MIL-PRF-24667C
4.4.2 Panel substrate material. Steel panels in accordance with 4.4.2.1 shall be used for all of the tests specified
in 4.5 which require test panels, except Type XI (unless otherwise noted within the particular test requirement).
Reinforced plastic in accordance with 4.4.2.2 shall be used for the tests specified in 4.5.3 and 4.5.8. Polished clean
stainless steel shall be used for tests specified in 4.5.6.1. Buffed high tensile steel and galvanized steel panels shall
be used for tests specified in 4.5.6.2.
4.4.2.1 Steel surfaces. Ordinary strength steel panels, in accordance with Grade A of MIL-S-22698, inch (3
millimeters) thick (nominal), except for the impact resistance test (see 4.5.3) and temperature resistance test (see
4.5.29) where panels shall be ¼ inch (6 millimeters) thick, shall be abrasive-blasted to a uniform near white-metal
finish in accordance with SSPC-SP 10 to a 3- to 4.5-mil (75- to 115-micrometer) angular profile, unless otherwise
specified herein. The panels shall then be cleaned with oil-free air or vacuum, and protected from moisture during
storage. The qualification test report shall indicate degree of surface preparation and the profile achieved.
4.4.2.1.1 Compromised steel surfaces. For Type VII materials, the steel panels for use in the tests in sections
4.5.3 and 4.5.8 shall not be abrasive blasted, but shall be prepared to a power tool cleaned surface in accordance with
SSPC-SP 3 with a 3.0 to 4.5 mil profile followed by SSPC-SP 1.
4.4.2.2 Reinforced plastic surface. Fiberglass surface coating shall be applied to an "A" face of AC plywood,
and shall consist of two layers of chopped strand mat, 1.5 oz/sq-ft, Owens-Corning M-721 or equivalent and one
surface layer of 10.5 oz/sq-yd woven cloth, style 7500, with amine-silane treatment. Fiberglass reinforcement shall
be applied in three sequential layers each well saturated and rolled or squeezed free of air bubbles, with a resin
system of Reichhold Chemicals 37-127 epoxy and 37-607 hardener at a ratio of 100 to 45 parts by weight
respectively, or equivalent. Final resin coat shall cover the glass fiber by 10-20 mils. The glass fiber shall meet the
requirements of SAE AMSC9084, Type XII or Type XIIA, Class 2. The covering shall be allowed to cure seven
days minimum. The surface shall be sanded smooth with 120 grit aluminum oxide.
4.4.2.3 Special hull treatment (SHT). SHT test panels shall be prepared using ordinary steel plate in
accordance with 4.4.2.1, 24 inches square by inches thick (600 millimeters square by 9 millimeters thick) shall be
coated with DTNSRDC 2844-1109 or 1110 epoxy paint, and the SHT adhered using DTNSRDC 2844-1102. The
SHT shall be applied so that there are a minimum of two seams present. The seams shall be filled with a system
compatible seam filler.
4.4.3 Preparation of test panels. Panels prepared as specified in 4.4.2 shall be primed with the primer, if any,
designated by the manufacturer (see 3.2 and 3.2.1). The primer film thickness on test panels shall be measured in
accordance with SSPC-PA 2 and shall be within a tolerance of 1 mil (±0.025 millimeters) of the manufacturer's
recommended thickness. The primer thickness shall be listed in the qualification report. If a range is given for the
primer thickness, the minimum number shall be used for testing purposes except for those tests in section 4.5.3 and
4.5.8 where the maximum number shall be used. The primer shall be allowed to dry for the time specified by the
manufacturer (see 3.33). The intermediate coats, if any, and topcoat shall be mixed, kept at standard conditions
during the induction time, if any, applied, as specified in the manufacturer's instructions (see 3.33), and allowed to
cure for 14 days at standard conditions unless otherwise specified in the test method. Testing of Type VI materials
shall begin immediately following 3 days of cure. Testing of Type VII materials shall begin immediately following
24 hours of cure. Unless otherwise stated by the manufacturer's ASTM F718, Type VIII materials shall be applied
and cured at 35 °F (2 °C).
4.4.3.1 Type XI. The surface of the test panels to which the deck covering is attached shall be free from all
rust, scale, and organic matter. The non-skid system shall be applied to the test panels, including sealing compound,
and allowed to cure for 48 hours at room temperature before conducting tests.
4.5 Tests. Tests shall be conducted in accordance with the procedures specified herein. Each result shall be
compared with the applicable requirement in section 3, and evaluated for qualification (see table XIII).
4.5.1 Coefficient of friction. The COF shall be determined as follows and shall be in accordance with the
requirements of 3.4.
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