MIL-DTL-24631A(SH)
4.3.1 Definition of a lot. For the purposes of conformance inspection
and test sampling, a lot is defined as all the paint of the same type, formula
and color from a single uniform batch, produced and offered for delivery at
one time. The addition of any substance to a batch shall constitute a new
lot.
4.3.2 Sampling for conformance testing. As a minimum, the contractor
shall select two samples of sufficient size to permit the performance of all
the inspections and tests as specified in table II (see 6.8).
4.4
General test requirements.
4.4.1 Test conditions. Unless otherwise specified, all testing
conditions shall be in accordance with Section 9 of FED-STD-141. The term
referee condition shall mean a temperature of 23 + 1 C (73 + 2 F) and a
relative humidity of 50 + 4%.
Unless otherwise specified, test panels shall
4.4.2
Metal test panels.
be:
(a)
150 x 300 x 3 millimeter (mm) (6 x 12 x 0.125 inch [in])
(nominal) plate mild steel.
(b)
Steel test plates shall be abrasive blasted with aluminum
oxide and solvent cleaned to provide a uniform, clean rough
surface with a profile of 0.050 to 0.076 mm (0.002 to 0.003
in) (nominal) on both sides. Care shall be taken to coat
edges and to cover the blast profile.
(c)
Paint test film shall be spray or brush applied to the primed
steel panel and the dry film thickness of the test film
shall be 7.6 to 12.7 micrometers (um) (0.003 to 0.005 inches
[in]).
(d)
Paint test specimens shall be cured not less than 7 days at
ambient laboratory conditions before testing.
4.4.3 Neoprene rubber test panels. Unless otherwise specified,
neoprene test panel shall conform to ASTM D-2000-75e, Type BC.
(a)
Neoprene rubber in accordance with 4.4.3 shall be lightly
sanded with no. 240 sandpaper and shall be wiped with
mineral spirits to remove manufacturing and sanding residue
and any oils that may be present.
(b)
Paint test film shall be spray applied and the wet film
thickness shall be 13 to 21 um (0.006 to 0.008 inches).
(c)
Paint test specimens shall be cured not less than 7 days
at ambient laboratory conditions before testing.
4.4.4 Preparation of mixed coating. The paint shall be prepared for
mixed paint tests by thoroughly mixing components A and B in accordance with
the ratio specified in the applicable specification sheet. The thoroughly
mixed paint shall be allowed to condition at ambient laboratory conditions for
1/2 hour prior to testing.
4.5
Examinations and tests.
4.5.1 Composition. Manufacturer records (material orders, receipts for
material delivery, batch tickets showing material used, etc.) shall be
reviewed. Reviewed results shall be in accordance with the requirements of
3.3.
4.5.2 Standard quantitative tests. The paint shall be tested for the
quantitative requirements of table II as specified in 3.4.1 as follows (see
table II):
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