MIL-PRF-24647E
(1) The testing shall consist of test panels subjected to a static exposure for a 2-4 month period [in
Biscayne Bay, Florida; Daytona Beach, Florida; or Pearl Harbor, Hawaii followed by flow channel testing
(ASTM D4938)]. This process is one cycle. The total test shall include a minimum of 4 and a maximum of 8 cycles
or extend nominally 1 to 2 years in duration. Testing shall be completed until at least one observation of 25 percent
hard-fouling and one observation of 40 percent hard-fouling (i.e., barnacles, encrusting bryozoa, and tubeworms)
occurs following the static period or the maximum of 8 test cycles are completed.
(2) Each test panel shall be 6 inches by 12 inches by 0.125 inches thick. Four panels shall be subjected to
testing. Test panels shall be exposed nominally 1 meter below the waterline. The test surface shall face horizontal
down. (Only one side of the panel shall serve as the test surface.) The backside of the panel shall be coated with a
nontoxic material and secured in such a fashion to a backing plate to discourage fouling on this surface.
(3) For testing, the panel shall be removed from the static test site and immersed into a flow channel
apparatus for testing in general accordance with ASTM D4938. Single-sided exposure of the test surface is
acceptable. Should the flow channel not be co-located with the exposure site, transportation of the panels is
acceptable provided that: (a) they are maintained in a wet condition immersed in a sample of the local seawater, and
(b) the transportation and flow channel testing can be initiated within 36 hours.
(4) Within the flow channel, two panels shall be installed in the test section with a maximum velocity of
20 knots. Two shall be installed in the section with a maximum velocity of 30 knots.
(5) The flow channel shall allow for incremental velocity testing up to the test speeds. The initial velocity
(in the 20-knot section) shall be in the range of 3-6 knots. Increments in the test velocity shall be about 8 percent.
The flow channel shall be run with fresh, natural seawater. A maximum temperature rise of 5 °C is allowed between
the background temperature and the test temperature. The complete test run shall extend for 36 hours (nominally).
(6) At the conclusion of the flow channel run, the panels shall be removed from the test, photographed,
and returned to the static exposure site. Panel shall remain wet in seawater during all phases of testing and
transportation.
j.
Type IIIa shall be tested as above for Type III paints, except that the flow channel velocity shall be 10
knots.
4.4.1.2 Ship test. Ship tests (patch and full) shall:
a. Have individual paints of the total system applied and cured in accordance with the requirements of the
manufacturer s ASTM F718 product data sheet for those products (see 3.3).
b. Have the test ship(s) operate in high biofouling tropical or sub-tropical areas such as the Caribbean,
Mediterranean, or Western Pacific. Ship antifouling coatings shall not be underwater scrubbed or otherwise
maintained. Data from ships subject to underwater hull cleaning shall not be accepted.
c. Have ship inspections conducted in accordance with ASTM F1130. Rating of waterborne ships shall be in
accordance with standard industry practices. Record:
(1) Checking in accordance with ASTM D660.
(2) Cracking in accordance with ASTM D661.
(3) Blistering in accordance with ASTM D714.
d. Biofouling or physical failure due to verifiable physical damage that has removed the anticorrosive paint to
the steel hull or removed the antifouling paint to the anticorrosive layers may be subtracted from the percentage area
biofouled or anticorrosive paint failure.
e. Have patch tests of 3 meters (10 feet) in width (minimum) located amidships with underwater hull systems
running from the keel to the heavy load line and boottop systems running from the heavy load line to the light load
line. Patch tests shall include:
(1) A 3-meter (10-foot) wide (minimum) section of the antifouling component of the paint system being
qualified, applied over a standard NAVSEA-approved antifouling system.
(2) A 3-meter (10-foot) wide (minimum) section of a NAVSEA-approved antifouling system, for
comparison, if a NAVSEA-approved antifouling system is not applied to the test ship. This shall be of the same
class and type as the system being qualified (i.e., one shall use a Type I, Class 1 coating as a control for a Type I,
Class 1 qualification process.)
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