Rail Pad is a functional component specially designed to meet the low-noise requirements of urban rail transit. By incorporating porous elastic structures, rubber-foam composite materials, or surface damping coating technology, it can reduce wheel-rail contact noise by 8–15 dB while minimizing vibration transmission to the surrounding environment. This meets the environmental noise reduction requirements for lines near urban core areas and residential zones, making it a key track component that balances functionality and environmental friendliness.
How is the replacement cycle for rail pads determined?
Rail pad replacement cycles are determined by a mix of scheduled inspections, performance monitoring (stiffness, vibration), and material degradation analysis, balancing expected lifespan (8-25 years for rubber) with operational factors like traffic, environment, and specific criteria like < 20% permanent compression or significant stiffness change, ensuring safety and performance.
Key Factors & Methods
Visual Inspection: Regular checks for cracks, discoloration, or foreign objects; replacement needed if cracks > 5mm or severe aging is seen.
Material Hardness & Elasticity: Testing Shore hardness (e.g., ±15 degrees from initial) or recovery rate (<80% after load) indicates material failure.
Stiffness Changes: Monitoring static/dynamic stiffness; a major shift (e.g., 50% change in static spring constant) or exceeding specified limits (e.g., 15% dynamic stiffness rate change) triggers replacement.
Fatigue & Load Cycles: Using lab tests (like 3 million cycles) to predict field performance, often correlating with stiffness changes.
Vibration & Noise: Measuring vibration reduction; if performance drops below standards (e.g., <20dB for urban lines), pads are replaced.
Environmental Factors: UV, temperature extremes, and chemicals accelerate aging, influencing maintenance schedules.
What are the materials used in railway pads?
Railway pads use elastic materials like Natural Rubber (NR), Styrene-Butadiene Rubber (SBR), Polyurethane (PU), and High-Density Polyethylene (HDPE), often combined with fillers like carbon black, to absorb shock, reduce noise, and protect sleepers from wear, with modern options also including recycled polymers for sustainability.
| Raw Material | Rubber, EVA, TPEE, HDPE |
| Standard | UIC, AREMA, TB/T2626-95 |
| Application | 43kg/m, 50kg/m, 60kg/m, 75kg/m,115RE, UIC54, UIC60, S49 |
| Model number | 43-7-7, 43-10-7, 50-7-9, 50-10-9, 60-10-17, 60-12-17 |
| Operating temperature | -50~70 degrees |
| Certificate | MSDS, ROHS, REACH |
| Notes | They should be stored in a clean, ventilated place. Don't be in direct sunlight, and keep away from the heat source and chemical reagent. Don't touch the oil, organic solvent, and other chemicals. Banned exposure. |
Rail pad functions
A rail rubber pad is essential in reducing shock and vibration in a rail system. The pad laid under the rail to ensure:
- Load distribution over a larger surface
- Elimination of load concentration and the resultant fatigue stresses
- Centering of loads on the supporting element
- Absorption of uneven contact surfaces between rail and support
- Reduction of noise and vibration
- Sealing between the bottom of the rail and the top of the support
- Reduction of wear of the rail and its support
GNEE RAIL provides exceptional elastic rail pads of various types for high-speed railways, normal-speed railways, and cranes. Especially the rail pads made of rubber, EVA, TPEE, and HDPE are very popular with customers. Our railway rubber pads fit the rails such as UIC54, UIC60, BS80lbs, BS100lbs, etc. We have more than 130set of machines in our production lines which can reach an annual production capacity of up to 2000, 000 pieces of rail pads. We offer a wide range of rail pads and other track materials at competitive prices.
