(a) Suitability. All materials used in the construction of fire-protective equipment shall be of the quality best suited for the purpose intended.
(b) Materials covered by reference specifications. Where specifications are referred to for a given material, it is intended to require that the quality of material used shall be at least equal to that covered in the reference specifications. [21 FR 9032, Nov. 21, 1956, as amended by CGD 94-108, 61 FR 28292, June 4, 1996]