MIL-M-27274E(USAF)
2.2 Non-Government publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents cited in the solicitation not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2).
AMERICAN SOCIETY FOR TESTING AND MATERIALS
ASTM-D-624 Tear Resistance of Vulcanized Rubber
ASTM-D-1788 Standard Specification for Rigid Acrylonitrile-Butadiene-
Styrene (ABS) Plastics
ASTM-D-3951 Packing, Commercial
(Application for copies should be addressed to the American Society for Testing and Materials, 1916
Race Street, Philadelphia, Pennsylvania 19103).
2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see
6.4) in accordance with 4.4.
3.2 Selection of specifications and standards. Specifications and standards for necessary commodities and services not specified herein shall be selected in accordance with MIL-STD-970.
3.3 Materials. Materials shall conform to the applicable specifications and shall be as specified herein. Materials which are not covered by specifications, or which are not specifically described herein, shall be of the best quality, of the lightest practicable weight, and suitable for the purpose intended. Materials that will come in contact with oxygen shall be entirely free from oil, grease, or any other combustible materials.
3.3.1 Silicone material. Silicone rubber shall be used in the facepiece, the delivery tube, and the microphone cable guides of the oxygen mask and shall conform to Class 3a, Grade 50 of ZZ-R-765, except that the minimum brittle point shall be -56 C and the Shore A hardness shall be 45 5. It shall be smooth and free from flash, foreign materials, or imperfections. The silicone rubber shall be post-cured in a well ventilated forced air oven. The date (by year and quarter) the silicone rubber was cured shall be molded on the facepiece and the delivery tube of the mask.
3.3.2 Plastic materials. The hardshell shall be fabricated by injection molding or forming from acrylonitrile-butadiene-styrene molding plastic conforming to ASTM-D-1788. The color of the hardshell shall be the same as the color of the mask facepiece. The thickness of the hardshell shall be 3/64 1/64.
3.3.3 Webbing. The hardshell webbing shall conform to Type I of MIL-T-8363. The color of the webbing shall be substantially the same as the color of the hardshell.
3.3.4 Nylon cord. The nylon cord shall conform to Type IA of MIL-C-5040.
3.3.5 Protective treatment. When materials that are subject to corrosion in oxygen, salt air, or any other atmospheric conditions likely to occur during service usage are used in the construction of the mask, they shall be protected against corrosion in the manner that in no way prevents compliance with the performance requirements of this specification. The use of any protective coating that will crack, chip, or scale with age or extremes of atmospheric conditions shall be avoided.
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