Specifications include, but are not limited to: Materials applied to aircraft movement surfaces must consist of washed granular
mineral sand particles, dried, free of stone, clay, debris, slag, chloride salts, and
other corrosive substances. The pH of the water solution containing the material
must be approximately neutral (pH 7). Material must meet the following gradation
using a U.S.A. Standard Sieve conforming to ASTM E 11-81.