Borax deca is white powder crystal. Item Specification Premium grade First grade Na2B4O7.10H2O 99.5%MIN. 95.0%MIN. Carbonate (CO2) 0.10%MAX. 0.2%MAX. Insoluble matter in water 0.04%MAX.0.04%MAX. Sulfate (SO42-)0.10%MAX.0.2%MAX. Sodium chloride(Cl) 0.03%MAX. 0.05%MAX. Iron (Fe) 0.002%MAX. 0.005%MAX. Packed in woven plastic bags lined with plastic bags of 25KG/50KG net each.