Magnesium oxysulfate cleanroom panels deliver A1 non-combustible cores and strong moisture resistance, but jobsite failures still appear when procurement and installation ignore the material's physical rules. Moisture regain causing face bubbling, core cracking from impact or improper handling, powdering of low-density boards, alkali efflorescence at seams and fire-code rejections from substituted cores are the five faults that stall cleanroom handover. This FAQ gives purification contractors, hospital and pharma total packages, food-plant buyers, fire-protection subcontractors and site QA engineers a fast diagnostic checklist for magnesium oxysulfate cleanroom panels, with repair priorities aligned to medical, lab, food and GMP enclosures. SAMZOON, a Foshan original manufacturer, anchors each item with acceptance-aligned fixes drawn from South China purification project cases.