Melting Point of insolated 226--230Appearance:White crystalsContent %: ≥ 98.5Identity: Complies with BP/USPLoss on drying % ≤3Benzoate and salicylate:No precipitate or violet color appearsHeavy metals ppm ≤10Free acid or alkali:Complies with BP/USP/DABReadily carbonizable substances:Not more intensely colored than referenceP-toluene sulfonamide:≤10ppmO-toluene sulfonamide:≤10ppmSelenium ppm:≤30ppmRelated substance:Complies with DABSulfated Ashes:Complies with BP/USPOrganic volatiles:Complies with BPZinc ppm:≤30ppm