Platts to launch CFR SEA Butene-1 price assessment Sept. 26, 2025

Platts, part of S&P Global Commodity Insights, will launch a new weekly butene-1 assessment for Southeast Asia, effective Sept. 26, 2025.

The assessment will complement Platts existing coverage of ethylene and polyethylene markets in Asia and build on the existing coverage of linear alpha-olefins in the US.

Platts will assess the CFR Southeast Asia butene-1 as a cash differential to the Platts C+F Japan naphtha assessment (Mean of Platts Japan, or MOPJ). Cash differential, also known as premium or discount, represents the price counterparties trade against the benchmark values published.

The new assessment will reflect the following parameters and terms:

Market information for products with other specifications and non-standard terms may be considered for the assessment and may be subject to normalization to the standard specifications and terms.

The new assessment will be published in Olefinscan, in Platts database and on Platts Connect.

The new assessment was first proposed in a subscriber note published on July 24, 2025, and available here.

Please send all feedback, comments and questions to petchems@spglobal.com and pricegroup@spglobal. com .

For written comments, please provide a clear indication if they are not intended for publication by Platts for public viewing. Platts will consider all comments received and will make comments not marked as confidential available upon request.