46 CFR 160.010-5: -5 Buoyant apparatus with plastic foam buoyancy.

(a) Buoyant apparatus with plastic foam buoyancy must have a plastic foam body with an external protective covering. The body may be reinforced as necessary to meet the tests in § 160.010-7.

(b) Plastic foam used in the construction of buoyant apparatus must be a unicellular type accepted by the Commandant (CG-ENG-4) as meeting one of the following:

(1) Subpart 164.015 of this chapter.

(2) MIL-P-19644C (incorporated by reference, see § 160.010-1 of this subpart).

(3) MIL-P-21929B (incorporated by reference, see § 160.010-1 of this subpart).

(4) MIL-P-40619A (incorporated by reference, see § 160.010-1 of this subpart).

(c) The external protective covering must be—

(1) Fibrous-glass-reinforced plastic, constructed of a polyester resin listed on the current Qualified Products List for MIL-P-21607E(SH) (incorporated by reference, see § 160.010-1 of this subpart), or accepted by the Commandant (CG-ENG-4) as meeting MIL-P-21607;

(2) Elastomeric vinyl accepted by the Commandant (CG-ENG-4) as meeting § 160.055-3(j) of this chapter; or

(3) Any other material accepted by the Commandant (CG-ENG-4) as providing equivalent protection for the body of the apparatus.