MIL-PRF-24647E
b. 80 percent of the total panel surface shall be free of hard-fouling (i.e., barnacles, encrusting bryozoa,
tunicates, and tubeworms) after each test run at 20 knots and 85 percent of the surface shall be free of hard-fouling
after testing at 30 knots.
c. Areas shall not accumulate fouling over a 1-year cycle. Any hard-fouling not removed at the end of a test
cycle shall be noted. This fouling in this area would be expected to grow over the next static immersion period.
Under the next flow channel cycle, this fouling shall be exposed to more significant hydrodynamic forces and be
removed. This is to say, the 2nd flow channel run shall remove any fouling left from the 1st run, and the 3rd run shall
remove any fouling left after the 2nd run, etc.
d.
There shall be less than 1 percent of the antifouling coating affected by damage after the test period.
e. Type IIIa (only). There shall be 80 percent of the total panel surface free of hard-fouling (i.e., barnacles,
encrusting bryozoa, tunicates, and tubeworms) after testing at a 10-knot velocity in flow channel testing.
3.4.4.2 Ship tests. Ship tests shall meet the requirements of 3.4.4.2.1 and 3.4.4.2.2 when tested in accordance
with 4.4.1.2. Ratings will exclude areas (e.g., docking blocks) not coated with the antifouling materials.
3.4.4.2.1 Performance criteria. The test coating shall perform equal to or better than a qualified coating which
is applied to the entire underwater hull for patch testing, or as a patch for full ship testing. Performance criteria
include, but are not limited to, fouling control, ablation/erosion rate (if applicable), physical performance, and
cleaning requirements.
3.4.4.2.2 Length of testing. Testing (patch or full ship) performed on any Government vessel shall be for
12 months minimum; commercial vessels shall be for 24 months minimum.
3.4.4.2.3 Service life determination. The Government will monitor the performance of qualified products on
operational ships to establish compliance with the service life requirement for the appropriate application of the
paint system, as specified in 1.2.4.
3.4.5 Spraying properties. Each individual paint of the paint system, when mixed in accordance with
manufacturer s instructions as listed on its corresponding ASTM F718 product data sheet, shall spray satisfactorily
when tested as specified in 4.4.5. The dry film shall show no running, sagging, blooming, blushing, bubbling,
cratering, dusting, floating, fogging, hazing, mottling, orange peel appearance, pinholing, seeding, or streaking.
3.4.6 Brushing properties. Each individual paint of the paint system, mixed in accordance with the
ASTM F718 product data sheet, shall brush easily and have good flowing and spreading qualities when tested as
specified in 4.4.6. The dried film shall show no running, sagging, blooming, blushing, bubbling, cratering, dusting,
floating, fogging, hazing, mottling, orange peel appearance, pinholing, seeding, or streaking.
3.4.7 Rolling properties. Each individual paint of the paint system, mixed in accordance with ASTM F718,
shall roll easily and have good flowing and spreading qualities when tested as specified in 4.4.7. The dried film
shall show no running, sagging, blooming, blushing, bubbling, cratering, dusting, floating, fogging, hazing, mottling,
orange peel appearance, pinholing, seeding, or streaking.
3.4.8 Recoatability. When tested as specified in 4.4.2, a recoat layer of antifouling paint shall show no peeling,
flaking, or delamination from the overcoated antifouling paint layer. The recoat layer shall also meet all the
requirements of 3.4.4.1.1 for Type I, II, and IV paints and 3.4.4.1.3 for Type III and Type IIIa paints.
3.4.9 Cathodic protection (CP) compatibility. When tested as specified in 4.4.9, the test paint shall not peel,
flake, blister, dissolve, or otherwise fail. Lifting of the antifouling from the primer around the drilled hole shall not
exceed 12.7 millimeters (mm) [0.5 inches (in)]. This test shall not apply for coatings being qualified for Class 3
(elastomeric) substrates. Anticorrosive primers that have been tested and approved for CP compatibility in
accordance with MIL-PRF-23236 need not be retested under this specification.
3.4.10 Pressure cycling. Pressure cycling shall be performed to determine compatibility of the qualifying paint
system to Class 3 substrates for submarine service. NSWC-SSES Code 617 may be contacted for pressure cycling
requirements.
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