Who we are

Founded in 1975, PT. Yosomulyo Jajag started off from a humble beginning and has grown to become the leading producer and exporter of Calcined Petroleum Coke in Indonesia today.


Our company's main operation is in the production of Calcined Petroleum Coke (CPC), a nearly pure carbon source used primarily for industrial applications. The major distinct characteristics of our CPC is its low impurities content.


Our company is officially certified to the ISO 9001:2008 Quality Management Systems and ISO 14001 Environmental Management System through an extensive review by SGS.


PT. Yosomulyo Jajag plans to continue expansion of its Calcined Petroleum Coke production capacity and to maintain its position as the dominant CPC producer and exporter in Indonesia.

Company at a glance
- Established in 1975
- Headquarter: Surabaya, Indonesia
- Product: Calcined Petroleum Coke
- Accreditation: ISO 9001:2008
- Accreditation: ISO 14001