grooved rubber pads specifications
Rail pad, is a rail rubber plate between the rail tie plate and foot of the rail, made of elastic polyurethane, which is interposed between steel rails and sleepers to reduce friction and impact. Rail pads are fastened within a fastening system by screw spikes or rail bolts into the sleeper ties.
Grooved rubber pad specifications vary by application (e.g., railway, workbench) but generally focus on material (Rubber, EVA, TPEE), hardness (Shore A or HRC), tensile strength, elongation, operating temperature range, and specific dimensions/thickness to ensure vibration dampening and durability, often with internal reinforcement like nylon or steel for added stiffness.
Key parameters include Shore Hardness (90-95A for EVA, 50-70HRC for heavy duty), Elongation (>250%), Tensile Strength (around 16 N/mm²), and temperature tolerance (-40°C to +70°C or higher).
Key Specification Categories of Grooved rubber plate
Material Composition:
- Rubber Compounds: Natural/Synthetic rubber blends, Neoprene, EPDM.
| 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 |
- Polymers: EVA (Ethylene-vinyl acetate) copolymers are common for rail pads, known for elasticity.
| 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) |
- Reinforcement: Nylon cords or thin steel sheets for enhanced stiffness, especially in rail applications.
Physical Properties:
- Shore Hardness: Ranges from 90-95 Shore A (for EVA) to 50-70 HRC (for heavier-duty rubber), affecting stiffness.
- Tensile Strength: Minimums often around 16 N/mm² (or 16 MPa) for EVA.
- Elongation at Break: Typically >250% for good elasticity.
- Compressive Stress: Max recommended around 10 N/mm² for some materials.
Performance & Durability:
Operating Temperature: Wide ranges, e.g., -25°C to +75°C (EVA) or -40°C to +230°C (heavy rubber), depending on material.
Vibration Dampening: Specific stiffness (elasticity) designed to reduce shock and noise.
Resistance: Electrical resistance (for insulation), water immersion resistance.
Dimensional & Design:
- Thickness: Varies greatly (e.g., 6mm, 10mm for rail pads).
- Grooves: Pattern and depth designed for specific rail/component contact and water drainage.
- Standards: Compliance with UIC, AREMA, or specific railway standards (e.g., IRS-T-55).
GNEE RAILWAY RAILWAY equips 130sets machines' rail pad production line, for processing, injection, refining rubber, sulfuration , moulding and inspection etc. We have our own rail pad development engineers, designing, producing and inspecting, our annual production capacity reaching up to 2000, 000 pieces.
Compared with other railway rubber pads, our product service life can be up to 3 times longer than them. The tests have proved that the pressure of more than 80 tons can be stable without deformation for our products. Using high-tech production technology, our railway rubber pads choose good rubber as main raw material, are carefully developed and made with scientific formula. They are fully in accord with railway speed and the requirements of environmental protection, so they can be used to improve the locomotive transport capacity.