Mainly used in the production of formic acid, oxalic acid and insurance powder. 2. Used as a reagent for the determination of phosphorus and arsenic, a disinfectant and a mordant. 3. Preservatives. Diuretic effect. 4. It is an intermediate for the production of formic acid and oxalic acid, and is also used for the production of dimethylformamide. Also used in medicine, printing and dyeing industry. It is also a precipitant for heavy metals. 5. Used in alkyd resin coatings, plasticizers, strong explosives, acid-resistant materials, aviation lubricants, adhesive additives. 6. The leather industry, the camouflage acid in the chrome leather method. 7. For catalysts and stable synthetic agents. 8. Reducing agents in the printing and dyeing industry.