This document discusses different grades of bentonite powder including drilling grade, API 13A Section 4 grade, API 13A Section 6 (OCMA) grade, OCMA DFCP-4 grade, foundry grade, and cattle feed grade. It provides specifications and test results for properties such as yield, filter loss, moisture content, screen analysis for each grade. Drilling grade bentonite is used in oil and water well drilling as a sealant and lubricant. Foundry grade has high gelling time and strength for use in foundries. Cattle feed grade is used to supplement feed for cattle.