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 II. Required identification characteristics � Continued.

Characteristic

Single component materials

Drying time to touch and dry hard time or

curing time in hr

Specular gloss (%)

Hiding power (contrast ratio)

Volatile organic content, g/L

Mixing instructions

Application instructions

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

grades, and applications.

3.5.1 Volatile organic content (VOC) solvent. When tested in accordance with 4.6.2, the VOC of appropriate

grades shall not exceed the value listed:

Grade

Maximum VOC

175 g/L

250 g/L

3.5.2 Class 3 volatiles. The volatile portion of the formulation for Class 3 coatings shall comply with the

classified requirements for NAVSEA submarine atmosphere control (see 6.3.1), when tested in accordance with

4.6.2.1.

3.5.3 Hazardous air pollutant (HAP) content. When evaluated as specified in 4.6.3, the content of HAP

solvents in each individual coating shall not be greater than the VOC limit prescribed for the specific grades. Within

this limitation and the requirement that the finished coating meet all the requirements of this specification, solvent

selection is the responsibility of the manufacturer.

3.5.4 Hazardous pigments and additives. When tested in accordance with 4.6.4, the content of each soluble

metal and the total content of each metal of the coating shall be less than the values listed in table III. In addition,

crystalline silica, asbestos, and asbestos from pigment shall not exceed 0.1 percent by weight.

TABLE III. Metals content of coatings.

Metal and/or its compound in each

Soluble metal,

Total metals content,

coating dry film

maximum, mg/L

maximum, wt%

Antimony

0.015

Arsenic

0.005

Barium (excluding barite)

100

0.10

Beryllium

0.75

0.0002

Cadmium

0.0005

Chromium (VI) compounds

0.001

Chromium (including chromium (III))

560

0.56

Cobalt1/

0.005