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

4.5.4.6.2 Materials and reagents. The following materials and reagents shall be required:

Dry ice and acetone for cooling

Drierite or equal

Ammonia

Sodium

Alcohol

Sodium hydroxide pellets

Ammonium persulfate

Sodium arsenite, 10 percent

Nitric acid (HNO3) approximately 20 percent

Silver nitrate (AgNO3), 0.05N

4.5.4.6.3 Procedure for the analysis of gasolines. The procedure for the analysis of decomposition of bromides

shall be as follows:

a. Cool the flask with a dry-ice, acetone slurry and introduce 15 grams of ammonia (see note 2). Replace the

rubber stopper carrying the delivery tube by the one fitted only with a protected vent. Add a cube of freshly cut

sodium, having an edge dimension of 5 millimeters (0.25 inch). Rotate the stirrer slowly by hand to partially

dissolve the metal. Add exactly 50 milliliters of the gasoline under test (see notes 3 and 4), remove the cooling bath,

and start the stirrer. As soon as the ammonia starts to evolve, disconnect the drying tube from the vent (see note 5).

Continue the stirring until the ammonia has evaporated (about 20 minutes for a 15-gram charge). If the

characteristic blue color of sodium in liquid ammonia should disappear during the earlier stages of the evaporation,

add another piece of sodium.

b. Upon evaporation of the ammonia, add 5 milliliters of alcohol to the mixture to decompose the excess

sodium. Next, add 30 milliliters of water and stir to aid in the extraction of inorganic salts. Remove the reaction

flask from the stirrer, wash down the stirrer with water, and transfer the contents to a separatory funnel. Separate the

aqueous layer and extract the organic layer with two additional 30-milliliter portions of water. Combine the three

aqueous extracts, evaporate to 50 milliliters, and cool slightly. If, at this point, the mixture is not clear and contains

a precipitate, filter and wash the paper several times with small portions of hot water. Evaporate the combined

filtrate and washings to 50 milliliters and cool slightly. Add 2 grams of sodium hydroxide pellets, followed by 2

grams of ammonium persulfate. After the solids have dissolved, boil the solution for 15 minutes (see notes 6 and 7).

Cool the solution slightly, add 10 milliliters of a 10 percent solution of sodium arsenite, boil for 10 minutes, and cool

to room temperature. Make the solution acid to phenolphthalein by adding HNO3 (20 percent) and determine the

bromides as given below (see note 8).