46 C.F.R. § 164.009-3 Noncombustible materials not requiring specific approval.
Title 46 - Shipping
The following noncombustible materials may be used in merchant vessel construction though not specifically approved under this subpart: (a) Sheet glass, block glass, clay, ceramics, and uncoated fibers. (b) All metals, except magnesium and magnesium alloys. (c) Portland cement, gypsum, and magnesite concretes having aggregates of only sand, gravel, expanded vermiculite, expanded or vesicular slags, diatomaceous silica, perlite, or pumice. (d) Woven, knitted or needle punched glass fabric containing no additives other than lubricants not exceeding 2.5 percent. [CGD 86–035, 54 FR 36316, Sept. 1, 1989]
Title 46: Shipping
PART 164—MATERIALS
Subpart 164.009—Noncombustible Materials for Merchant Vessels
§ 164.009-3 Noncombustible materials not requiring specific approval.

