The chloride-control standards: C795 qualifies thermal insulation for use over austenitic stainless steel (external stress-corrosion-cracking prevention), with C871 as the leachate chemistry test behind it. The mechanism it guards against — chloride concentration on hot stainless under wet insulation — is one of the nastier CUI variants. Quality mineral wools certify to it; always demand it on 304/316 service.
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