Polyurethane is used for castors and rollers because of exceptional abrasion resistance, load bearing capacity, high impact resistance, strong bonding with metals as well as plastic materials, non effect of weathering conditions.
Polyurethane is new wonder material, which has superior properties, and plays a vital role in todays industrial scenario, which combines strength of plastic and elasticity of rubber. Wire springs have tendency to break under high pressure and also have permanent set in short time.