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)

precedence.  Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3.  DEFINITIONS

apply.

3.1  Definitions.  For the purposes of this standard, the following definitions

3.2  Exterior surfaces.  The outward or exposed surfaces of the weapon and ground support equipment after all doors, hatches, and access ports are closed will be considered as exterior surfaces.

3.3  Hermetically sealed.  A hermetically sealed system is one that is purged and filled with a dry, inert gas medium, or one where humidity is properly controlled to less than 10 percent relative humidity before sealing.  Hermetic sealing is also defined as sealed to the extent that there is no moisture-laden air or water introduced into the sealed unit or component where subjected to a combination of the following:

(a)  Moisture resistance testing for 15 days, moisture to be maintained at

95 percent relative humidity and temperature to be cycled at a constant rate between

-53.9° and 68.3° Celsius (C) during each 24 hour period.

(b)  Leak testing either at a vacuum of 5 pounds force per square inch (lbf/in2) or at an external pressure of 20 lbf/in2  for not less than 2 hours.  Units of measurement for leaks will be atmospheric cubic centimeters per second (Atm cc/sec), allowable limit for leaks will be 10-8  Atm cc/sec to 10-5  Atm cc/sec.

3.4  Supplier.  The supplier is that contractor who has accepted an order from the Government or who has entered into a contract with the Government for the purpose of furnishing parts, components, and assemblies complying with the requirements of this standard.

3.5  Nonreparable.  "Nonreparable" is defined as a characteristic of assemblies or components that can only be repaired at the maintenance echelon where purging, evacuation, or pressurization described in 3.3 can be accomplished.

3.6  Similar and dissimilar metals.  For the convenience of the user this standard provides tables IX and X as classification of similar bare metals which must be given prime consideration for design purposes and will, insofar as possible, be used where different metals and plating are in close proximity.

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