Oriental Carbon & Chemicals Limited engages in the manufacture and sale of insoluble sulphur worldwide. The company operates through three segments, Chemicals, Investments, and General Engineering Products. It offers insoluble sulphur under the Diamond Sulf brand. The company also provides commercial and battery grade sulphuric acid, and oleum for use in the dehydrating agent, catalyst, and active reactant in chemical processes, solvents, and absorbents; and high purity grades in storage batteries, rayon, dye, acid slurry, and pharmaceutical applications, as well as commercial grades in the steel, heavy chemical, and super-phosphate industries. In addition, it offers off-highway tire accessories, pneumatics, hydraulics, and valve automation systems. The company was incorporated in 1978 and is based in Noida, India.