Apperance: colorless transparent or slightly light color thick liquid, pure phosphoric acid for colorless crystals, odorless, with a sour taste.

Nature: transparent colorless viscous solution, odorless. General content of 85% ~ 95%. Continue to concentrate to obtain colorless columnar crystals, density (18 deg C) 1.834g/cm3, melting point 42.3 deg C, boiling point 158 deg C, freezing point 21.1 deg C. It was heated to 150℃. And changed to pyrophosphoric acid and to metaphosphoric acid at about 215℃., with a vapor pressure of 300. Strong deliquescence. Miscible with water and ethanol.

Use: phosphoric acid is mainly used in the field of water treatment as a water softener, a scale cleaning agent, and a raw material for producing a phosphorus-based water treatment agent. There are many other uses of phosphoric acid, high purity phosphoric acid can be used in the production of fluoride-free feed; Used as a polishing agent in the electroplating industry; Used as a detergent in the printing industry. Ethylene synthesis and purification of hydrogen peroxide during the cycle as an acidulant; Beverage production as an acidulant and flavoring agent; Dye industry as a desiccant. Textile printing and dyeing industry as a printing and dyeing mordant, silk gloss agent; Daily chemical industry as a detergent additive, for the production of safety matches; Sugar industry as a clarifier; Analytical chemistry as Analytical reagents.

Safety: a concentrated solution of phosphoric acid is irritating to the skin and eyes and can corrode the skin to cause inflammation. Phosphoric acid vapor can cause nasal mucosa atrophy, can cause systemic poisoning. The maximum allowable concentration of phosphoric acid in air is 1 mg/ma. If not, the skin contact with phosphoric acid, should immediately rinse with plenty of water, and wipe red mercury solution or gentian violet solution, poisoning phenomenon should be sent to the hospital immediately. It is not allowed to be stored and mixed with alkaline, toxic and corrosive substances.