From Rubber & Plastics NewsBoulder City, Nevada-Amerityre Corp. said it has begun development of a polyurethane tyre compound and manufacturing process for retreading medium commercial truck tyres with a polyurethane elastomer tread compound.The company said the retreading process-which it claims has been successfully developed and tested in passenger car tyre applications-"is a natural fit for the medium commercial truck tyre used by tens of thousands of over-the-road truck fleets worldwide."Richard Steinke, Amerityre president and ceo, said "the benefits of polyurethane elastomer as a tyre compound are evident. In both endurance and high-speed testing our polyurethane compounds have run substantially cooler than rubber. In addition, these compounds have outperformed comparable rubber compounds in both accelerated heat aging and ozone testing."All tests have been conducted by an independent laboratory in accordance with applicable FMVSS or ASTM test standards, according to Boulder City-based Amerityre. Its retreading process involves applying the polyurethane tread compound to the rubber tyre casing so that the tread locks "seamlessly" to the tyre casing without pressure or vulcanisation.The retread development is expected to be completed by the end of the year and the company has allocated another three months for industry testing and feedback before looking to market the manufacturing technology directly to the retreading industry, it said."