SunSirs' open daily table for China's industrial sulfuric acid printed 1,557.50 yuan per tonne on 2026-10-15, 2026-10-16, 2026-10-17, and 2026-10-18 without change.
The flat run followed a step down from 1,677.50 yuan per tonne on 2026-10-13 and 2026-10-14, a 120 yuan, or 7.2 percent, move in the acid screen over two days.
Shengyishe's domestic sulfur benchmark held 6,652.33 yuan per tonne at the Oct 18 rawmex close, unchanged for a second session at the three-month low, aligning acid's pause with sulfur's floor.
Phosphate and industrial buyers often watch acid before committing to fresh sulfur imports, so a four-day acid plateau can signal digestion rather than immediate follow-through lower on spot sulfur.
Coastal elemental sulfur inventories near 1.123 million tonnes on Shengyishe's Oct 15 wire add supply-side weight that can keep acid from rebounding even when sulfur stops falling.
Alberta recovered sulfur still clears through the Vancouver stem when CFR netbacks cover logistics; AER August closing inventory at 11.04 million tonnes remains the North American physical reference.
ChemPortal's open freight section on 15 October still listed Vancouver loading to China on 50-60 thousand tonne parcels at 38-43 dollars per tonne, separate from licensed FOB assessment grids.
Middle East producer contract levels quoted in open trade press during October remain below summer peaks, a seaborne backdrop that can cap acid when domestic sulfur is weak.
Tampa third-quarter molten sulfur at 705 dollars per long ton remains the structured US phosphate contract anchor on Sulfur Wire's public dashboard while Q4 negotiations stay open per Green Markets' Oct 16 note.
StatCan HS 2503 tables and Port of Vancouver cargo statistics were not refreshed in this pass because the port path returned HTTP 403 and no new customs release was flagged.
Desks pairing acid and sulfur should note both screens paused into the Oct 18 weekend rather than extending the mid-week sulfur slide.
Desk read: use 1,557.50 yuan per tonne on SunSirs for China's industrial acid reference Oct 15-18; it is open commodity data, not a licensed PRA weekly assessment.