... chemical raw material 1. 91-20-3 96% industrial naphthalene,technical naphthalene,Crude naphthalene,tar camphor 1)CAS:91-20-3 2)Industrial naphthalene for synthetic ... air is 10ppm,specific gravity is 1.162,melting point is 80.1,boiling point is 217.9,flashing point is78.89, and ... limit: Dust lower limit is 2.5g/m2, steam 0.9~5.9%. It belongs to the second class flammabe solid. It ...