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 Anode Grade 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. In order to responsibly operate in line with the industry best practices, we have further adopted the ISO 26000:2010 (Social Responsibility), ISO27001:2013 (Information Security Management System), ISO37001:2016 (Anti-Bribery Management System) and ISO 45001:2018 (OHS Management System) standards.


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
- ISO 9001:2008 Quality Management Systems
- ISO 14001 Environmental Management System
- ISO 26000:2010 Guidance on Social Responsibility
- ISO 27001:2013 Information Security Management System
- ISO 37001:2016 Anti-Bribery Management System
- ISO 45001:2018 OHS Management System
- Ecovadis Gold Medal for Sustainability