Platts launches CFR SEA Butene-1 weekly price assessment

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

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

Platts assesses 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 reflects 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 is published in Olefinscan , in Platts database and on Platts Connect under the following symbols and description.

The new assessment was first proposed in a subscriber note published on July 24 , 2025 and available here. The communication to launch the assessment was published on Aug. 29, 2025 and the subscriber note can be found here.

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