... ,COA 3.Free sample 4.Basic chemical raw material 1. high quality of industrial naphthalene,technical naphthalene,Crude naphthalene,tar camphor 1 ... ) ,≥77.5ºC(qualified level)invalatile substance:≤ 0.04 (excellent grade), ≤ 0.06 (first level),≤ 0.08 (qualified level)ash:≤ 0.01(excellent grade),≤0.01 ...