MIL-PRF-23236D
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. Although the different types of coating systems of this specification afford superior
protection for various shipboard tanks, structures, and similar ship applications, the coating systems are not
necessarily interchangeable or of equal merit for all kinds of tanks, structures, and conditions of application.
Class 10 coatings are not intended for new construction, but for limited touch-up only where localized repairs will
be no more than 3 percent of the total surface area. Classes 11, 12, and 13 are for use as appropriate in either new
construction or maintenance painting. Types VIII and VIIIa are powder coatings intended for use in severe marine
service such as immersion and wet space application.
6.1.1 Coating selection.
6.1.1.1 Types V, VI, VII, VIII, and VIIIa. Type V coatings are acceptable for use where environmental
regulations limit VOC of organic coatings to a maximum of 340 grams of solvent per liter of coating. Type VI
coatings have VOCs less than 250 grams per liter and Type VII coatings have VOCs of less than 150 grams per liter.
Types V, VI, VII, and VIII dried coating residues are non-hazardous waste under USEPA regulations in effect on
the date of this specification. All types contain less lead, chromium, cadmium, asbestos, and other hazardous
ingredients than OSHA regulations allow or restrict in effect on the date of this specification.
6.1.1.2 Proprietary products. Depending on local application conditions, the acquisition guidance in 6.2 may
also apply to selection of specific proprietary products within each type, class, and grade.
6.1.1.3 Alternate test for resistance to chemical solutions. In addition to the test procedure of 4.5.13, coating
systems proposed for qualification to Class 13 of this specification will be tested to the following protocol:
a. through e. As currently specified.
f.
Fourteen-day immersion in 10 percent fatty acid, 90 percent seawater.
g.
Fourteen-day immersion in 50 percent fatty acid, 50 percent seawater.
h.
Fourteen-day immersion in 100 percent fatty acid.
This alternate immersion resistance will not be required for qualification to this revision of this specification,
but may be required by subsequent amendments or revisions. Data generated by Navy testing to this alternate
requirement will be made available to manufacturers, for information purposes, who submit coating systems for
qualification to 3.16. This alternate testing will not affect current qualifications.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
Title, number, and date of this specification.
b.
Type, class, and grade required (see 1.2).
c.
d. Packaging and labeling requirements (see 5.1 and 6.7). (Attention is directed to regulatory and safety
requirements for labels.)
6.2.1 Acquisition guidance. Coatings in accordance with this specification vary to some extent in surface
preparation required, and the effect of high humidity, slight surface moisture, and temperature during applications.
Requirements for specific products can be found in contractor's instructions. Many factors affect the total overall
cost per square foot per year for tank applications, possibly the least of which is the cost of the coating systems
which average about 10 percent of the total cost. The number of coats per coating system and square foot coverage
per liter, per gallon, or per pound further complicate the equity of purchase solely on the basis of lowest cost per liter
or cost per gallon. Contracting officers should therefore fully consider such factors.
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