... -hydroxybenzoic white crystal powder, assay:99-100.5%, M.P.:158-161 degree c, Loss on drying:0.5% max, Sulphate: 200ppm ... RESULT1. APPEARANCEWHITE CRYSTAL POWDERCOMPLIED2. ASSAY99.0-100.599.413. M.P.C158-161158.74.CHLORIDE100PPM MAXless than 1005. SULPHATE200PPM MAXless than ...