Quality Standard: China National standard GB9567-97 Content(sublimation): 99.8% min. Moisture: 0.10% max. Ash: 0.03% max. PH Value: 7.5-9.5 Colour(APHA): 20 max. Haze(bolus alba)degree: 20 max. Aspect: White crystalline aspect Quality Standard: China National standard GB9567-97