives so it self-extinguishes rapidly, emits minimal smoke and produces low levels of toxic combustion gases — critical for passenger survival time in enclosed spaces.
Is flame retardant rubber the same as fire retardant rubber?
Yes. Flame retardant rubber, fire retardant rubber and flame resistant rubber are used interchangeably to describe a rubber compound engineered to resist ignition, limit flame spread and reduce smoke and toxic emissions. Our HL3 grade meets all three descriptions at the highest EN 45545-2 hazard level.
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