Product name: Ammonium bifluoride Formula: NH4HF2 M.W.: 57.04 Description: White crystals,specific gravity 1.52,melting point 125.6°C.It can etch glass.Easily deliquescent in air,soluble in water,corrosiveness for skin SpecificationsAssay:98.0% min.Residue on ignition: 0.2% max.Heavy metals(as Pb):0.2% max.