MIL-PRF-23236 Coating Systems For Ship StructuresThis specification covers four types of air pollution regulated ship and structure coatings that comply with the National Emission Standards for Hazardous Air Pollutants \(NESHAP\) for shipbuilding for state and federal regulations. There are nine classes of coating systems. There are four grades of coating systems based on temperature of application and cure. In addition to tanks, all paint systems qualified to this specification are suitable for use on any ship structures, interior or exterior, for corrosion control. Except for trace levels, all types are free of lead, chromium, cadmium, and asbestos \(see 3.2.3\). All types have levels of hazardous air pollutants \(HAPs\) that do not exceed applicable NESHAP levels \(see 3.2.2.2\). Dry Type V, VI, VII, and VIII coating residues and debris are non-hazardous waste under U.S. Environmental Protection Agency \(USEPA\) regulations in effect on the date of this specification. Type VII coating will not have any solvent added to either the base resin component or the hardener component.

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MIL-PRF-23236D

3.13 Aviation (JP-5 and F-76) fuel and gasoline (MOGAS and aviation gasoline) compatibility (all types,

Class 5 , all grades). When tested as specified in 4.5.4, the cured total coating system shall not contribute particulate

or chemical contamination that is detrimental to subsequent logistics or aircraft operation. Particulate contamination

occurs when solids, color bodies, and fuel reaction bodies are leached from the coating. Chemical contamination

manifests itself when the fuel becomes corrosive, shows increased existent gum, or suffers a loss in diethylene

bromide.

3.13.1 Fuel color. When tested as specified in 4.5.4.2, the cured total coating system shall not effect the color

of fuel or;

JP-5 fuel: Saybolt color difference shall be not greater than 2.

Aviation gas and MOGAS: There shall be no perceptible difference in color, turbidity, or precipitation.

3.13.2 Corrosion. When tested as specified in 4.5.4.3, JP-5 and aviation gas shall not become corrosive after

contact with the coating system.

3.13.3 Existent gum. When tested as specified in 4.5.4.4, the cured total coating system effect on existent gum

shall be as follows:

The difference in existent gum (unwashed) shall not be greater than 4 milligrams per 100 milliliters.

The difference in existent gum (washed) shall not be greater than 2 milligrams per 100 milliliters.

3.13.4 Solids (total sediment). When tested as specified in 4.5.4.5, the total cured coating system shall not

cause a difference in total sediment greater than 2 milligrams per liter.

3.13.5 Bromine. When tested as specified in 4.5.4.6, the effect of the total cured coating system on the

ethylene dibromide content of aviation gas shall be that the difference in bromine content shall not be greater than

10 percent.

3.14 Resistance to fuel and seawater at 32 C (90 F) (all types, Class 5, all grades). When tested as specified

in 4.5.2.4, coating:

Shall not chalk.

b. Shall not exhibit film failure such as peeling, blistering rated in excess of ASTM D714, blister size

number 4, Few. There shall be no surface imperfections (including peeling) larger than 1.5 millimeters

(0.0625 inch), and any blistering shall be unbroken. Type VII coating system shall have no surface or edge rusting.

Shall show no loss of apparent hardness and adhesion when examined visually and with a knife test.

3.15 Resistance to hot water - simulated boiler feedwater (all types, Class 11, all grades). When tested as

specified in 4.5.12, coating shall have no pinhole rusting. The ASTM D4541, Type II tester, adhesion of the tested

system to itself and the substrate shall be not less than 50 percent of that of the original coating before testing. There

shall be no blistering rated in excess of ASTM D714, blister size number 4, Few. There shall be no surface

imperfections (including peeling) larger than 1.5 millimeters (0.0625 inch), and any blistering shall be unbroken.

Type VII coating system shall have no edge rusting.