Industrial grade phosphoric acid is an important inorganic acid, mainly used in electroplating industry, pharmaceutical industry, phosphate industry and metallurgical industry. Its pure product is colorless transparent viscous liquid or orthorhombic crystal, odorless, taste very acid. The content of phosphoric acid in the market is mostly 85%, which is colorless, transparent or slightly light-colored and thick liquid. It is mainly used to prepare electrolytic polishing liquid and chemical polishing liquid for polishing aluminum products. The pharmaceutical industry is used in the manufacture of oil sodium phosphate, iron phosphate, etc., and also in the manufacture of zinc phosphate as a dental filling adhesive. Used as a catalyst for the condensation of phenolic resin, a desiccant for the production of fuels and intermediates. The printing industry is used to prepare a cleaning solution for wiping off stains on offset printing plates. Also used in the preparation of matchstick stains. Metallurgical industry for the production of phosphoric acid refractory mud, improve steel furnace life.

Industrial phosphoric acid has a melting point of 42.35°C and a boiling point of 213°C (loss of H2O) produces pyrophosphoric acid. Its relative density is d181.834, easily soluble in water and ethanol, its acidity is weaker than strong acids such as sulfuric acid, hydrochloric acid and nitric acid, but stronger than weak acids such as acetic acid and boric acid. Special attention should be paid to safety when using.

In general, industrial grade phosphoric acid is widely used in various fields, but safety and protective measures should be paid attention to when used.