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

4.5.11.5 Phenol leaching (Class 9). After 4.5.11.4 testing is completed, remove coating from the polyethylene

surface. (Note: Alternate method if coating cannot be removed from polyethylene surface, cast free films of each

coating of the coating system. Cure at ambient laboratory conditions for 7 days.) Pulverize the coating film sample.

(Note: If using alternate method, use equal weights of each coating of the coating system.) Sieve pulverized

particles through a U.S. sieve number 50. A 1-gram (nominal) sample of the sieved material shall be placed on a

paper thimble and lowered into a Soxhlet extractor. The 500-milliliter flask in this assembly shall be filled with

300 milliliters of ASTM D1193 (any type) distilled water and several boiling chips. The sample shall be refluxed

until a least four complete siphonings of the sample chamber has occurred (several hours). Pour off the liquid into a

tightly sealed, clean glass flask for phenolic concentration testing. Determine phenolic compound concentration as

specified in APHA 5530C or APHA 5530D. Phenolic compound concentration for each coating of the coating

system shall be as specified in the requirements of 3.4.6.

4.5.12 Resistance to hot water - simulated boiler feedwater (all types, Class 11, all grades). Class 8 panels shall

be prepared in accordance with 4.5.2. Test panels shall be immersed to 150 millimeters (6 inches) of the

300-millimeter (12-inch length in 82 �C (180 �F) distilled water in a beaker for 500 hours or to prior failure. The

panel shall be removed, immediately examined. The extent, nature, and time of failure shall be reported in

accordance with the requirements of 3.15.

4.5.13 Resistance to chemical solutions - simulated collection, holding, and transfer tanks (CHT; sewage

waste) (all types, Class 13, all grades). Paint system test panels shall be prepared as specified in 4.5.2. Test panels

shall be tested to the following cycle:

a. Immerse test panels in a solution consisting of Acetic acid in ASTM D1141 substitute or natural ocean

water (solution I) adjusted to a pH of 3.8 to 4.0 for 14 days at a temperature of 21�2.7 �C (70�5 �F).

b. Remove from solution I and immerse panels in a solution consisting of 10 parts concentrated ammonium

hydroxide in 90 parts ASTM D1141 substitute or natural ocean water (solution II) for 14 days at a temperature of

21�2.7 �C (70�5 �F).

c. Remove from solution II and immerse panels in a solution consisting of 7 parts concentrated sulfuric acid

in 93 parts ASTM D1141 substitute or natural ocean water (solution III) for 14 days at a temperature of 21�2.7 �C

(70�5 �F).

d. Remove from solution III and immerse panels in a solution consisting of 10 parts Urea in 90 parts ASTM

D1141 substitute or natural ocean water (solution IV) for 14 days at a temperature of 21�2.7 �C (70�5 �F).

e. Remove from solution IV and immerse panels in 2 parts detergent (commercial solid dishwasher detergent)

and 98 parts ASTM D1141 substitute or natural ocean water (solution V) for 14 days at a temperature of 21�2.7 �C

(70�5 �F).

Operations (a) to (e) constitute one complete test cycle (70 days). This cycle is repeated for a total test time of

140 days (20 weeks) and coating deterioration reported after each complete cycle. Care shall be taken not to

contaminate solutions with carry-over of solution between immersions. Panels may be rinsed if desired. Solutions

shall be tested, refreshed, or replaced as necessary to maintain solution composition. Coating system shall be

evaluated for pinhole corrosion, ASTM D4541, Type II tester, adhesion of the original surfaces, ASTM D4541,

Type II tester, adhesion of both original and recoated surfaces, blistering, and surface imperfections larger than 1.5

millimeters (0.0625 inch) in diameter. Coating systems shall be evaluated for edge rusting. Coating performance

shall be as specified in 3.16 (see also 6.1.1.3).

4.5.14 Resistance to condensing water - simulated tank top test (all types, all classes, all grades). Panels shall

be prepared as specified in 4.5.2. Expose test panels in a condensing cabinet as specified in ASTM D4585 for

2000 hours at 38 �C (100 �F). Coating system shall be evaluated for pinhole corrosion, ASTM D4541, Type II

tester, adhesion of both original and recoated surfaces, blistering and surface imperfections larger than

1.5 millimeters (0.0625 inch) in diameter. Coating systems shall be evaluated for edge rusting. Test results shall be

as specified in 3.17.