HL3
Compliant EN 45545-2
Fire Retardant Rubber
India's trusted HL3 compliant EPDM / SILICON rubber manufacturer — certified to the most stringent fire-protection standard for railway vehicles. Precision-compounded fire Retardant rubber profiles, rubber gaskets and compounds engineered to protect lives across India's rail network and global transit infrastructure.
Compliance Matters
In mass transit and railway engineering, compromise is never an option. EN 45545-2 governs fire protection behavior of all materials and components inside railway vehicles. As a certified HL3 compliant EPDM / SILICON rubber manufacturer, Gayatri Rubbers supplies fire retardant / flame retardant rubber compounds and extruded profiles that meet procurement requirements for Indian Railways, metro systems, and global rolling stock integrators.
The HL3 (Hazard Level 3) classification is the most stringent tier under EN 45545-2 HL3 rubber standards — mandatory for trains operating in extended underground tunnels, sleeping cars, and high-capacity transit corridors where evacuation time is longest.
View All CertificationsLow Flame Spread
Strictly restricts fire propagation across the material surface, containing the source before it can cascade into a life-threatening blaze.
Low Smoke Density
Dramatically reduces smoke emission to keep evacuation corridors and emergency exits visible, safeguarding passenger lives during critical seconds.
Minimal Gas Toxicity
Prevents the release of lethal halogenated and acid gases during combustion — a critical factor in enclosed underground environments.
Highest Safety Tier
HL3 sits at the apex of the EN 45545-2 framework — the absolute benchmark that all safety-critical railway procurement now demands globally.
Choosing the right flame retardant rubber for rail and mass-transit projects starts with understanding the standard that governs it. Here is a plain-English guide to EN 45545-2, the HL3 hazard level, and why fire-safe elastomers save lives.
What is EN 45545-2?
EN 45545-2 is the European standard for the fire behaviour of materials and components used inside railway vehicles. It replaced a patchwork of national standards and now defines uniform requirements for how every interior and exterior material — including rubber profiles, seals and gaskets — must perform when exposed to fire. Materials are assessed against a set of "R-requirements" (R1–R26) that map to where and how the part is used, covering flame spread, heat release, smoke opacity and toxic gas emission. Any rubber destined for modern rolling stock in India or abroad is now expected to demonstrate documented EN 45545-2 rubber compliance.
What is HL3 (Hazard Level 3)?
EN 45545-2 classifies materials into three Hazard Levels — HL1, HL2 and HL3 — based on the operational risk of the vehicle. The level rises with how difficult it is for passengers to escape: double-deck vehicles, sleeping cars and, above all, trains running in long underground tunnels and metro systems demand the highest tier. HL3 is the most stringent classification, so HL3 rubber must satisfy the toughest limits for flame spread, smoke and toxicity. As an HL3 compliant rubber manufacturer, GRCL formulates every safety-critical compound to meet this apex benchmark.
Why Flame Retardant Rubber Matters
In an enclosed carriage or underground station, the biggest threat in a fire is rarely the flame itself — it is smoke and toxic gas that reduce visibility and incapacitate passengers within seconds. Standard rubber ignites easily, sustains burning and releases dense, poisonous smoke. Flame retardant rubber is engineered with halogen-free flame retardants, smoke suppressants and char-forming additives so that it self-extinguishes, emits minimal smoke and keeps toxic gas concentrations low. That difference directly extends the "available safe egress time" that lets people evacuate — which is exactly why railway procurement now mandates fire resistant rubber at the HL3 level.
Low Smoke Density
Our compounds are tested to ISO 5659-2 for optical smoke density (Ds max), keeping escape corridors and emergency exits visible during the critical first minutes of a fire.
Low Toxicity
Toxic gas emission (CITG) is measured to NF X 70-100 and held well below the HL3 threshold, limiting the CO, HCN, HCl and SO₂ released during combustion.
Fire Resistance
A limiting oxygen index of ≥ 32% (ISO 4589-2) means our rubber will not sustain a flame in normal air, resisting ignition and slowing flame spread across the surface.
Rubber Gasket Manufacturing at HL3 Grade
A Rubber Gasket is the single most safety-critical sealing component in a rail vehicle — it keeps doors, windows, roof hatches, HVAC ducts, battery boxes and electrical enclosures airtight and watertight, and in a fire it must not become the path that lets flame and smoke travel between compartments. As a specialist rubber gasket manufacturer in India, Gayatri Rubbers & Chemicals Ltd produces moulded and extruded rubber gaskets in EPDM, Silicone, Neoprene and Nitrile — every compound formulated to the same halogen-free, low-smoke, low-toxicity chemistry as our HL3 profiles. Each fire retardant rubber gasket is manufactured to customer drawings, dimensionally verified, and supplied with EN 45545-2 HL3 test certificates from our NABL-accredited lab. Whether you need a custom rubber gasket for rolling stock, an industrial EPDM rubber gasket for process equipment, or a high-temperature silicone rubber gasket, we tool, compound and mould it in-house — from prototype samples to full production volumes. Explore our rubber gasket range or request a gasket quote.
How HL3 Rubber Is Tested
Certifying a compound as HL3 compliant means passing the EN 45545-2 test suite mapped to the relevant R-requirement: lateral flame spread (ISO 5658-2), heat release rate (ISO 5660-1 cone calorimeter), optical smoke density (ISO 5659-2) and toxic gas analysis (NF X 70-100), supported by oxygen-index and halogen-content checks. GRCL runs all primary fire, smoke and toxicity (FST) tests in its NABL-accredited laboratory, giving customers full traceability from raw compound to finished fire resistant rubber profile.
Our R&D team custom-formulates EPDM, Silicone, and Neoprene elastomers to achieve optimal balance between mechanical durability and HL3 compliant fire retardant rubber properties. Every compound is validated in-house against EN 45545-2 HL3 requirements before manufacturing any fire resistant rubber profiles.
| Property | Test Standard | GRCL 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 | Well below maximum allowable threshold | PASS |
| Hardness Range | Shore A | 50 to 85 (Fully Customizable) | PASS |
| Temperature Resistance | Continuous Operation | Optimized for severe climate variations | PASS |
| Tensile Strength | ISO 37 | Meets full mechanical duty requirements | PASS |
| Halogen Content | EN 14582 | Halogen-free compound available | PASS |
Every EN 45545-2 HL3 rubber compound that leaves our facility undergoes rigorous in-house fire, smoke, and toxicity testing — backed by advanced laboratory infrastructure you can trust. Our Inhouse lab is what makes us a reliable HL3 compliant rubber manufacturer for rail projects worldwide.
Our railway fire retardant rubber components, rubber gaskets and fire resistant rubber profiles are engineered for interior, exterior, and structural applications across high-speed trains, metro systems, locomotives, and light-rail vehicles — fully certified to EN 45545-2 HL3.
View All ProductsWindow & Door Seals
Airtight, weatherproof, and fire-safe sealing profiles for all rolling stock door and window systems.
Gangway & Bellow Seals
Flexible, high-fatigue resistant connecting joints between railway coaches and metro cars.
Rubber Gaskets
Moulded and extruded rubber gasket sets in EPDM, Silicone, Neoprene and Nitrile — sealing doors, hatches, HVAC ducts and electrical enclosures to EN 45545-2 HL3.
Anti-Vibration Mounts
NVH (Noise, Vibration & Harshness) damping elements that absorb shock without compromising fire safety.
Cable Grommets & Insulation
Protecting critical electrical conduits from fire spread across the entire train body.
Rail Pads & Under-Sleeper Pads
Load-bearing fire-retardant pads meeting RDSO specifications for Indian Railways track infrastructure.
Custom Extruded Profiles
Bespoke HL3 fire retardant rubber profiles and molded components machined to your exact blueprints and tolerances — supplied as a certified HL3 compliant rubber manufacturer.
Railway Applications
GRCL supplies railway flame retardant rubber for mainline coaches, locomotives and freight stock — door and window seals, gangway bellows, anti-vibration mounts, rail pads, under-sleeper pads and cable grommets. We manufacture 65 of the 75 rubber components used in a modern railway coach, all built to RDSO drawings and EN 45545-2 HL3 fire safety.
Metro Applications
Underground metro systems represent the highest fire-safety risk, which is why they mandate HL3. Our fire resistant rubber profiles for metro cars — sealing, bellows and insulation — are validated for the low smoke and low toxicity performance essential to safe evacuation in enclosed tunnels and platforms.
Custom Manufacturing
From compound development to precision extrusion and moulding, we produce bespoke HL3 profiles to your exact blueprints and tolerances. Our R&D team tailors Shore-A hardness, tensile strength and elongation while preserving certified flame retardant performance.
Indian Railway & International Compliance
We hold RDSO-approved vendor status for Indian Railways and export EN 45545-2 HL3 rubber to rail integrators across Europe, the Middle East and Southeast Asia. Full material datasheets, test certificates and third-party validation reports are provided to satisfy Tier-1 procurement worldwide — backed by ISO 9001:2015, IATF 16949 and NABL accreditation.
Common questions from rolling stock OEMs, rail integrators and procurement teams sourcing EN 45545-2 HL3 rubber and fire resistant rubber profiles.
What does it mean to be an HL3 compliant rubber manufacturer?
Being an HL3 compliant rubber manufacturer means our rubber compounds and profiles meet the most stringent fire safety classification under the EN 45545-2 standard — Hazard Level 3 (HL3). This is the highest level of fire protection required for railway rolling stock operating in the most densely populated or safety-critical environments, such as underground metro systems and high-speed rail. At Gayatri Rubbers & Chemicals Ltd, every HL3-grade product is validated for flame spread, smoke density, and toxic gas emission through our in-house NABL-accredited testing lab.
What is EN 45545-2 and why is HL3 the most demanding classification?
EN 45545-2 is the European standard governing fire protection of railway vehicles. It classifies materials across three Hazard Levels — HL1, HL2, and HL3 — based on the type of rail service and the escape difficulty for passengers. HL3 applies to the highest-risk scenarios: tunnels, underground metros, and vehicles where evacuation time is longest. Our EN 45545-2 HL3 rubber compounds are formulated and tested to satisfy all applicable R-requirements (flame spread, heat release, smoke opacity, and toxicity) at this top-tier classification.
Which types of fire resistant rubber profiles does Gayatri Rubbers supply?
We manufacture a comprehensive range of fire resistant rubber profiles under the HL3 classification, including door and window sealing profiles, gangway and bellows seals, anti-vibration mounts, cable grommets, under-sleeper pads, and custom extruded sections. All profiles are available in EPDM, Neoprene, Silicone, and Nitrile formulations engineered specifically to meet EN 45545-2 HL3 requirements. Browse the full range of rubber profiles.
Do you manufacture Rubber Gaskets, and in which materials?
Yes. Gayatri Rubbers & Chemicals Ltd is a full-service rubber gasket manufacturer, producing moulded, extruded and die-cut rubber gaskets in EPDM, Silicone, Neoprene, Nitrile and Natural Rubber. Every custom rubber gasket is made to your drawing or sample, with hardness, compression set and temperature range tuned to the application — and for rail and metro work, compounded to EN 45545-2 HL3 fire, smoke and toxicity limits. Send us a drawing to get a rubber gasket quote.
Is your railway fire retardant rubber approved for Indian Railways (RDSO)?
Yes. Our railway fire retardant rubber products are manufactured under RDSO-approved vendor status, in addition to being certified to EN 45545-2 HL3 for international projects. We are a strategic supplier to Indian Railways for critical rubber components including rail pads, buffer stops, and anti-vibration elements. Our quality management system holds ISO 9001:2015 and IATF 16949 certification, and our testing lab is NABL-accredited — see our certifications.
How is HL3 fire retardant rubber different from standard rubber?
Standard rubber compounds will ignite, sustain a flame, and release dense smoke and toxic gases when exposed to fire. HL3 fire retardant rubber is compounded with halogen-free flame retardants, smoke suppressants, and char-forming additives that — even under extreme heat — self-extinguish rapidly, emit minimal smoke, and produce low levels of toxic combustion gases (CO, HCN, HCl, SO₂). This chemistry is critical for passenger survival time in enclosed spaces such as tunnels and underground stations.
Can you supply EN 45545-2 HL3 rubber for metro and light rail projects outside India?
Absolutely. Our EN 45545-2 HL3 rubber compounds and extruded profiles are exported to rail integrators and OEMs across Europe, the Middle East, and Southeast Asia. We provide full material datasheets, test certificates, and third-party validation reports to meet the procurement requirements of Tier-1 global rolling stock manufacturers.
What tests are conducted to certify a rubber compound as HL3 compliant?
To certify rubber as HL3 compliant, compounds must pass EN 45545-2 requirements mapped to the relevant R-requirement group (R1–R26). Key tests include: lateral flame spread (ISO 5658-2), optical smoke density (ISO 5659-2), heat release rate (ISO 5660-1), and toxic gas analysis (NF X 70-100). At Gayatri Rubbers, we run all primary FST (Fire, Smoke & Toxicity) tests in our NABL-accredited laboratory, providing customers with full traceability from raw compound to finished profile.
How do I request a sample or technical datasheet for your HL3 fire retardant rubber products?
You can request material samples, test certificates, or technical datasheets for our HL3 fire retardant rubber and fire resistant rubber profiles by contacting our engineering team at sales@gayatrirubberchemicals.com or calling +91 97669 35377. You may also use the contact form on our website and our technical team will respond within one business day.
Partner With Railway Fire Retardant
Rubber Experts
Secure your mass transit projects with EN 45545-2 HL3 rubber profiles that don't just meet standards — they set them. Whether you need fire resistant rubber profiles for metro sealing, gangway bellows, or custom extrusions, discuss your material requirements or request technical datasheets from our certified engineering team today.
- Custom compounding and extrusion for exact specifications
- End-to-end in-house fire, smoke & toxicity testing
- ISO 9001:2015 · IATF 16949 · RDSO · NABL certified
- Scalable supply ready for global Tier-1 integrators