Silicone Sponge Solutions for EN45545-Compliant Rail Applications
At PREMSIL, we manufacture high-performance silicone sponge rubber designed to meet the demanding fire, safety and durability requirements of the rail and mass transit industry.
Our materials and components are engineered to support compliance with EN45545 R22/23, while delivering reliable long term sealing performance across a wide range of applications.
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EN45545-2 (R22 / R23 to HL2)
Low smoke & toxicity
-50°C to +200°C
In-house extrusion & conversion
RG250 is our dedicated rail grade silicone sponge, developed for applications requiring a balance of fire performance, durability, and sealing efficiency.
RG250 is suitable for both interior and exterior sealing applications across rail vehicles.
| Technical Data | Value | Test |
|---|---|---|
| Appearance | Black/Grey | – |
| Density | 250 kg/m³ (±60) | ASTM D 1056 |
| Compression force deflection @ 25% strain | 45 kPa | ASTM D 1056 |
| Compression force deflection @ 40% strain | 100 kPa | BS EN ISO 3386 Pt. 1, 2 |
| Compression Set @ 100°C, 22 hrs | <5% | ASTM D 1056 |
| Water Absorption | <5% | ASTM D 1056 |
| LOI | 31.5% | ISO 4589-2 |
| Smoke Toxicity (CITNLP) | 0.05 | NF X 70-100 |
| Smoke Density (Ds max) | 89 | ISO 5659-2 |
| Temperature range | -50°C min / +220°C max | – |
EN45545 defines how materials should perform in the event of fire within railway vehicles.
For sealing materials, this typically involves:
Each application is assigned a hazard level (HL1, HL2 or HL3) based on factors such as passenger exposure, location, and fire risk.
Correct material selection is about matching performance to the application, ensuring:
Silicone sponge is widely used across rail systems where reliable environmental sealing and fire performance are required.
Typical Applications
Door Seals: Reliable environmental sealing with low compression force for consistent door closure performance.
Window Sealing: Effective sealing around window assemblies, preventing water ingress and accommodating movement and tolerances.
HVAC Systems & Air Plenums: Ensures effective air sealing and thermal insulation within ducting and air handling systems.
Electrical & Equipment Enclosures: Protects enclosures against dust, moisture and environmental ingress.
Lighting & Display Gaskets : Delivers durable sealing for lighting housings, maintaining performance in exposed conditions.
Roof & Panel Sealing: Enables consistent sealing between panels and structures, accommodating surface irregularities.
Gap Filling : Compressible material ideal for filling voids and maintaining long-term sealing in variable gaps.
Vibration Isolation: Provides cushioning and damping to reduce vibration transfer and protect components over time.
These applications often require low compression force sealing, rather than high-pressure sealing, making silicone sponge an ideal solution for consistent long-term performance.
We manufacture a range of silicone sponge products and convert into a range of finished components:
Extruded strips & profiles (custom to drawing)
Die-cut gaskets
Joined frames and O-rings
Sheet material
PSA-backed components
All products are manufactured in-house, allowing us to maintain control over quality, lead times and consistency.
We work closely with customers to ensure the right material and geometry are selected for each application.
For more detailed information on RG250, including material data, fire performance, and application guidance:
Download Rail Brochure