MIL-DTL-1115E
4.5.9.2 Partially filled 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 3.4.5.1.2.
4.5.10 Water resistance. Spray apply a 0.076 + 0.025 mm (0.003 + 0.001 inch) film of the enamel on a panel
prepared as specified in 4.5.1. Cure at room temperature [approximately 22 °C (72 °F)] for 48 hours. Immerse 50
percent of the panel in room temperature distilled water for 24 hours. The condition shall be as specified in 3.4.8.
4.5.11 Compatibility.
4.5.11.1 Compatibility with topcoats. Prepare and prime three panels as specified in 4.5.1. To the first panel
apply a 0.051 to 0.076 mm (0.002 to 0.003 inch; 2 to 3 mil) coating (topcoat) of paint manufactured to
MIL-PRF-24635; to the second panel apply a 0.051 to 0.076 mm (0.002 to 0.003 inch; 2 to 3 mil) topcoat of paint
qualified to MIL-PRF-24763, to the third panel apply a 0.051 to 0.076 mm (0.002 to 0.003 inch; 2 to 3 mil) topcoat
of the test enamel produced to this specification. After drying (curing the three panels for 48 hours at 50 °C (122
°F), cool to ambient laboratory conditions and apply a 0.051 to 0.076 mm (0.002 to 0.003 inch; 2 to 3 mil) topcoat of
the test enamel. Examine for blistering, wrinkling, or peeling of the enamel immediately after topcoat application
and 48 hours after topcoat application. Check adhesion 48 hours after topcoat application by Test Method B of
4.5.11.2 Compatibility with primers. Prepare and prime three panels as follows. To the first panel apply a
0.051 to 0.076 mm (2 to 3 mils) primer coating TT-P-645; to the second panel with 0.051 to 0.076 mm (2 to 3 mils)
of MIL-DTL-24441, F.150, Type III paint and to the third panel apply 0.051 to 0.076 mm (2 to 3 mils) of MIL-
DTL-24441, F.150, Type IV paint. Apply one coat at 0.051 to 0.076 mm (2 to 3 mils) DFT of the test enamel.
Examine for blistering, wrinkling, or peeling of the test enamel immediately after topcoat application and 48 hours
after topcoat application. Check adhesion 48 hours after topcoat application by Test Method B of ASTM D3359.
4.5.12 Color testing.
4.5.12.1 Instrumental color deviation determination. Test specimens shall be prepared in accordance with
ASTM D823 Test Methods C or E using a nominal 0.006-inch blade film applicator on to a clear plate glass of not
less than -inch (nominal) thickness, which has been ground to a uniform finish with 1F carborundum. A standard
black and white Leneta chart is also acceptable. The color deviation shall be determined in accordance with ASTM
D2244 using an instrument having a D65 light source (10-degree observer) or C (2-degree observer), a 45-degree
illumination angle, a 0-degree viewing angle. The instrument shall be calibrated in accordance with manufacturer
instructions and shall be demonstrated to read the color of National Institute for Science and Technology (NIST
[formerly National Bureau of Standards; NBS]) traceable standards with color deviations not greater than allowed in
3.4.2. After calibration of the instrument, measure the CIE color values of not less than two color number 17875 of
FED-STD-595 color cards which were received from the Government not greater than 1 year prior to the date of this
use. Make at least three readings per card taken at 1-inch intervals on the long axis, 1 inch from the edge. Calculate
ΔE for each color card. Determine the mean values of ΔE and the CIE color values for the color cards. If any
individual CIE color value differs from the mean color value by more than 0.05, use a different color card and
recalculate the mean values. These mean values will be used to calculate the color difference values. Measure the
CIE color values of the test enamel using the values of three readings taken at 1-inch intervals on the long axis, 1
inch from the edge. Calculate the mean CIE color values of the test enamel. Calculate the color difference terms. If
using an instrument that automatically calculates the color differences, enter the color card mean values as the base
line for the color difference calculations. The results of the color difference calculations shall be in accordance with
the requirements of 3.4.2.
4.5.12.2 Referee color matching. If the enamel measured in accordance with 4.5.12.1 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 tested in accordance with ASTM D823,
the test enamel, prepared as in 4.5.12.1, shall visually match the color number 17875 of FED-STD-595 color card
that most closely corresponds to the mean values calculated in 4.5.12.1. Color shall be in accordance with the
requirements of 3.4.2.
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