Molecular formula:Na2Cr2O7H2O
Molecular weight:298.00
Properties: Orange red crystal which will dehydrate to generate copper brown anhydride at 84.6 centigrade degree. It dissolves in water, but not in alcohol. Characterized by a strong moisture absorption and a good hygroscopy, it is a powerful oxidant. While coming into contact with an organic substance, it will burn, therefore, it should be sealed for storage. This product is toxic.
Intended uses: It finds widespread applications and is mainly used for manufacturing chromic anhydride and other chromic salt products. It is also used for soaking metals, removing corrosion and electrolytic corrosion, mordanting wool fabrics, preventing timber corrosion, bleaching fat, tanning, etc. Besides, it also serve as an oxidant for synthetic perfume, medicine, dye, etc.
Specifications and quality:
Index Name | Grade A | Grade B | Grade C |
Sodium bichromate(based on Na2Cr2O7H2O) | 99.3%Min | 98.3%Min | 98.0% min |
Sulfate(based on SO4) | 0.20%Max | 0.30%Max | 0.40%Max |
Chloride(based on Cl) | 0.10%Max | 0.10%Max | 0.20%Max |