Butadiene rubber front-month contract closed at CNY 14,910/t, down 3.84%—its steepest one-day drop in three months. Natural rubber fell 0.98% to CNY 19,150/t amid weak tire demand and cautious procurement.

Butadiene Rubber (BR) and Styrene-Butadiene Rubber (SBR) are driven by butadiene cost and the NR price ratio; the synthetic/natural blend in tyre recipes swings with the spread. SNSUC lists NR and SR together for price comparison.