MIL-PRF-24667C
4.5.17 Pot life (types I-X). Separate samples of each individual coating of the non-skid coating system
sufficient to fill a standard 1 quart (1 liter) can to within ½ inch (13 millimeters) of the top shall be conditioned and
mixed in accordance with the manufacturer's ASTM F718 directions at 50, 75 and 90 °F (10, 24, and 32 °C)
respectively, except for Type VIII, which shall be conditioned and mixed at 35 °F (2 °C). If an induction time is
called for in the directions, the mixed components shall be kept at the mixing temperature during the induction time.
The pot life shall be measured from the end of the induction time, if any, and the mixed coating shall be held at the
temperature specified for the pot life. Minimum pot life for each type shall be in accordance with the requirements
of 3.20. None of the mixed coating shall be removed for other tests during the determination of the pot life. At the
end of the specified pot life, the coating shall meet all the requirements of 3.20. For conformance inspection only,
compliance shall be determined by evaluating application properties (see 4.5.12) when applied to primed 6- by 6- by
¼-inch (150- by 150- by 3-millimeter) (nominal) steel plates, and following up with impact testing (see 4.5.3) at 4
days cure.
4.5.18 Fire resistance. The coating system shall be evaluated in accordance with the procedure specified in
MIL-STD-1623. The average of three panels shall be used to determine conformance with the requirements of 3.21.
4.5.19 Flexibility (type III and X). The Type III or X coating shall be mixed, applied, and cured to the test
panel in accordance with the manufacturer's ASTM F718 data sheet for the complete system. The Type III or X
coating system test panel shall be tested over a 5-inch (127-millimeter) mandrel in accordance with ASTM F137
except bending shall be at 20 degrees at uniform rate. The panel shall be examined for cracking, breaking, or loss of
adhesion immediately after bending. The panels shall be prepared and tested in such a manner that the ridges in the
profile run parallel to the axis of the bend. Flexibility shall be in accordance with the requirements of 3.22.
4.5.20 Adhesion of the intermediate coat (type III only). The adhesion of the intermediate coat shall be
determined in accordance with ASTM D4541 for the primer and intermediate coat of the non-skid coating system.
Adhesion of the intermediate coat shall be in accordance with 3.23.
4.5.21 Immersion resistance (type X only). Four steel panels 12 by 6 by inches (300 by 150 by 3
millimeters) (nominal) shall be prepared as specified in 4.4.3. The edges and backside of the panels shall be primed
and coated with an anti-corrosive coating system such as MIL-PRF-23236, Grade A. Two of the sample panels shall
have a 4- by -inch (100- by 3-millimeter) scribe, on a 45-degree angle centered in the bottom half of the panel, cut
through the non-skid surface to bare metal. The panels shall then be completely immersed in either natural, or
ASTM D1141 synthetic, seawater for a period of 12 hours after which they shall be removed to dry conditions for a
period of 12 hours. This cycle shall be repeated for a period of 1 year, during which time the samples shall be
inspected at least monthly for failures as noted in 3.24. At the end of the one-year test period the sample plates shall
be removed, cleaned of any stains, and evaluated to the requirements of 3.24. The edges of the scribe shall be
probed with a knife to determine the distance of corrosion undercutting, if any. Failure to meet all requirements of
3.24 shall constitute a failure of this test.
4.5.22 Cathodic protection (CP) compatibility (type X only). Two steel panels 12 by 6 by inches (300 by
150 by 3 millimeters) (nominal) shall be prepared as specified in 4.4.3. The edges and backside of the panels shall
be primed and coated with an anti-corrosive coating system such as MIL-PRF-23236, Grade C. Each panel shall be
electrically connected to a commercial magnesium anode conforming to ASTM G8 and shall have a ¼-inch
(nominal) hole drilled through the coating to the metal at the center of the test panel. The electrical resistance
between a point on the surface of the anode and the metal in the drilled hole of the test panel shall be less than 0.01
ohm, when checked with an ohm meter. Connecting points on the test panel shall be coated with an epoxy
compound for insulation. The test panel shall be installed in a modified ASTM G8 test in such a manner as to
separate the test panel from the magnesium anode by two feet (nominal) for a period of 3 months. At the completion
of the 3-month test, inspect each test panel for peeling, flaking, blistering, dissolving, or other failure. Lifting,
peeling or undercutting around the drilled hole shall be measured. Test results shall be in accordance with the
requirements of 3.25.
4.5.23 Pressure cycling (type X only). Three panels prepared as specified in 4.4.2.3 shall be coated with non-
skid. The panels shall be placed into a pressure tank filled with fresh water and cycled from 0 to 600 psi (0 to 41.4
bars) for 2200 cycles. The pressure shall be held for one minute when pressure reaches less than 50 psi and when
pressure is at maximum, 600 psi (41.4 bars). At 1100 cycles and at completion of the test, the panel shall be
removed and inspected in accordance with the requirements in 3.26.
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