S 1867 (OTTO) Sodium dichromate, GR 99%+ Cas 7789-12-0 - used as a catalyst in the synthesis of Endoperoxide II. Strong oxidizing agent in organic synthesis. S 1867 (OTTO) Sodium dichromate, GR 99%+ Cas 7789-12-0 - used in metal finishing as an aid in corrosion resistance.