Stannous chloride 
 Formula: SnCl2 · 2H2O 
 Properties: colorless columnar crystals, density 3.95g/cm3. Soluble in water, alcohol and acetic acid, in concentrated hydrochloric acid to increase solubility. When dissolved in the above 37.7 ℃. 
 Purposes: as chemical reagents, organotin chemicals, plastics plating sensitizer, stabilizer spices, food additives, textile auxiliaries and so on.