MIL-R-85523A(AS)
3.4.1 Standard parts. MS and AN standard parts shall be used where they suit the purpose. When MS or AN standard parts are used, they shall be oxygen clean.
3.4.2 Metal parts. All metal parts shall be of a corrosion resistant material or treated in a manner to render them adequately resistant to corrosion.
3.4.2.1 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be used in intimate contact with each other. Dissimilar metals are defined in MIL-STD-889.
3.4.2.2 Finish. Aluminum and aluminum alloy parts shall be protected in accordance with MIL-A-8625 or MIL-C-5541.
3.4.3 Elastomer parts. Any elastomer part that is adversely affected by continued use with oxygen shall not be used.
3.4.3.1 Age. Elastomer parts except silicone shall be not more than 12 months old from the date of manufacture to the date of delivery to any Government service or to any airframe or accessory manufacturer.
3.4.3.2 Ozone resistance. The elastomer parts shall be composed of ozone resistant materials, which shall not bloom, and shall meet the specified ozone resistance performance requirements.
3.4.3.3 Storage life. Elastomeric materials selected shall have an expected shelf storage life of 8 years or more based on the guidelines of MIL-HDBK-695
when such materials will provide the required physical, mechanical, and chemical properties.
3.4.4 Organic parts. All organic parts, regardless of state or modification, used in the regulator construction shall not support fungoid growth, as defined in MIL-STD-810, Method 508.
3.4.5 Protective treatment. When materials used in the construction of the regulator are subject to deterioration when exposed to environmental conditions likely to occur during service usage, they shall be protected against such deterioration in a manner that shall in no way prevent compliance with the performance requirements of this specification. Protective coating which might crack, chip or scale during normal service life or under extremes of environmental conditions shall not be used.
3.4.6 Adhesives. The regulator shall not contain glue, varnish or other such coatings or adhesives to secure parts (except labels) or to seal leaks.
3.4.7 Cleanliness.
3.4.7.1 Degreasing. Prior to assembling the regulator and its subassemblies, all internal surfaces shall be degreased in accordance with MIL- STD-1359.
3.4.7.2 Lubricants. Lubricants qualified to MIL-G-27617 may be used sparingly on seals and straight threads if assembly difficulty is encountered.
3.4.8 Toxic materials. Materials that produce toxic or corrosive substances shall not be used in the construction of the regulator.
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