Rail rubber pads for railway track structure are important components in the track structure. They are installed between steel rails and concrete sleepers. Its main function is to buffer the high-speed vibration and impact generated when vehicles pass through the rails, protect the roadbed and sleepers, and provide signal The system is electrically insulated, and the rubber pad is exposed to the atmosphere for a long time, so it is required to have good resistance to natural aging, cold and heat resistance.
A Grooved Rubber Sole Plate (GRSP) in railways is a durable rubber pad placed between the steel rail and the sleeper (tie) to absorb vibrations, reduce shock and noise from passing trains, provide electrical insulation, prevent wear, and increase friction for better rail stability, ultimately extending the life of the track components and ensuring a smoother, safer ride.
What material is used to manufacture the Grooved Rail Rubber Pad ?
Grooved Rail Rubber Pads are primarily made from blends of natural rubber and nitrile rubber (NBR), sometimes reinforced with carbon black, for durability, oil resistance, and shock absorption, with some high-performance versions using polyurethane (PU) or multi-layer composites including steel mesh for heavy loads, while simpler types use HDPE or EVA for less demanding applications, all designed to cushion tracks.
Common Materials Used
- Natural Rubber: Provides basic elasticity and resilience.
- Nitrile Rubber (NBR): Added for enhanced resistance to oils and fatigue.
- Polyurethane (PU): Offers superior wear resistance and longevity.
- EVA (Ethylene-Vinyl Acetate): A common alternative or additive for flexibility and cushioning.
- HDPE (High-Density Polyethylene): Used in some formulations for specific properties.
- Reinforcements: Carbon black improves strength, while steel mesh can be integrated into multi-layer pads for extreme rigidity (e.g., for cranes).
| Rubber Rail Pad | ||
| Technical Parameter | Unit | Value |
| Stiffness | KN | 90-130 |
| Hardness Shore A | ℃ | 72-80 degree |
| Electronic Resistance | Ω | ≥ 106 |
| Tensile Strength before Aging | Mpa | ≥12.5 |
| Elongation before Aging | % | ≥250 |
| HDPE Rail Pad | |||
| Technical Parameter | Unit | Technical Requirement | Value |
| Density | g/cm3 | 0.95-0.98 | 0.95 |
| Tensile Strength | Mpa | ≥19 | 19 |
| Elongation | % | >80 | 150 |
| Melting Point | ℃ | 170-190 | 190 |
| Insulation Resistance | Ω | ≥1×1010 | 3.5 ×1010 |
| Hardness | A | ≥98 | 98(A) |
| EVA: Polyethylene 80%, Vinyl Acetate 20%. | |||
| Technical Parameter | Unit | Technical Requirement | Value |
| Density | g/cm3 | 0.95-0.98 | 0.95 |
| Tensile Strength | Mpa | ≥15 | 16 |
| Elongation | % | >500 | 550 |
| Melting Point | ℃ | 170-190 | 170 |
| Insulation Resistance | Ω | ≥1×1010 | 5.0 ×1010 |
| Hardness | A | ≥90 | 92(A) |
As a professional rubber rail pad manufacturer GNEE RAIL can produce various standards of rubber rail pads and other rail fasteners. If you want to build a railway line, do not hesitate to contact us, we can supply all types of rubber rail pads with different materials. If necessary, we can make customized rubber rail pad production.