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MIL-PRF-24596 Coating Compounds, Nonflaming, Fire-ResistantThis specification covers four classes and four grades of nonflaming, fire-resistant coatings which are suitable for use where volatile organic compound \(VOC\) content air pollution regulations apply for solvents in paints and for application over certain selected surfaces. Except for trace levels, all grades are free of lead, chromium, cadmium, and asbestos \(see 3.5.4\). All grades have levels of hazardous air pollutants \(HAPs\) that do not exceed applicable National Emission Standards for Hazardous Air Pollutants \(NESHAP\) levels \(see 3.5.3 and 3.9\). Dry coating residues and debris are non-hazardous waste under U.S. Environmental Protection Agency \(EPA\) regulations in effect on the date of this specification.

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MIL-PRF-24596B(SH)

TABLE III. Metals content of coatings � Continued.

Metal and/or its compound in each

Soluble metal,

Total metals content,

coating dry film

maximum, mg/L

maximum, wt%

Copper

0.01

Fluoride salts

180

0.18

Lead

0.005

Mercury

0.2

0.0002

Molybdenum

350

0.35

Nickel

0.02

Selenium

0.002

Silver

0.001

Tantalum

100

0.100

Thallium

0.007

Tungsten

100

0.100

Vanadium

0.01

Zinc

250

0.25

NOTE:

Total cobalt content may exceed 0.005 wt% (up to 0.2 wt%) only if a cobalt drier

is used to effect proper drying. Regardless of whether a cobalt drier is used,

soluble cobalt content may not exceed table III requirements.

3.5.5 Flash point. When tested in accordance with table IV, the flash point of the coating shall not be less than

38 �C.

3.5.6 Gloss. When tested in accordance with 4.6.1, specular gloss shall be not less than 45 percent and shall not

exceed 60 percent.

3.5.7 Yellowness. When tested in accordance with 4.6.5, the yellowness index of panels in light or dark storage

shall not increase more than 3 units.

3.6 Qualitative requirements. Unless otherwise stated in this section, the following tests apply to all classes,

grades, and applications.

3.6.1 Condition in container. When tested in accordance with table IV, the coating or components of a coating

system shall be free from grit, seeds, skins, abnormal thickening, or livering in a freshly opened container, and shall

show no more pigment settling or caking than can be easily and completely reincorporated to a smooth, uniform

state. Water-based paints shall also be free of rust staining, emulsion breakdown, spoilage, or rancidity. Container

shall be free of corrosion.

3.6.2 Mixing properties. When tested in accordance with 4.6.6, the coating shall be free from grit, seeds, skins,

or lumps, and shall result in a smooth, uniform mixture. After aging, the coating shall show no signs of gelation or

separation.

3.6.2.1 Pot life. When the coating components of a multi-component paint are mixed and tested in accordance

with 4.6.6.1, the pot life shall be as specified in table II.

3.6.3 Spraying properties. When tested in accordance with 4.6.7, the coating shall spray satisfactorily in all

respects, and shall show no running, sagging, or streaking. The dried film shall show no dusting, mottling, or color

separation and shall present a smooth finish.