StacksVerified U.S. regulatory reference

46 CFR §153.558

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
A phosphoric acid containment system must be:
  1. (a)Lined with natural rubber or neoprene;
  2. (b)Lined with a material approved for phosphoric acid tanks by the Commandant (CG-ENG); or
  3. (c)Made of a stainless steel that resists corrosion by phosphoric acid.