Natural rubber front-month settled at ¥20,980 per tonne, up 3.76% on the day and back above the ¥20,800 line that had capped it for the past week inside a ¥20,200–¥20,600 band. One clear up-bar broke the range.

Butadiene rubber did not keep the same pace, gaining only 2.6% to ¥16,795. The NR-BR spread widened from ¥3,575 last week to ¥4,185, reopening the blending window for tire makers — except this time it is natural rubber doing the pushing, not cheap substitution.

The real pain sits in fixed-price coverage. Most annual contracts lock a portion at month-average or fixed levels and leave the rest to be priced on the screen. Today's jump widened mark-to-market losses for plants that left coverage short, and several that planned to price late in the month pulled the timing forward.

The physical market moved faster. Inquiries for bonded natural rubber receipts at Qingdao rose through the session; traders used bonded digital warehouse receipts as collateral to secure stock without full upfront payment while keeping title in hand. A stronger yuan (USD/CNY 6.6929) lowered the local-currency landed cost of dollar-priced imports, which made the lock stock first, price later combination more workable.