Rail Pads: Essential Components of Track Systems
Rail pads are critical elastic components installed between the rail and sleeper (or track slab), serving as a key interface connecting the rail to the substructure.
Appearance & Design
Typically rectangular in shape, rail pads range in thickness from a few millimeters to over a dozen millimeters, with exact dimensions determined by track design standards. Their surfaces often feature anti-slip patterns or raised textures to enhance friction with the rail base and sleeper (or track slab), preventing displacement under dynamic loads.
Material Composition
Primarily made of elastic polymers such as rubber or polyurethane, some variants incorporate rubber-metal composites. These materials provide excellent elasticity and deformation recovery, enabling effective load distribution and vibration absorption.
HDPE
| 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) |
Rubber
| 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 |
Core Functions: Cushioning & Adjustment
Under train loads, rail pads absorb wheel-rail impact energy through elastic deformation, reducing damage to rails and sleepers (or track slabs). They evenly distribute forces to prevent localized stress concentrations while allowing vertical stiffness adjustments to ensure smooth and safe operation.
Universal Application
Rail pads are indispensable across ballasted and slab tracks, as well as conventional, high-speed, and urban rail systems. Their performance directly impacts track longevity and ride quality.
GNEE RAIL is a professional trading company focusing on the export of railway fasteners, committed to providing reliable rail connection products for global railway construction projects. The main products include a full range of railway fasteners such as various spring clip fastener systems, sleeper bolts, anti-loosening washers and insulating components, which are suitable for various application scenarios such as conventional railways, heavy-duty railways and urban rail transit.