... azo dyes,fabric dye ,fabric dye mordant and bleaching agent ,metal heat treating agent ,cement pre-strong agent ,antifreezer etc, ... CrystalSpecification: ItemQuality IndexHigh-Class First-Class Qualified-Class Purity99.0% min 98.5% min 98.0% min Moisture :1.4% max 2.0% max 2 ... as mordant and bleacher for fabric dyeing, as well as metal heat treatment agent, early-strength admixture and antifreeze of ...