MIL-DTL-24607B
4.5.1.1 Tantalum and tungsten content. The tantalum and tungsten content of the enamel shall be determined
using any appropriate spectroscopy test method. The tests shall be conducted in accordance with the instrument
manufacturer's directions for the use of the instrument. The manufacturer is responsible for supporting the test
method choice and analytical accuracy. The test results for tantalum and tungsten shall be as specified in tables II
and III.
4.5.2 Hazardous air pollutants content. Hazardous air pollutant content shall be determined in accordance with
Methods 7356 and 7360 of FED-STD-141. Solvent fractions shall be identified in accordance with ASTM E1252.
Test results shall be reported as percent by weight of the total enamel. The test results for each solvent shall be in
accordance with the requirement in 3.2.2 and table IV.
4.5.3 Color testing.
4.5.3.1 Instrumental color deviation determination. Test specimens shall be prepared in accordance with
ASTM D823 Methods C or E using a nominal 0.006-inch blade film applicator onto a clear plate glass of not less
than -inch (nominal) thickness which has been ground to a uniform finish with 1F carborundum. The color
deviation shall be determined in accordance with ASTM D2244 using an instrument having a D65 light source, a
45-degree illumination angle, and a 0-degree viewing angle. The instrument shall be demonstrated to read the color
of National Institute for Science and Technology (NIST [formerly National Bureau of Standards; SBS]) traceable
standards with the color deviations of 3.3. After calibration of the instrument, measure the L, A, B color values of at
least two FED-STD-595 color cards of the color being procured which were received from the Government not
greater than 1 year prior to the date of this use. Calculate E for each color card. Determine the mean values of E, L,
A, and B for the color cards. These mean values will be used to calculate the color difference values. The color
values of the test enamel shall be measured. The color deviation terms shall be calculated. If using an instrument
that automatically calculates the color differences, the color card mean values shall be entered as the base line for
the color difference calculations. The results of the color deviation calculation shall be in accordance with the
requirements of 3.3.1 and table V, as applicable.
4.5.3.2 Referee color matching. If the enamel measured in accordance with 4.5.3.1 does not match the color
card when visually examined, the discrepancy shall be resolved by an independent laboratory certified to the NIST
National Volunteer Laboratory Accreditation Program for paint testing. When tested in accordance with ASTM
D823, the test enamel, prepared as specified in 4.5.3.1 shall visually match the FED-STD-595 color card that most
closely corresponds to the mean values calculated in 4.5.3.1.
4.5.4 Storage stability and condition in container.
4.5.4.1 Partially-full containers. Skinning shall be determined after 48 hours in accordance with Method
3021.1 of FED-STD-141, except that a ¾-filled ½-pint, multiple friction top can shall be used. The can shall be
resealed and aged for 7 days at 140 °F (60 °C) and examined for compliance with 3.6.2.1.
4.5.4.2 Full container. A full quart can of enamel shall be allowed to stand undisturbed for 12 months and then
the contents tested in accordance with ASTM D1849. The contents shall be evaluated for pigment settling or caking
as specified in 3.6.1, then agitate the can for 5 minutes on the paint shaker prior to re-examination. The viscosity
shall be determined and other applicable tests made for compliance with 3.6.2.2.
4.5.4.3 Accelerated storage stability. After exposure to a temperature of 140 °F (60 °C) for a period of 30 days,
a previously unopened, original container of enamel shall be examined for compliance with all the requirements of
3.6.2 and the conformance tests of table VI with the exception of 3.6.12 and 3.6.13. The test results shall be in
accordance with the requirements of this specification.
4.5.4.4 Condition in container. A container of the product shall be equilibrated to test laboratory conditions
[nominal 73 °F (23 °C)]. Evidence of pressure or vacuum in the unopened container shall be noted. The container
shall then be opened and examined in accordance with Method 3011.1 of FED-STD-141 for evidence of skinning,
corrosion of container interior, odor of putrefaction, rancidity or souring, gel bodies, and hard settling. The enamel
shall be hand-stirred 300 stirs in 2 minutes with a spatula appropriate to the container, stirring so as to ensure
uniform distribution of any settled material. Immediately after stirring, the condition of the product shall be as
specified in 3.6.1.
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