ASTM's standard D8016, Test Method for Silica, Precipitated, Hydrated — Sears Number, will be used to test quality of silica, a raw material that forms the base for "greener" tires. According to ASTM member Jorge Lacayo-Pineda, silica technology improves performance in tire-rolling resistance without deterioration in braking performance. This leads to better fuel efficiency, as well as reduction in carbon dioxide emission in cars.