Treads, inner liners and inner tubes for vehicle tyres, and compositions therefor

摘要

A composition for a tread, inner liner or inner tube for a vehicle tyre includes a natural or synthetic rubber binder and a filler, the filler including alumino silicate microspheres formed from pulverised fly ash. The microspheres are inexpensive, are produced from ash which would otherwise be discarded to landfill and unexpectedly provide good wet grip, low rolling resistance and/or high impermeability to air in the end product.