Shengyishe published its September 21 national sulfur benchmark at 7,669.00 yuan per metric tonne, unchanged on the day at 0.00 percent in the open commodity table.
Month to date the index is down 8.14 percent versus the September 1 opening level of 8,349 yuan per tonne, keeping the correction from early-month highs in focus for phosphate and smelter buyers.
The flat session follows September 20, when the same 7,669 yuan print held unchanged while Longzhong cut Zhenjiang port granular to 7,200 yuan, down 500 yuan week on week.
SMM's August customs release on September 20 put China sulfur imports at 272,323 metric tonnes, down 65.03 percent year on year, a fundamental backdrop that still argues against a quick domestic spot rebound.
Fertilizer Daily's September 20 phosphate review cut Zhenjiang granular sulphur to 7,150 yuan and East China liquid sulphur to 7,325 yuan, both down on the day, showing fertilizer-chain weakness beneath a flat national benchmark.
BC Insight's September 19 Price Trends kept North American FOB sulphur steady at 1,100 to 1,200 dollars per tonne while describing bearish buyer sentiment against stubbornly high spot levels globally.
Middle East supply relief remains partial: BC Insight counted roughly 380,000 tonnes on eight vessels still inside the Gulf backlog after a ceasefire window cleared 22 vessels carrying about 1.07 million tonnes.
SunSirs and SMM tables this month still place import offers above many domestic benchmarks, preserving parity floors even as port prices fall faster than seaborne offer levels.
For Alberta recovered sulfur on the Vancouver stem, sub-7,700 yuan domestic granular does not by itself collapse Pacific netbacks when BC Insight holds a 1,100 to 1,200 dollar FOB band.
The Vancouver Fraser Port Authority reported 3,507,428 metric tonnes of sulfur exports in 2025, up 5 percent year on year, with China still the largest listed destination at 1.30 million tonnes.
AER ST3 data run 27 August 2026 put Alberta province-wide closing inventory at 11,109,610.9 tonnes for July 2026, a verified_public anchor that replaces stale trade-press July 2025 prints on public charts.
Shengyishe's September 21 trend screen labeled a strong rebound on improved short spreads even as the twenty-day spread widened, a technical read that can coexist with a flat spot line.
Desk read: September 21 Shengyishe is a pause print inside an 8.14 percent month-to-date draw. Watch plant quotes and FDD sulphur lines near 7,150 to 7,325 yuan before treating 7,669 yuan as a floor.