Stainless steel rock wool sandwich panels are specified for chemical plants, high-humidity workshops, food GMP walls and anti-corrosive cleanroom partitions because the 304/316L face and A1 rock wool core should survive acid mist, washdown, salt spray and fire-compartment audits. In the field, the same panel still fails when the stainless grade is mis-declared, the rock wool density is under-specified, the four-side edge seal is skipped, the adhesive line breaks under humidity, or the fire cert does not match the delivered lot. This module converts the five highest-frequency site failures — stainless face pitting, seam water ingress, rock wool core sag and moisture wicking, skin-to-core delamination, and failed fire-rating acceptance — into a QA-grade troubleshooting map for procurement engineers, purification GCs, laboratory EPCs and corrosion-project buyers.