ASTM F 870 - 94 (Reapproved 2016) Standard Practice for Tread Footprints of Passenger Car Tires Groove Area Fraction and Dimensional Measurements

Current edition approved Jan. 1, 2016. Published February 2016. Originally approved in 1984. Last previous edition approved in 2010 as F870 – 94 (2010). — 5 p.
This practice covers a technique for measuring the groove or void area of a tire tread pattern. The void area is measured on the inked impression of a tire tread statically loaded against heavyweight paper on a load platen.
This procedure is intended to serve as a reference practice for measuring groove or tread pattern void areas in a tire-footprint impression. This technique is usable by any laboratory without special equipment although more sophisticated procedures are also commonly employed, such as optical or video camera processes.