Under Ballast Mats (UBMs) cover a large area under the entire ballast layer for comprehensive vibration/noise isolation and ballast protection, ideal for bridges or sensitive areas, while Under Sleeper Pads (USPs) are placed directly under individual sleepers (ties) to distribute load, reduce ballast wear, extend tamping intervals, and manage settlement, often acting as an economical alternative to UBMs in some applications. UBMs are for systemic isolation, whereas USPs are for localized sleeper-ballast interface optimization, though both enhance track stability and reduce maintenance.
Under Ballast Mat (UBM)
- Placement: Under the entire ballast layer, resting on the subgrade or sub-ballast.
- Primary Function: To provide comprehensive isolation from ground-borne noise and vibration, protecting the substructure and reducing structural damage.
- Benefits: Isolates the entire track system, protects ballast from destruction, maintains substructure integrity, and is great for bridges and tunnels.
- Material: Typically rubber or polyurethane elastomers, often in large rolls for coverage.
| Technical specifications of under ballast mat | |
| Parameter | Specification |
| Material | Resin bonded rubber |
| Setup | Possible to install in single, double or double plus a bottom stabilisation layer |
| Thickness Range | Single layer of elastomer: 10 to 30 mm |
| Non-woven protection layer: 1.8 mm | |
| Total system thickness: 11.8 to 51.8 mm | |
| Geometry | Flat or wavy |
| Density Range | 710 to 1000 kg/m³ |
| Supply Form | Rolls |
| Joints | Not required |
Under Sleeper Pad (USP)
- Placement: Directly beneath each sleeper (tie).
- Primary Function: To increase the sleeper-ballast contact area, distribute loads more evenly, and reduce ballast attrition (crushing).
- Benefits: Extends tamping intervals, reduces maintenance, helps manage differential settlement (especially at transitions), and can be a cost-effective vibration solution.
- Material: Elastic materials like rubber, cork, or composites, often integrated during sleeper production or applied later.
| Technical informations of under sleeper pad | |
| Parameter | Specification |
| Material | Devulcanized rubber and Polypropylene |
| Colour | Black |
| Thickness | As needed for the customer specification |
| Dimensions | As per concrete sleeper size |
| Quantity per sleeper | 2 pieces |
| Density | 1168 kg/m³ |
| Cstat | 0.15 to 0.32 N/mm³ |
| Environmental impact | 95 % recycled - 100 % recyclable |
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.
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