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Item Standard Result Purity, % 99.95 99.98 Water, Wt%. PPm% 50 35 Alkalinity, NaOH, % 0.03 0.01 Density P20/g/cm3 1.615-1.625 1.624 ColourHazen, 15 10 Non-volatilematter, % 0.005 0.002.