MIL-PRF-24647E
4.4 Test methods (all types). Test methods shall be as listed in table IV or as otherwise specified herein. The
requirements listed in table IV shall be tested in accordance with the applicable tests and test paragraphs listed
therein. Results of tests shall be in accordance with the requirements paragraph listed in table IV or in the test
paragraph.
4.4.1 Resistance to tropical biofouling organism attachment.
4.4.1.1 Panel test.
a.
Tests shall be conducted in Biscayne Bay, Florida; Daytona Beach, Florida; or Pearl Harbor, Hawaii.
b.
Tests shall include 12 test panels prepared for each paint system.
c.
Test panels shall be as follows:
(1) Class 1 panels shall be made of the steel specified in ASTM A1011/A1011M and a minimum of
3.175 millimeters (⅛ inch) thick.
(2) Aluminum test panels for Class 2 testing shall be ASTM B209 (alloy 5086 H112) and a minimum of
6.35 mm (¼ inch) or as approved by NAVSEA.
(3) Test panels for Class 3 testing shall be of the material to which the coating is to be applied.
(4) Surface preparation of all steel test panels shall be in accordance with SSPC-SP 10/NACE No. 2
procedures; aluminum test panels shall be free of all contamination including dirt, grease, oil, and corrosion product;
and elastomeric substrates shall be in accordance with the manufacturer s instructions.
d. Paint thicknesses of each individual coating and the total system shall be in accordance with the
manufacturer s ASTM F718 product data sheet.
e. Waterline immersion testing on six panels for each paint system shall be conducted in accordance with
ASTM D5479, and shallow submergence testing shall be conducted on the remaining six panels for each paint
system in accordance with ASTM D3623 for Type I, II, and IV paints. All panels in these tests shall be under
cathodic protection from a zinc anode. This shall be done with either an individual anode per panel or with a single
anode of sufficient capacity to polarize the entire set of test samples. Rate as follows:
(1) Fouling shall be rated in accordance with ASTM D6990 (for the purposes of fouling rating, the rating
shall be calculated by subtracting from 100 the percent of the surface area covered with fouling, not the sum of
individual species present).
(2) Checking shall be rated in accordance with ASTM D660.
(3) Cracking shall be rated in accordance with ASTM D661.
(4) Blistering shall be rated in accordance with ASTM D714.
(5) Inspect for exposed anticorrosive paint, as appropriate. Fouling at the panel edges shall be neglected.
Of the six panels in each test (waterline and shallow immersion), three shall be left undisturbed, under immersion for
the test duration. They shall not be rinsed in any fashion. The remainder may be removed on a regular schedule and
rinsed with low pressure water [<350 kPa (50 psi)] for inspection. At the end of the requisite exposure period, all
panels shall be low pressure rinsed, inspected, and rated.
f. Types I, II, and IV, all classes, all grades, Application 1 paints shall be tested for 12 months. Paint systems
shall meet the requirements of 3.4.4.1.1.
g. Types I and II, all classes, all grades, Application 2 paints shall be tested for 24 months, with an evaluation
made after 12 months. Paint systems shall meet the requirements of 3.4.4.1.1.
h. Types I and II, all classes, all grades, Application 3 paints shall be tested as in 4.4.1.1.g, and then show
sufficient ablation/erosion rates (see table IV) to meet the service life requirement.
i.
Testing of systems belonging to Type III, all classes, grades and applications shall be conducted as follows:
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