The clearest split on the board today sits between the heavy-end chain and the rubber chain. Fuel oil rose 3.36%, bitumen 1.54%, while natural rubber slipped 0.15% and butadiene rubber gained 1.66% — heavy ends moved up as a block, rubber stayed pinned near the floor. Inside SNSUC's 13 commodity categories these two groups run on different drivers: heavy ends track crude and refinery turnaround distillate gaps, rubber tracks tire operating rates and butadiene feedstock supply.

For procurement this means one FX assumption and one inventory model cannot cover every category. We back out the fuel oil and bitumen crack-even from delivered crude cost, and watch Qingdao bonded stocks plus Shandong truck-tire run rates separately for rubber. Natural rubber's 0.15% dip is essentially flat — a sideways pause after last week's futures backwardation repair, not a trend reversal.

Our data terminal shows the 13 categories as two curves: a crude-to-heavy crack line and a rubber-to-synthetic line. A trader sees at a glance which side to fix today. The quoted-price formula anchors heavy ends to Brent and rubber to the SHFE front contract plus premiums, kept strictly separate.