Brent settled at $105.55/bbl, down 0.12%, while WTI rose 0.10% to $101.50, narrowing the transatlantic spread to $4.06. Natural and butadiene rubber moved in opposite directions, widening their daily spread to 2.6 percentage points.

Synthetic rubber weakened across the board: butadiene rubber (BR) -3.84% and natural rubber (NR) -0.98%, with the gap between them widening. BR is squeezed by falling butadiene feedstock and tire-plant run cuts; NR only dipped on slower port-inventory draw. The widening spread flags a split in downstream restocking cadence.

The European Commission issued CBAM Transitional Rule Update No.4 on Sep 12, 2026, adding natural rubber and butadiene rubber products to the preliminary reporting list for the first time. Exporters must submit embedded carbon data for bulk rubber goods shipped to the EU starting Oct 2026.

Natural rubber front-month fell 0.89% to CNY 19,425/t—second consecutive day of decline; SBR dipped 0.22% to CNY 15,660/t. Tire makers may delay raw material procurement amid rising caution.

Butadiene rubber front-month contract rose 1.68% to ¥15,755/ton, hitting a three-week high; stable butadiene costs and tire makers’ restocking are narrowing near-term procurement windows.

Butadiene rubber futures closed at ¥15,590/ton, up 4.91% on the day—the largest single-day gain in three weeks; combined with a weaker USD/CNY, marginal relief in import cost pressure slightly narrows short-term pricing leverage for downstream synthetic rubber buyers in East China.

Butadiene rubber front-month contract closed at ¥15,590/ton, up 4.91%—its largest one-day gain in three weeks; short-term procurement costs rose notably, warranting attention to tire plant operating rates.

Fuel Oil front month contract dropped to 3862 CNY/t, down 0.05%. Bitumen rose 0.50%, while Natural Rubber climbed 0.53%.

NR futures at ¥18,750/t (+0.48%), BR at ¥14,930/t (−0.27%); spread widens to ¥3,820/t, signaling weaker cost support for synthetics — marginally influencing tire makers’ raw material blending decisions.