Food Grade Caustic Soda 50% (AFCO 0533) is food grade 50% caustic soda (sodium hydroxide) which meets the Food Chemicals Codex (FCC) test requirements for food grade 50% caustic soda. It can be used for food preparation in which food grade caustic soda is required. AFCO 0533 can also be used for cleaning equipment in milk and food processing plants, for neutralizing acids in process waters and waste waters, and as an alkalinity booster in boilers and in cooling water systems.