316ss Corrosion Common Chemicals

sodium hydroxide, caustic soda, hydrochloric acid, sulfuric acid, hydrofluoric acid, hydrogen peroxide, hypochlorous acid, potassium hypochlorite, aluminum chloride, ammonium fluoride, aniline hydrochloride, aqua regia, bromine, calcium nitrate, chloric acid, chloro sulfonic acid, chromic acid, fluorine gas, hydrobromic acid, mercuric chloride, methyl cellosolve, potassium bichromate, sodium fluoride, stannic chloride, trichloroacetic acid

Flowline's published chemical compatibility table (data/reference/flowline-chemical-compatibility.csv, 285 chemicals x up to 2 concentration/temperature points each) rates 316 stainless steel as Corroded (C) for 29 named chemicals at the tested concentration/temperature, including several this project quotes routinely: sodium hydroxide, hydrochloric acid, sulfuric acid, hydrofluoric acid, hydrogen peroxide, hypochlorous acid, and potassium hypochlorite. This directly contradicts the 316SS-as-safe-default assumption baked into many other vendor product lines already in this catalog (e.g. AVCO Valve, Griffco). For nearly every one of these 29 chemicals, the same row rates at least one plastic (usually PVDF or PTFE, sometimes PVC/PP) as Excellent or Good - the fix is switching wetted material, not avoiding the chemical. Always check the specific concentration/temperature row in the reference CSV before defaulting to 316SS wetted parts for any of these chemicals; ratings are concentration- and temperature-dependent, not a single yes/no per chemical (consistent with the pattern already established in Griffco's sulfuric acid bulletin).

any PVDF, PTFE, or PFA wetted construction (check data/reference/flowline-chemical-compatibility.csv for the specific chemical/concentration/temperature) (Valve)