The temperature dependence of abrasion of various gum and black-filled rubbers on silicon carbide paper is closely similar to the temperature dependence of their energy density at break determined at a high rate of extension. The conclusion is drawn that this type of abrasion is predominantly due to tensile failure, as had been envisaged in earlier work. The effective rate of extension during abrasion at a sliding velocity of 1 cm/sec is about 10,000 per cent/sec. The volume of abraded rubber is approximately proportional to the ratio between frictional energy dissipation and energy density at break. The proportionality constant is greater for black-filled than for gum rubbers. The effects of temperature and velocity on the abrasion of non-crystallizing gums are interrelated by means of the Ferry transform, indicating the viscoelastic nature of the abrasion process operating on these compounds.