Rail pads can be categorized into rigid and elastic materials based on performance, each suited for different track applications. Their key characteristics are as follows:
Rigid Materials
Designed for stable support and load transfer, ideal for sections with low cushioning requirements:
High-Density Polyethylene (HDPE): Offers excellent corrosion resistance and structural stability. Its high rigidity prevents deformation, ensuring precise sleeper elevation control. Commonly used in straight sections or low-impact zones of urban rail transit to adjust track geometry.
Precast Concrete Blocks: Made of high-strength concrete (compressive strength ≥ C50), these provide superior load-bearing capacity. Widely used in heavy-haul railways, such as marshaling yards and freight lines, to distribute stress rigidly and reduce sleeper settlement risks.
Elastic Materials
Absorb impacts through deformation, making them the preferred choice for high-speed and passenger rail lines:
Natural Rubber: With over 80% elastic recovery, it effectively cushions wheel-rail impacts and provides excellent insulation. Ideal for passenger-dedicated lines and intercity railways where ride comfort is critical. However, its weak aging resistance requires UV-protective coatings.
Polyurethane: Adjustable hardness (Shore A 60–90) and outstanding fatigue resistance. After 1 million load cycles, elasticity loss remains below 10%. Its operational temperature range (-30°C to 80°C) suits high-speed rail applications.
EPDM Rubber: With added antioxidants and UV absorbers, it achieves weather resistance grade C or higher. Performs reliably in coastal or high-humidity metro systems, with a service life exceeding 15 years.
Composite Elastic Materials: Examples include rubber-aramid fiber composites. The reinforcement layer increases tear strength to over 20 kN/m, making them suitable for stress-concentrated areas like turnouts and curves, balancing cushioning and stability.
Material Selection Criteria
The choice depends on track type (ballasted/slab), axle load, and environmental conditions to ensure system safety and durability.
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.