Section 160.053-3 - Materials, construction and workmanship(a)General. Except as otherwise specifically provided by this subpart and subparts 164.019 and 164.023 of this chapter, the materials, construction, and workmanship of unicellular plastic foam work vests specified by this subpart shall conform to the requirements of Military Specification MIL-L-17653A.(b)Color of envelope. Indian Orange, Cable No. 70072, Standard Color Card of America, will be acceptable in lieu of the Scarlet-Munsell 7.5 red 6/10 color specified for envelopes or covers by paragraph 3.1.1.1 of Specification MIL-L-17653A.(c)Color of webbing and thread. The color of the webbing and thread need not match the color of the envelope as specified by paragraphs 3.1.3 and 3.2.8 of Specification MIL-L-17653A.(d)Materials; acceptance and quality. All components used in the construction of work vests must meet the applicable requirements of subpart 164.019 of this chapter.CGFR 59-22, 24 FR 4961, June 18, 1959, as amended by CGD 84-068, 58 FR 29493, May 20, 1993