MIL-DTL-15090E
4.7.6.2 Referee color matching. If the enamel measured in accordance with 4.7.6.1 does not match the color
card when visually examined, an independent laboratory certified to the NIST National Volunteer Laboratory
Accreditation Program for paint testing shall resolve the discrepancy. When prepared and tested as in 4.7.6.1, the
color shall be in accordance with the requirements of 3.6.2.
4.7.6.3 Alternative color measuring equipment. Manufacturers can propose alternative color measuring
equipment to NAVSEA or GSA by demonstrating that the particular instrumentation to be used measures the color
parameters with the accuracy needed for color deviation. The manufacturer shall demonstrate the alternate
instrumentation can provide color parameters that result in the color defined in 3.6.2 and establish correlation factors
for converting his instrument's color parameters into those of equipment meeting 4.7.6.1 by measuring an
acceptable Navy Formula No. 111 enamel previously measured on an instrument meeting the requirements of
4.7.7 Flexibility. Flexibility shall be determined in accordance with ASTM D522. The enamel shall be applied
to a flat metal plate of approximately 31 gauge coated with a dry film thickness of 0.025 mm (0.001 inch + 0.0003
inch) of TT-P-645 primer by means of a doctor blade capable of yielding a dry film thickness of 0.025 mm (0.001
inch + 0.0003 inch). The panel shall be allowed to air-dry for 2 hours then baked for 24 hours at 100 to 105 C (212
to 221 F). The panel shall then be removed from the oven and allowed to stand for 30 minutes at laboratory
temperature [nominal 23 °C (73 °F)]. The panel shall then be bent over a 3.2-mm ( -inch) mandrel or a tapered
mandrel where the minimum diameter is 3.2-mm ( -inch) and the film examined at the bent under a magnification
of five diameters. Flexibility shall be as specified in 3.6.3.
4.7.8 Condition in container. A container of the product in the size ordered shall be inspected. The product
shall be equilibrated to test laboratory conditions [nominal 23 °C (73 °F)]. 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. If the sample is in a 1-liter (1-quart) or smaller container, the character of the
lower (or settled) layer shall be determined with a spatula as specified in ASTM D869. If the sample is larger than 1
liter (1 quart), this step shall be omitted. 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 consistency of the enamel shall be measured using the Krebs-Stormer viscometer. The enamel shall be
applied to a test panel and after it has dried, the enamel film shall be examined for grains 0.8 mm (1/32-inch) in
diameter, even larger gelatinous lumps, and streaks caused by such grains or lumps. The condition of the product
shall be as specified in 3.6.5.
4.7.9 Storage stability.
4.7.9.1 Full container. Storage stability shall be tested in accordance with ASTM D1849. A container of the
product of the size ordered shall be stored at the temperature recommended in the manufacturer's data sheet or
ASTM F718 for a period of 1 year. After completion of 1 year, the stored sample shall be equilibrated to test
laboratory conditions [nominal 23 °C (73 °F)]. 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. If the sample is in a
1-liter (1-quart) or smaller container, the character of the lower (or settled) layer shall be determined with a spatula
as specified in ASTM D869. If the sample is larger than 1 liter (1 quart), this step shall be omitted. 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 consistency of the enamel shall be
measured using the Krebs-Stormer viscometer. The enamel shall be applied to a test panel and after it has dried the
enamel film shall be examined for grains 0.8 mm (1/32 inch) in diameter, even larger gelatinous lumps, and streaks
caused by such grains or lumps. The condition of the product shall be as specified in 3.6.5.1.1.
4.7.9.2 Partially full container. A sample of enamel shall be prepared and tested in accordance with Method
3021.1 of FED-STD-141. After 48 hours inspect for skinning, livering, curdling, hard caking, or gummy sediment.
Examine for ease of mixing. The enamel shall be as specified in 3.6.5.1.2.
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