The performance of Rail Pad is closely related to its material. Common materials can be divided into four categories: rubber, polyurethane, EVA and composite materials. Each material plays a unique role in different railway scenarios.
Rubber: Natural rubber or synthetic rubber (such as EPDM) is the most traditional Rail Pad material. Its advantages are low cost, good elasticity, and can effectively absorb the vibration generated by train operation. It is widely used in conventional railways and urban rail transit. However, rubber pads have poor aging resistance and are prone to hardening and cracking under high temperature and ultraviolet light conditions. The service life is generally 8-10 years.
Polyurethane: As a high-performance material, HDPE pads have both high elasticity and high strength, and their wear resistance is more than 30% higher than that of rubber pads. It can withstand the harsh test of heavy-duty railways and high-speed railways with high frequency and heavy loads, and has excellent weather resistance. It can work stably in extreme environments of -40℃ to +80℃, with a service life of up to 15-20 years, and is suitable for lines with extremely high durability requirements.
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: Pads made of ethylene-vinyl acetate copolymer (EVA) stand out for their good elasticity, flexibility and excellent insulation. Its insulation resistance is usually ≥1×10¹⁰Ω, which can effectively prevent current leakage while reducing shock. It is often used in special areas such as urban rail transit, bridges and tunnels with high requirements for shock absorption and insulation, and can maintain stable performance even under extreme temperatures.
| 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) |
Composite materials: Pads made of a variety of materials such as rubber, plastic, and fiber, which combine the advantages of each material. For example, the rubber layer provides elastic buffering, and the fiber-reinforced layer improves the load-bearing capacity. It is suitable for complex environments such as bridges and tunnels. It can meet multiple requirements such as shock absorption, insulation and fatigue resistance at the same time, and provide reliable protection for rail systems under special working conditions.
In railway engineering, selecting the appropriate Rail Pad material according to the line type, operation requirements and environmental conditions is the key to ensuring the safe and efficient operation of the rail system.