# PTT and Siam Cement to combine polyolefin plastics units in joint venture

Thailand's PTT Group and Siam Cement Group announced a joint venture to manufacture commodity-grade plastics, creating one of Southeast Asia's largest producers in the sector.

- Type: Partnership
- Announced: 2026-10-30
- Where: Thailand
- Status: announced
- Products: commodity-grade plastics, polyolefin plastics
- Sectors: [Plastics and Polymers](https://endata.com/sectors/plastics-polymers.md)

## Companies

- [Siam Cement](https://endata.com/companies/6339.md) (partner)
- [PTT](https://endata.com/companies/8850.md) (partner)

## Sources

- [asia.nikkei.com](https://asia.nikkei.com/business/materials/thailand-s-ptt-and-siam-cement-to-combine-polyolefin-plastics-units), 2026-10-29: "Thailand's PTT Group and Siam Cement Group will establish a joint venture to manufacture commodity-grade plastics, the companies announced on Thursday."

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Data from Endata (https://endata.com/). Announcements are summarized from public sources and may be incomplete; check the linked originals.