Oriental Carbon and Chemicals Limited (OCCL), a company belonging to the Duncan JP Goenka group of companies, traces its origin to 1978 when it was incorporated as Dharuhera Chemicals Limited (DCL). In 1994 OCCL set up a unit for manufacturing of Insoluble sulfur which later emerged as the star product of the group. Insoluble sulfur manufactured in its plant is marketed as "Diamond Sulf" in India and around the world. The plant, through continuous innovations over the years, can be counted among the best in the world. It adheres to total Quality norms and is ISO9001-2000 & EMS14001-2004 Certified. Quality consciousness and an understanding of the customers needs for constant product and process improvement have contributed to the growth of OCCL's Insoluble sulfur business. An ongoing mutually rewarding relationship with its global clients, complemented by a growing demand for Diamond Sulf, has encouraged OCCL to continuously enhance its production levels. Today, continuous improvement is the guiding corporate philosophy.

Regular Insoluble Sulfur
* DS - OT - 10
* DS - OT - 20
* DS - OT - 33

High Stable Insoluble Sulfur
* DS - OT - 10 (HS)
* DS - OT - 20 (HS)
* DS - OT - 33 (HS)

Special Grade Insoluble Sulfur
* DS 90
* DS OT 25 AS
* DS OT 20(HD)