MIL-STD-186 Protective Finishing For Army Missile Weapon SystemsThis standard establishes the minimum requirements for procedures, materials, and systems for cleaning, plating, painting and finishing metals, wood, electronic materials, parts and assemblies for rockets, guided missiles, and components to protect them from deterioration.

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MIL-STD-186F (MI)

4.   Printed circuit assemblies without conformal coatings.

5.   Moisture tight designs without proper seals.

6.   Unprotected bearings.

7.   Untested adhesively bonded designs. (stress and humidity tests)

8.   Metallic construction if nonmetallic is acceptable.

9.   Hardware requiring field maintenance for corrosion control.

10. Inadequate consideration for acid fumes in battery locations.

11. Star washers, except as specified in 4.15.

12. Upset metal staking as a method of retention, except on power train and running gear.

13. Phenolic resins in enclosed assemblies without post-baking treatment.

14. Unsealed joints, except ground or lapped joints affecting accuracy of alignment.

15. Cut, unpainted, or unplated edges on metallic materials.

16. Snap rings or lock washers, except in main power train or running gear.

(b)  Materials Prohibitions:

1.   Aluminum alloys 2024-T3 or T4.  (Use T8 or 5000/6000 series). Use of 2000 or 7000 series aluminum alloys with proper tempers in accordance with SAE AMS-H-2770, SAE AMS-H-2771 and SAE AMS-H-2772 are acceptable.  MIL-HDBK-1587 may be used as guidance.

2.   Aluminum alloys 7001-T6, 7278-T6 and 7075-T6.  (Use T73 temper or 7050-T73).

3.   Magnesium alloy, except as specified in 4.12.

4.   Precipitation hardening stainless steels in the H900, H950, or

H1000 tempers.  (Use H1025 or higher temper).

5.   Lubricants and greases that contain graphite.

6.   PVC plastics and electrical insulation.

7.   Corrosive type RTV adhesives/sealants (Emit acetic acid during cure).

8.   Rubber that is susceptible to ozone damage.

9.   The use of silver plated copper wire that has less than 40 microinches of silver and fails deterioration control tests per ASTM B298.

10. Chromate conversion coating on aluminum that fails 168 hours salt spray exposure per ASTM B117.

11. Cadmium or zinc plating without supplementary treatment. (see paragraph 4.16)

12. Gold plated electrical contacts without nickel undercoating.

13. Silver plated electrical contacts.

14. Potting and foam materials that are reversion prone.

15. Bare corrodible metal surfaces.

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