Polyurethanes exhibit outstanding mechanical and physical properties in comparison with other elastomers.
Over a temperature range of -53 to +93C, resistance to petroleum oils, hydrocarbon fuels, oxygen, ozone and weathering is good. However, polyurethanes quickly deteriorate when exposed to acids, ketones and chlorinated hydrocarbons.
Used in solid tyres, rollers, belting, bushes.
Advantages: The most abrasion resistant of all elastomers; good resistance to ozone and radiation.
Limitations: Susceptible to hydrolysis in hot and damp conditions.