The magnesium oxysulfate cleanroom panel is moving from a regional substitute for traditional magnesite boards into a compliance-grade enclosure material for food processing, pharmaceutical GMP, coastal manufacturing, and high-humidity electronics support zones. Three forces are converging: global procurement teams are closing the chloride loophole in MgO-based specifications, A1 non-combustible and low-smoke envelope rules are being enforced as full-assembly tests rather than core-only claims, and wet-process facilities in tropical and export-food markets are rejecting any panel chemistry that can release halide bloom under washdown. This module converts those signals into a sourcing blueprint for cleanroom GCs, F&B EPCs, pharma project engineers, and overseas purchasing managers. SAMZOON, a Foshan source manufacturer, anchors the analysis with chloride-titration logs, four-side sealed profiles, and South China food/coastal cleanroom QC.