MIL-STD-186F (MI)
4.20 Wire covering. Vinyl wire insulation, shielding, and sleeving shall not be used. Tetrafluoroethylene, chloro-sulfonated polyethylene, and other materials compatible with their environment shall be used.
4.21 Lubrication. Dry-film lubricants containing graphite shall not be used. For an acceptable dry-film lubricant, see codes 708 and 709. (Oils and greases used in conjunction with dry-film lubricants negate the effect of dry-film lubricant.)
4.22 Identification marking. Epoxy-type printing inks shall be used for identification purposes, code 806. Aniline base inks contain corrosive acids and shall not be used. (See code 805 for an alternate printing ink and marking method.)
4.23 Drainage. Attention shall be directed toward the elimination of crevices, pockets, hollows, walls, etc., that permit water to collect. Provisions such as drain holes shall be provided to allow suitable drainage of the design. Where possible, finishing of parts shall be done prior to fabrication. Where this is not possible, the finishing and fabrication of items shall be handled in such a way that processing solutions shall not become trapped within any of the assemblies such as lock seams, lap joints, spot welds, rivets, bolts, or other places where processing solutions will remain on the parts.
4.24 Standard parts/Government standard parts (bolts, nuts, screws, washers, etc). Standard parts (MS, AN, NAS, DS, etc.) that are procured with protective finish already applied as specified by the procurement document relating to the manufacture of the part, shall be inspected prior to assembly to determine if the part conforms to the finish requirement of the procurement document. In the event that the part does not meet the finish requirement of the procurement
document, it shall be refinished and reinspected. Lots of Government standard parts shall be subjected to sampling in accordance with a plan acceptable to the contracting activity, and samples shall be subjected to the salt spray test of ASTM B
117.
4.25 Application to previously painted surfaces. When touching up damaged areas or applying a chemical agent resistant coating (CARC) topcoat to an existing CARC topcoat, the procedure to be followed shall be based on the provisions of MIL- C-53072 and depends upon the type and condition of the existing finish. (In using
the provisions of MIL-C-53072, the user must obey all EPA, OSHA, and other regulations and restrictions regarding the use of solvents.) Items previously coated with alkyds, lacquers or vinyl must be stripped down to the epoxy primer if present, or to the substrate if not. For rework, polyurethane and epoxy topcoats can only be applied over for previously painted epoxy or polyurethane topcoats.
4.25.1 Surface preparation. Scratches or other light damage to polyurethane or epoxy topcoats will require scuff sanding at the immediate blemish area. Damage or corrosion extending to the substrate will require sanding and repriming. All traces
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