153.558—Special requirements for phosphoric acid.
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-522); or
(c)
Made of a stainless steel that resists corrosion by phosphoric acid.
Code of Federal Regulations
Note:
“Phosphoric acid”, as defined in § 153.2
, includes phosphoric acid, superphosphoric acid, and aqueous solutions of phosphoric acid.
[CGD 73-96, 42 FR 49027, Sept. 26, 1977, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; CGD 88-100, 54 FR 40042, Sept. 29, 1989]