U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
A phosphoric acid containment system must be:
(a) Lined with natural rubber or neoprene;
(b) Lined with a material approved for phosphoric acid tanks by the Commandant (CG-ENG); or
(c) Made of a stainless steel that resists corrosion by phosphoric acid.
“Phosphoric acid”, as defined in § 153.2, includes phosphoric acid, superphosphoric acid, and aqueous solutions of phosphoric acid.
