Formic acid (chemical formula HCOOH, molecular formula CH2O2, molecular weight 46.03), common name formic acid. Colorless liquid with pungent odor. Weak electrolyte, melting point 8.6℃, boiling point 100.8℃. It is very acidic and corrosive, which can stimulate skin blistering. is widely used in pesticide, leather, dye, medicine and rubber industries. Formic acid is directly used in fabric processing, leather tanning, textile printing and dyeing, and green fodder storage. It can also be used as a metal surface treatment machine, rubber additives and industrial solvents.