In August 2025, the isobutylene market in China was under pressure from weak demand and oversupply. The downstream synthetic rubber market provided some positive sentiment, but the downstream fuel additive market showed signs of weakening market sentiment due to lowered crude oil prices and limited demand. Further possible uncertainty in trade, especially with tariff negotiations ongoing between the U.S. and China, has added to the weak sentiment, with suppliers decreasing their prices in reaction to a slowdown in sales activity.
