Clay Processing US EPA
SCC 305042 for ball clay processing, SCC 305043 for fire clay processing, SCC 305044 for bentonite processing, SCC 305045 for fullers earth processing, and SCC 305046 for common clay and shale processing. Clays are categorized into six groups by the U. S. Bureau Of Mines. The categories are kaolin, ball clay, fire clay, bentonite