MIL-PRF-25134C(USAF)
is reached, the panels shall be rinsed in a stream of tap water. Gentle brushing with a soft bristle
brush is acceptable to break the lifted film. The areas tested with comparison formula and those
tested with test remover shall be compared for completeness of paint removal in compliance with
requirements of 3.8. If the remover demonstrates worse performance than the comparison
formula, measured by area of paint not removed, the material shall be rejected.
4.7.6 Rinsability. Rinsability shall be determined immediately after the removal test of 4.7.5 using
the same test panels. After lifting of the coating and rinsing is complete on the areas tested as
specified in 4.7.5, the areas tested with comparison formula and those tested with remover shall
be compared for ease and completeness of flushing off lifted wrinkled finish and for freedom from
residue. Brushing with a soft bristle brush is acceptable to break residue film. If rinsing
characteristics or remaining residue is observably worse with the remover than with the
comparison formula, the material shall be rejected.
4.7.7 Coating residue. One panel of each paint system (see Table 1) shall be prepared and taped
as specified in 4.6. The procedure specified in 4.7.5 for application of the remover and
comparison formula shall then be repeated and the panels permitted to stand for 15 minutes. At
the end of the 15 minute period, the panels shall be lowered to a horizontal position. After the
remover and comparison formula have been in contact with the panel finish for 2 hours, a gentle
stream of tap water shall be flowed over the test areas while they are gently scrubbed with a soft
bristle brush. The panels shall then be rinsed with distilled water and air dried. If the remover
stripped areas indicate coating residue or remover residue exceeding that left by the comparison
formula, the material shall be rejected.
4.7.8 Remover residue. Samples of the remover and comparison formula shall be flowed onto
separate 3 by 6 inch 2024-T3 aluminum alloy panels conforming to ASTM B209. After the
remover and comparison formula have been applied, the panels shall be placed at a 45° angle from
the horizontal in an oven maintained at 100° 3°F for 15 minutes. At the end of the 15 minute
period the panels shall be removed from the oven, rinsed with a fine stream of tap water (50° to
70°F) then rinsed with distilled water and allowed to air dry. If the remover leaves more residue
than the comparison formula, the material shall be rejected.
4.7.9 Corrosion.
4.7.9.1 Preparation of test panels. Sixteen test panels 1 inch by 2 inches and of any convenient
thickness shall be prepared from the following metals:
Two each
-
Steel, SAE AMS 5046
Two each
-
Tinplate, ASTM A623 and ASTM A624, Type MR, Temper T4,
Class Electrolytic 25, bright finish
Two each
-
Magnesium alloy, SAE AMS 4377 (AZ31B-H24),
treated in accordance with MIL-M-3171, Type I
Two each
-
Magnesium alloy, SAE AMS 4377 (AZ31B-H24),
treated in accordance with MIL-M-3171, Type III
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