MIL-DTL-53030D
centrifuge with a second tube containing one ml of the H2SO4 solution. The solution in the
second tube shall act as the test "blank". Immerse a chromate ion (CrO42-) test strip into the
supernatant from each tube. Shake off the excess liquid and after approximately one minute
compare the color change in the reaction zone of the strips to the color scale (concentration
levels) provided by the manufacturer. The appearance of a purple/violet color from the "sample"
strip is indicative of hexavalent chrome and therefore shall constitute failure of the test
requirement. If a color change is apparent from the "blank" strip rerun the test using fresh,
chromium-free reagents. The appearance of a pronounced color change is indicative of
hexavalent chrome and therefore shall constitute failure of the test requirement.
4.5.4.3 Lead content. Determine the presence or absence of lead by weighing 50 mg of pigment
into a small glass test tube. Add 5 ml of dilute HNO3 and shake vigorously for 1 - 2 minutes.
Decant a one ml aliquot into a plastic micro-centrifuge tube and centrifuge for five (5) minutes at
17,000 rpm, balancing the centrifuge with a tube containing one ml of the dilute HNO3 solution.
This tube shall also act as the test "blank". Immerse a lead test strip into the supernatant from
each tube. Shake off the excess liquid and after approximately one minute compare the color
change in the reaction zone of the strips to the color scale (concentration levels) provided by the
manufacturer. If any color change is apparent from the "blank" strip rerun the test using fresh,
lead-free reagents. For the "Sample" strip, the appearance of a bright red color is indicative of
lead at a concentration level above the specification limit, while no color change or a faint pink
color change is indicative of lead concentrations below the specification limit. Confirmation of
the exact lead concentration in the coating's solids shall be determined using any authoritative
quantitative method, such as ASTM D3335.
4.5.5 Analysis of component B.
4.5.5.1 Nonvolatile (total solids) content. Determine the percent nonvolatile (total solids) of
component B as specified in 4.5.4.1, except that toluene shall be used to disperse the material.
Nonconformance to table III shall constitute failure of this test.
4.5.6 Analysis of admixed primer.
4.5.6.1 Drying time. Spray the mixed coating on a test panel (see 4.5.2 and 4.5.2.1) to a dry film
thickness of 1.5 ± 0.2 mils (37.5 ± 5.0 microns) and determine the drying under ambient
conditions in accordance with ASTM D5895. Check for compliance with table IV.
4.5.6.2 Specular gloss (60 degrees). Prepare a film of the primer on steel as specified in 4.5.2.1
and allow to dry 48 hours. Determine the 60 degree specular gloss in accordance with ASTM
D523. Nonconformance to table IV shall constitute failure of this test.
4.5.6.3 VOC. Separately mix components A and B, and then combine them as specified in
4.5.11.1, but do not thin the mixture. Keep the container tightly covered.
4.5.6.3.1 Nonvolatile (total solids) content. Determine the weight percent total solids, Xm, of the
admixed primer in accordance with the procedure specified in 4.5.4.1.
4.5.6.3.2 Density. Determine the density, Dm, of the admixed primer in g/l in accordance with
ASTM D1475.
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