ItemsStandardsResultsAppearanceYellow to off-whitecrystallinepowderCompliesIdentificationBy IRCompliesBy HPLCCompliesSolubilityPractically insoluble in waterCompliesWater Content≤0.50%0.35%HeavyMetals≤20ppmCompliesResidue on IgnitionIndustrial Humidifier & DRoadway Safety ehumidifier ≤0.10%0.06%RPower Supply & Distribution elativeSubstanceAny single impurityResonator : ≤0.20%0.12%Total Impurities: ≤1.00%0.26%Assay (on the anhydrous basis)99.0%~101.0%99.82%Reference StandardIn-house StandardConclusionThe productcompliedtoIn-housestandard.StoragePreserve in tight,light-resistant containers in a cool place