Introduction to the relevant technical parameters of Rubber Rail Pads
Rubber rail pads, as critical components of track systems, have technical parameters that directly determine the mechanical performance and environmental adaptability of the rail infrastructure.
| 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 |
The core parameter of dynamic stiffness (70-150 kN/mm) is achieved through precise control of polymer molecular crosslink density. This parameter dynamically matches track vibration frequencies-when stiffness is 90 kN/mm, it effectively attenuates structure-borne noise in the 16-25 Hz frequency range. Hardness parameters (70-80 Shore A) combined with compression set (≤15%) form a dual guarantee for the elastic system, ensuring the pads maintain 3-5% elastic recovery space even under 60-ton axle loads.
Electrical insulation performance requires stable volume resistivity within 10^6-10^8 Ω·m, achieved by adding special dielectric fillers, capable of withstanding long-term exposure to 25kV catenary voltage. Among physical characteristics, the synergistic effect of tensile strength (≥12.5 MPa) and elongation at break (≥250%) allows the pads to accommodate longitudinal displacement from rail thermal expansion/contraction. Environmental adaptability parameters include: >85% impact strength retention after -40°C brittle temperature tests, >80% tensile strength retention after 336 hours of thermal oxidative aging at 150°C, and no micro-crack formation after 1000 hours of continuous exposure to 50 pphm ozone concentration.
Durability parameters are verified through accelerated fatigue testing, requiring dynamic stiffness variation within ±10% of initial value after 3 million cycles of 100 kN pulsating loads. Specially designed groove structures achieve over 90% pressure distribution uniformity on the bearing surface, effectively preventing stress concentration in concrete sleepers.
As a professional rail fastener manufacturer, GNEE RAIL can produce various types of rubber rail pads with different materials, such as natural rubber, EVA, HDPE and so on. Our EVA/HDPE/rubber rail pads are with high elasticity, applying to types for rails such as rail UIC54, UIC60, BS80lbs,BS100lbs, and sizes as ordered. The pads can be customized with or without grooves, in various possible designs, depending on customers' requirements.
