MIL-DTL-26666G
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), samples shall be subjected to first article inspection in
accordance with 4.5.
3.2 Materials. Materials shall be as identified herein or as approved by the acquiring activity.
However, when a specific material is not specified, a material shall be used which will enable the hose
assemblies to meet the performance requirements of this specification. Acceptance or approval of any
constituent material shall not be construed as a guarantee of acceptance of the finished product.
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.2.2 Hazardous substances. The use of hazardous substances, toxic chemicals, or ozone
depleting chemicals shall be avoided, whenever feasible.
3.2.3 Other materials. Materials not otherwise specified shall be in accordance with applicable
specifications and to the requirements specified herein. All materials that are not specifically described
shall be of the highest quality and suitable for the purpose intended.
3.2.4 Fungus proof materials. Materials which are not nutrients for fungi shall be used to the
greatest extent practicable without effecting performance. Where materials that are nutrients for fungi
must be used, such materials shall be treated with a fungicidal agent to render the material fungus-
resistant.
3.2.5 Rubber products. Rubber products, such as, seals, covers, and friction layers shall be
fabricated from rubber components in accordance with ASTM D2000.
3.2.6 Dissimilar metal. Unless protected against electrolytic corrosion, dissimilar metals shall not be
used in intimate contact with each other. Dissimilar metals are defined in MIL-STD-889.
3.3 Design and construction. The hose assembly shall be designed for a pneumatic working
pressure of 4,000 psig (275.79 bar) in an operating temperature range of -65°F to +160°F (-53.89°C to
71.11°C).
3.3.1 Hose construction. The hose assembly shall consist of a hose with a seamless inner tube,
reinforced with corrosion resistant steel wire coupled with corrosion resistant steel end fittings, and a
protective outer cover. The hose shall be capable of retaining end fittings without slippage or leakage.
3.3.1.1 Inner tube. The inner tube shall consist of a high density polyethylene compound of
seamless construction and uniform gage. It shall be compounded and processed to permit the least
amount of effusion of compressed gases consistent with the requirements specified herein. The
uncompounded polyethylene material shall conform to ASTM D1248, type 3. The inner tube shall have a
smooth bore, be free from pitting and other defects, and free of any foreign material or lubricants.
3.3.1.2 Reinforcement. The reinforcement shall consist of two or more spirally wrapped or braided
(or combination there-of) plies of high tensile steel wires. Reinforcement separation materials, if used,
shall permit gas effusion from the inner tube to escape to the atmosphere. There shall be no broken or
spliced reinforcing wires nor shall any wires be omitted in any length of hose.
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