Any of a number of purity standards for chemicals and chemical products established by various specifications. Some of these grades are as follows:ACS (American Chemical Society specifications) reagent (analytical reagent quality)CP (chemically pure)USP (conforms to U.S. Pharmacopeia specifications)NF (conforms to National Formulary specifications)FCC (Food Chemicals Codex specifications)Other common grade designations are chemical, commercial, feed, food, injectable, nitration, purified, radio, research, semiconductor, spectro, technical (industrial chemicals).