MIL-PRF-24667C
4.5.12 Application properties (types I-X). One 12 by 6 by inches (250 by 150 by 3 millimeters) (nominal)
primed steel panels shall be equilibrated at the temperature at which the application properties are to be determined.
Except for Type VIII, separate samples of each individual coating of the non-skid coating system shall be
conditioned, mixed and inducted for one-half of the specified pot life period for that temperature in accordance with
the manufacturer's ASTM F718 data sheet at 50, 75, and 90 °F (10, 24, and 32 °C), respectively. Coatings shall be
applied to the panels at the matching temperatures in accordance with the manufacturer's ASTM F718 instructions
to metal surfaces at 50, 75, and 120 °F (10, 24, and 49 °C), respectively. Separate samples of Type VIII materials
shall be stored for 24 hours at 68 °F (20 °C). Type VIII materials shall be applied and cured at 36 °F (2 °C).
Spraying, or rolling properties shall be in accordance with 3.15, as appropriate. For this test, material from the pot
life test specified in 4.5.17 shall not be used. Type I, II, III, V, VII, VIII, or IX and X (where required by the
manufacturer's ASTM F718 data sheet) coating shall be spread over the panel with a roller, and then rolled in one
direction to produce the characteristic rolled appearance (see 3.14). Type IV or IX and X (where required by the
manufacturer's ASTM F718 data sheet) material shall be sprayed in several passes to produce a uniform finish (see
3.14). Type IX material shall be applied by the method specified in the manufacturer's ASTM F718 data sheet.
During mixing and application, the coating shall be observed and evaluated for conformance with 3.15. These
panels may be used for the drying time test in 4.5.16.
4.5.13 Color (types I-X). Compare a sample plate prepared in accordance with 4.4.3 to the appropriate FED-
STD-595 color chip. The results shall be in accordance with the requirements of 3.16. Color toppings shall be
mixed in accordance with the manufacturer's ASTM F718 data sheet. Draw down the color topping on separate
glass panels using a sufficient number of successive crosscoats (each having a wet film thickness (WFT) of 0.003"
or 3 mils) so that additional coats produce no noticeable change in color. Dry at ambient laboratory conditions for
24 hours after each coat. Compare the sample to the appropriate FED-STD-595 color chip. The results shall be in
compliance with 3.16.
4.5.14 Condition in container (types I-X). The liquid one-part coating, or components of two-part coatings,
shall be examined in accordance with method 3011.1 of FED-STD-141 for the defects specified in 3.17. The
presence of ingredients which cannot be redispersed within 5 minutes by hand stirring with a paddle for a 1-gallon
(4-liter) or smaller quantities or stirring (agitation) with a power mixer or mechanical shaker for 5-gallon (19-liter)
quantities shall constitute a failure of this requirement. Condition in container shall be in accordance with the
requirements of 3.17.
4.5.15 Coverage (types I-X). One 36- by 36- by -inch (914- by 914- by 3-millimeter) steel panel shall be
prepared as specified in 4.4.3. Coverage shall meet the requirements in 3.18.1, 3.18.2, and 3.18.3. For Type III
coatings, the primer, intermediate coats, and topcoat shall be separately applied with curing times observed in
accordance with the directions provided in 3.33. Before applying subsequent coats of the system, each individual
coat of the system shall be weight-determined using the formula below.
Coverage = (Area x Mass/Unit Volume) / (Mass 2 - Mass 1)
Where:
Area
=
914 by 914 (36 by 36)
Mass/unit volume
=
weight per kilogram/liter [kg/L] or pounds per gallon [lbs/gal] material (not
including container weight, see table III)
Mass 1
=
weight of panel before application
Mass 2
=
weight of panel after application
4.5.16 Drying time (types I-X). Three 6- by 6- by -inch (150- by 150- by 3-millimeter) (nominal) panels shall
be prepared in accordance with 4.5.12 each at one of the temperatures specified in 3.19 and maintained at that
temperature. The drying time of the primer and intermediate coats shall be determined by applying the subsequent
coat at the minimum allowable drying time for that temperature. The finished panels shall be kept at the specified
temperature for the allowable drying time. Immediately, 16 layers of Kaydry wipers or equivalent shall be placed on
to the surface of the coating system and a 5-pound (2.25-kilogram) cylindrical weight with a diameter of 2.6 inches
(66 millimeters) placed on the tissue. After 15 minutes, the weight shall be removed and the paper examined.
Staining or discoloration on the paper caused by the coating indicates failure of this test. The appearance of these
panels shall be evaluated as specified in 4.5.11 and shall be in accordance with the requirements of 3.19.
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