Phosphoric Acid/ Phosphoric Acid/ H3PO4 Food Grade 85% In addition to being a chemical reagent, phosphoric acid has a wide variety of uses, including as a rust inhibitor, food additive, dental and orthopedic etchant, electrolyte, flux, dispersing agent, industrial etchant, fertilizer feedstock, and component of household cleaning products. Complete document: COA MSDS Halal Certificate Flow chart