Sodium dichromate dihydrate

Sodium dichromate dihydrate (CAS 7789-12-0) is a hexavalent chromium salt supplied as an orange-red crystalline solid. It functions as a powerful oxidizing agent and corrosion inhibitor across a range of heavy industrial processes. In leather tanning, it serves as the primary precursor for chrome tanning liquors, enabling the production of durable, supple hides at commercial scale. Metal finishing and surface treatment operations use it to apply chromate conversion coatings.

These coatings protect steel, aluminum, and zinc substrates from corrosion. In mining and hydrometallurgy, it acts as a flotation depressant and reagent in the selective separation of sulfide ores during processing. Textile dyeing facilities use it as a mordant to fix chrome-complex dyes onto wool and other natural fibers, improving wash fastness. This ensures high-quality color retention in industrial textile manufacturing.

Sodium dichromate dihydrate is supplied as orange crystalline granules or flakes, with the dihydrate form being the standard commercial product. Technical grade is the predominant specification available in bulk. The material typically assays at 99%+ purity to meet rigorous industrial requirements. It is commonly traded in 25 kg bags, drums, and bulk quantities suited to large-scale industrial procurement volumes.