MIL-DTL-53030D
3.7 Qualitative requirements - dried film.
3.7.1 Flexibility. A film of primer tested as specified in 4.5.13 shall withstand bending without
cracking or flaking.
3.7.2 Adhesion. The assessment of the adhesion of the coating film shall be determined by its
ability to not peel from the substrate when tested in accordance with ASTM D3359, as specified
in 4.5.14. The resultant test rating shall be classified as scale 4B or better.
3.7.3 Water resistance. A film of primer, tested as specified in 4.5.15, shall show no wrinkling
or blistering immediately after removal of the panel from the water. The primer shall be no more
than slightly softened when examined 2 hours after removal. After 24 hours air drying, the
portion of the panel which was immersed shall be the same with regard to hardness, adhesion,
color and gloss as compared to the portion which was not immersed. Film softening shall not
exceed a 2 pencil hardness units difference (see ASTM D3363) from an unexposed film with
identical cure history prior to water exposure.
3.7.4 Hydrocarbon fluid resistance. A film of primer, tested as specified in 4.5.16, shall show no
blistering or wrinkling and no more than a slight yellowing or softening upon removal from the
fluid. After 2 hours air drying, the portion of the panel that was immersed shall be the same with
regard to hardness, adhesion, color and gloss from a panel prepared at the same time but not
immersed. Film softening shall not exceed a 2 pencil hardness units difference (see ASTM D3363)
from an unexposed film with identical cure history prior to hydrocarbon fluid exposure.
3.7.5 Corrosion resistance.
3.7.5.1 Salt spray resistance. A film of primer tested as specified in 4.5.17.1 and examined
immediately after removal from the salt spray test shall show no more than a trace of rusting
(ASTM D610, table I, rust grade 9) or corrosion, no more than five (5) scattered blisters that are
few in frequency of occurrence with a blister size number 8, and none larger than one (1) mm in
diameter for unscribed regions (see ASTM D714). Scribed areas shall have ratings as specified
in ASTM D1654 method A of not less than six (6) for steel or eight (8) for aluminum panels.
Upon removal of the primer, there shall be no more than a trace of rusting, pitting, or corrosion
on the panels (ASTM D610, table I, rust grade 9).
3.7.5.2 Cyclic corrosion test. A film of primer tested as specified in 4.5.17.2 and evaluated
using ASTM D1654 method A shall have a rating of not less than seven (7). There shall be no
more than five (5) scattered blisters in the unscribed areas.
3.7.6 Fluid resistance. A film of primer tested as specified in 4.5.18 shall show no blistering,
wrinkling or loss of adhesion immediately after removal. Slight initial softening is acceptable.
After a four (4) hour recovery period, the hardness of the primer shall be fully recovered.
Discoloration of the primer is acceptable and shall not be cause for rejection.
3.7.7 Recoating. A film of primer, tested as specified in 4.5.19, shall show no blistering,
wrinkling or other evidence of lifting.
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