TT-P-28H
4.5.12 Salt spray resistance.
4.5.12.1 Type I liquid paint. Remove the unscored panels from the 260 °C (500 °F), 316 °C (600 °F) and 484 °C (900 °F) heating periods of 4.5.11.1.2. Allow them to reach room temperature. Protect back and edges with separate applications of paint or wax. Expose the panels to the salt spray for 24 hours in accordance with ASTM B117. Upon removal, wash the panels gently in warm running water until free from any visible salt deposits and examine immediately for traces of rusting, blisters and dulling or staining unaccompanied by red rusting. When paint is removed from the panels tested, inspect the surface of the steel for rusting, pitting, or corrosion. Test panels shall be in accordance with the requirements of 3.4.6.
4.5.12.2 Cold-rolled steel, type I - ambient dry. Prepare three 10- by 30-cm (4- by 12-inch) (nominal), ASTM A1008/A1008M steel panels for each test paint as specified in 4.5.11.2.1 except, do not bake. Protect the back and edges with separate applications of paint or wax. Allow the test panels to cure for 14 days at ambient room temperature. Do not score the panels. Expose the unscored panels to the ASTM B117 salt spray for 96 hours. Upon removal, wash the panels gently in warm running water until free from any visible salt deposits and examine immediately for traces of rusting, blisters and dulling or staining unaccompanied by red rusting. When paint is
removed from the panels tested, inspect the surface of the steel for rusting, pitting, or corrosion. Test panels shall be in accordance with the requirements of 3.4.6.
4.5.12.3 Cold rolled steel, type I - heat cure. Prepare three 10- by 30-cm (4- by 12-inch) (nominal), ASTM A1008/A1008M steel panels for each test paint as specified in 4.5.11.2.1. Protect back and edges with separate applications of paint or wax. Do not score the panels. Expose the unscored panels to the salt spray for 96 hours in accordance with ASTM B117. Upon removal, wash the panels gently in warm running water until free from any visible salt deposits and examine immediately for traces of rusting, blisters and dulling or staining unaccompanied by red rusting. When paint is removed from the panels tested, inspect the surface of the steel for rusting, pitting, or corrosion. Test panels shall be in accordance with the requirements of 3.4.6.
4.5.12.4 Type II, powder coating. For Type II powder coated panels, remove from the 4.5.11.1.3 heat resistance
test after the 260 °C (500 °F), 316 °C (600 °F), and the 372 °C (700 °F) heating periods and then conduct the ASTM B117 salt spray test for 24 hours. Upon removal, wash the panels gently in warm running water until free from any visible salt deposits and examine immediately for traces of rusting, blisters and dulling, or staining unaccompanied by red rusting. When paint is removed from the panels tested, inspect the surface of the steel for rusting, pitting, or corrosion. Test panels shall be in accordance with the requirements of 3.4.6.
4.5.13 Water resistance. Prepare three test panels as specified in 4.5.11.2.1. Coat all exposed uncoated metal surfaces with wax or suitable coating and immerse the panel for 24 hours at 23 °C (73 °F) in accordance with ASTM D1308. Inspect for wrinkling or blistering immediately upon removal of the panel from the water. Two (2) hours after removal from test, inspect for significant effects. Inspect after 24 hours air drying for any changes in the
portion of the paint which was immersed when compared to the portion that was not immersed. The paint condition shall be in accordance with the requirements of 3.4.7.
4.5.14 Hydrocarbon fluid resistance. Prepare three test panels in accordance with 4.5.11.2.1. Immerse the panels for 4 hours in a hydrocarbon fluid conforming to JP8 at 25±1 °C (77±2 °F). Panels shall be immersed at a minimum depth of 50 percent. Examine the film of paint for wrinkling or blistering immediately after removal from the fluid. After air drying for 24 hours, examine the portion of the panel which was immersed with regard to hardness and knife adhesion in accordance with Method 6304.2 of FED-STD-141. Paint shall be in accordance with the requirements of 3.4.8.
4.5.15 Toxins, carcinogens, and reproductive stressors. The manufacturer shall have the formulations and associated toxicological information available for review by the Navy Environmental Health Center (NEHC) as directed by the qualifying activity. The toxicology shall be in accordance with the requirements of 3.4.9.
4.5.16 Water content (type I only). The water content shall be run on the vehicle as isolated in 4.5.4 using commercially available automated titration devices. Metrohm® Systems automated Karl Fischer titration device from Brinkmann Instruments or Photovolt Aquatest II from Photvolt Aquatest Co. are acceptable.
Check for compliance with Table I.
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