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

4.5.4.1 Preparation for fuel samples for test.

a. Apply coating system to four steel rods, 19 by 190 millimeters (0.75 by 7.5 inches), drilled, threaded, and

fitted with a 3- by 19-millimeter (0.125- by 0.75-inch) all-thread bolt for suspension. Allow 7 days drying time at

ambient laboratory temperature after application of last coat before immersion in fuel.

b. Prepare approximately 5 liters each of particle-free aviation gas and JP-5 fuel by repeated filtration through

a Type AA millipore filter as specified in Appendix X of ASTM and Other Specifications and Classifications for

Petroleum Products and Lubricants, using 100/130 aviation gas in accordance with ASTM D910 or commercial

100LL aviation gasoline, and JP-5 fuel in accordance with MIL-DTL-5624.

c. Wash coated test rods thoroughly with hot water at 82�6 C (180 � 10 F) for 15 to 30 minutes, drain, and

dry. Mount test rod on a 6- by 180-millimeter (0.25- by 7-inch) square plastic beaker cover (for a 4-liter beaker),

center drilled for mounting test rod.

d. Into four clean 2-liter beakers, pour 1000 to 2000 milliliters of particle-free aviation gasoline. Into four

clean 2-liter beakers, pour 1000 to 2000 milliliters of particle-free JP-5 fuel. Cover two beakers of each fuel with

rod-mounted cover (for exposed fuel samples). Cover two beakers of each fuel with 6 by 180 millimeters (0.25 by

7 inches) square plastic beaker covers, plain (for unexposed fuel samples). Store all beakers with fuel in the dark

and maintain at 27�6 C (80�10 F) for 30 days. Swirl fuel by rotating beakers at least three times daily.

e. On the 31st exposure day, test the exposed and unexposed aviation and JP-5 fuel for color, corrosion,

existent gum, and solids. Test the exposed and unexposed aviation gas for bromine as specified in the following test

procedures.

4.5.4.2 Fuel color (Class 5 only). Color for JP-5 fuel shall be determined in accordance with ASTM D156.

Record the difference between exposed and unexposed fuels. Colors of exposed and unexposed aviation gas shall be

compared visually. Record the difference as pass or fail. Fuel color shall be as specified in 3.13.1.

4.5.4.3 Corrosion (Class 5 only). Corrosiveness of both exposed and unexposed fuels shall be determined in

accordance with ASTM D130. Corrosiveness shall be as specified in 3.13.2.

4.5.4.4 Existent gum (Class 5 only). Existent gum (both washed and unwashed) shall be determined in

accordance with ASTM D381. Determine the difference between exposed and unexposed fuels. Existent gum shall

be as specified in 3.13.3.

4.5.4.5 Solids (total sediment) (Class 5 only). Solids shall be determined in accordance with ASTM D910.

Solids shall be as specified in 3.13.4.

4.5.4.6 Bromine (Class 5 only). Bromine shall be determined on both exposed and unexposed fuels in

accordance with the following procedures:

4.5.4.6.1 Apparatus.

4.5.4.6.1.1 Decomposition. The apparatus used for decomposition of bromides by sodium in liquid ammonia

shall be as shown on Figure 1. The center neck of the 250-milliliter, 2-neck, round bottom flask carries a teflon

sealed, corrosion resistant, steel stirring assembly. The side neck shall be fitted with a 2-hole rubber stopper through

which pass an ammonia delivery tube and a vent protected by a drying tube containing Drierite or equal. After

charging the flask with liquid ammonia, the pictured rubber stopper shall be replaced with a 1-hole stopper fitted

with a vent tube, also protected by a drying tube.

4.5.4.6.1.2 Titration. The apparatus used for following the titration of bromide shall be a continuous indicating

hydrogen ion concentration (pH) meter such as the Beckman Model H-2 or equal, equipped with a glass electrode

and a silver electrode (see 4.5.4.6.3(c)). A titration set-up shall be used, such as shown on Figure 2, which shall

accurately deliver slip-drop quantities of silver nitrate.