MIL-PRF-24635E
3. REQUIREMENTS
3.1 Qualification. The coatings furnished under this specification shall be products that are authorized by the
qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3).
3.2 Composition. With the exception of the vehicle resin, the manufacturer is given his choice of ingredients
used in the formation of the coatings described in this document. For two component coatings, the allowed
proportions for the ratio of resin component to hardener shall be limited to 4:1, 3:1, 2:1, or 1:1 by volume. When
mixed and applied in accordance with the manufacturer's instructions, the final coating system shall be in
accordance with all requirements of this specification.
3.3 Ozone-depleting substances (ODS). The use of any ODS in the composition of the coating under this
specification, directly or referenced in any test method, is prohibited. Class I or Class II ozone-depleting chemicals
are defined by 40 CFR 82.
3.4 Application. The coatings under this specification shall be able to be applied either directly to bare steel or
aluminum surfaces prepared to SSPC-SP11 or better, or shall be able to be applied over substrates that have
previously been coated with the same product, or anti-corrosive primers of systems conforming to MIL-PRF-23236,
MIL-DTL-24441, MIL-PRF-24647, or TT-P-645.
3.5 Performance requirements.
3.5.1 Toxicity. The coating shall have no adverse effect on the health of personnel when used for its intended
purpose. The material used in the coating shall have no known carcinogenic materials identified by Occupational
Safety and Health Administration (OSHA) (29 CFR 1990) as regulated carcinogens, or International Agency for
Research on Cancer (IARC) latest monographs, or the latest annual Report on Carcinogens from the National
Toxicology Program (NTP); and shall have no extremely hazardous substances (EHS) or toxic chemicals identified
in 29 CFR 1910.1000, 40 CFR 302, 355, and 372, respectively. The manufacturer is responsible for maintaining
carcinogenic free, EHS free and toxic chemical free materials. The manufacturer shall not, unless specific material
maximum levels are cited herein, allow the addition of any of these prohibited materials to the formulation; and
when any of these prohibited materials are/may be present, as a result of being present as a trace or impurity in other
ingredient(s), the concentration of the prohibited material shall be less than 0.1 percent by weight of the coating.
The material shall be evaluated at the Navy and Marine Corps Public Health Center (NMCPHC) (see 6.5).
3.5.1.1 Asbestos content. The percent by weight of asbestos in the dry coating film shall be less than 0.5
percent by weight of the dry film of coating.
3.5.1.2 Metal content. The metal content (soluble and total) of the coating shall be less than the values listed in
table I when tested in accordance with 4.5.1.2. If the test for total metal results in a value less than the soluble metal
limit, the soluble metal test need not be conducted. The soluble metal and total metal values shall be reported in
table I results.
TABLE I. Metals content of coatings.
Soluble metal,
Total content,
Metal and its compound in each coating dry film
maximum
maximum
(mg/L)
(%WT)
Antimony
15.0
0.015
Arsenic
5.0
0.005
Barium (excluding barite)
100.0
0.10
Beryllium
0.75
0.0002
Cadmium
1.0
0.0005
Chromium VI compounds
1.0
0.001
Chromium and chromium III compounds
560.0
0.56
Cobalt1/
50.0
0.005
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