MIL-DTL-53072E
mixing ratios. Reduction of the admixed material shall be according to the manufacturers'
instructions. Component B shall always be added to component A and this procedure shall never
be reversed. The preferred temperature range of each component shall be 60 to 90 oF (16 to 32 ºC)
before mixing.
3.4.1.4 Reduction. Reduce the admixed primer if necessary with MIL-T-81772 type II, HAP-
free thinner (see 3.7.1) or thinner recommended by the manufacturer, but do not exceed the VOC
limit of 340 g/l (2.8 lbs/gal). The reduced primer shall be continuously stirred to allow thorough
mixing and to counter pigment settling. Strain through a 60 mesh minimum paint filter or
equivalent. Let stand at room temperature for 30 minutes to allow primer adequate time to
induct or follow the manufacturers' instructions.
3.4.1.5 Application. All surfaces to be painted shall be thoroughly cleaned as specified in 3.2 and
pretreated as specified in 3.3. To ensure a chemically clean surface, perform the test in 4.2.3.1.1.
Failure to comply with 4.2.3.1.1 is sufficient cause to do additional cleaning. The primer shall be
applied to the specified film thickness and needs to dry up to 6 hours (dry to touch) before applying
the topcoat. Times vary depending upon environmental conditions and the manufacturers'
recommendations. The admixed primer shall be used within 4 hours after mixing to ensure
performance. The dry film thickness (DFT) shall be between 0.6 and 0.9 mils (15 and 22.5
microns) for aluminum and between 0.8 and 1.2 mils (20 and 30 microns) for aluminum-steel
assemblies. The largest factor affecting cure is temperature. At 70 oF (21 oC), the dry to touch
time is 30 minutes and the surface is dry to handle within 6 hours when checked according to
ASTM D1640.
3.4.1.6 Comments. The primer furnished under this specification shall be products that are
authorized by the qualifying activity for listing in the QPD (see 6.4).
3.4.2 MIL-DTL-53022 (Primer, Epoxy Coating, Corrosion Inhibiting, Lead and Chromate Free).
3.4.2.1 Description. This specification covers an air drying, corrosion inhibiting epoxy primer
for ferrous and nonferrous metals. It is formulated lead and chromate free. The type II coating
has a maximum VOC content of 420 g/l (3.5 lbs/gal). Type III and IV coatings are hazardous air
pollutants-free (HAP-free) and have a maximum VOC content of 340 g/l (2.8 lb/gal). Type IV is
also an enhanced corrosion performance technology. The enhanced corrosion performance
includes 1,000 hours salt spray and 40 cycles on the cyclic corrosion test. A type V coating is
furnished in self-contained portable kits. The kits contain the type IV corrosion inhibiting epoxy
primer in a touch-up system. The specification is a two package system consisting of a
pigmented epoxy resin (component A) and a polyamine-epoxy catalyst (component B).
3.4.2.2 Use. This primer is intended for use on properly cleaned and pretreated ferrous and
nonferrous surfaces. It is an acceptable primer system to use with CARC topcoats.
3.4.2.3 Preparation. The component A shall be thoroughly mixed and stirred prior to admixing.
Mix one part of component B to four parts of component A by volume and stir until well
blended. Allow the admixed material to sit according to the manufacturer's recommended
induction time. The preferred temperature range of each component shall be 60 to 90 oF (16 to
32 ºC) before mixing.
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