MIL-PRF-23377K
3.8.1 Water resistance. The topcoated primer coatings shall withstand immersion in
distilled water maintained at 49 ±3° C (120 ±5° F) for 4 days without exhibiting any evidence of
wrinkling, blistering, or any other coating deficiency (see 4.5.7).
3.8.2 Corrosion resistance.
3.8.2.1 Salt spray. The primer coatings, with and without a topcoat, shall not exhibit
blistering, lifting of either coating, nor substrate pitting after exposure to a 5 percent salt spray
for 2,000 hours. There shall be no white corrosion or pitting in the scribe (see 4.5.8.1).
3.8.2.2 Filiform. The topcoated primer coatings shall not exhibit filiform corrosion
extending beyond 6.35 millimeters (mm) (0.25 inch) from the scribe, and the majority of the
filaments shall be less than 3.175 mm (0.125 inch) in length (see 4.5.8.2).
3.8.3 Solvent resistance (cure). The primer coatings shall withstand 50 passes (25 back and
forth rubs) by a cloth rag soaked in methyl ethyl ketone (MEK). Rubbing through to bare
substrate constitutes failure of the primer coatings to properly cure (see 4.5.9).
3.8.4 Fluid resistance. The primer coatings shall withstand immersion for 24 hours in
synthetic lubricating oil conforming to MIL-PRF-23699, and synthetic hydraulic fluid
conforming to MIL-PRF-83282. Four hours after removal from the respective fluid, the coatings
shall not exhibit any softening, blistering, loss of adhesion, nor any other coating deficiency.
Discoloration of the coatings is acceptable and shall not be cause for rejection (see 4.5.10).
3.9 Working properties.
3.9.1 Mixing and dilution. The components of the primer coatings, including thinner if
required (see 6.11), shall homogeneously blend when mixed by a paint shaker in the volume
mixing ratio specified by the manufacturer. Within one hour of mixing, the admixed coatings
shall not separate into visually distinct layers (see 4.5.11.1).
3.9.2 Application. The admixed primer coatings shall be capable of being applied by
conventional, airless, high volume/low pressure (HVLP) or electrostatic spray equipment.
Application shall yield a uniform film with no runs or sags at a dry-film thickness of
15 to 23 microns (µ m) (0.6 to 0.9 mil) (see 4.5.11.2).
3.10 Identification of material. Individual containers greater than one pint and cases of
containers less than one pint shall be identified with the following information:
MIL-PRF-23377K, "Primer Coatings: Epoxy, High-Solids" type I or II, class C1, C2,
or N
Component identification (as applicable):
Component A - base component or Component B - curing agent or Component C -
thinning component
Manufacturer's name and product number
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