MIL-PRF-4556F
3.4.1.1 Lead and chromate (hexavalent) content. When tested as specified, the
lead content shall not exceed 0.06 percent by weight of the total non-volatile
content and the test for hexavalent chromium shall be negative.
3.4.2
Vehicle.
3.4.2.1 Component A. Component A shall consist of epoxy resins, pigments,
extenders, additives and solvents in any ratio necessary to meet the requirements
of this specification.
3.4.2.2 Component B. Component B shall consist of polyamides, polyamidoamines,
polyamines, and polyamine adducts in any ratio necessary to meet the requirements
of this specification.
3.4.3 Solvents. The coating shall not contain any benzene, chlorinated compounds
or ethylene based glycol ethers and their acetates. Solvents used shall meet the
requirements of 3.2.3.
3.4.4 Volatile organic content (VOC). When tested according to 4.3.2, the
volatile organic content of the mixed coating shall not exceed 340 grams/liter.
3.5
Qualitative Requirements.
3.5.1 Mixed coatinq. The mixed primer and topcoat shall individually conform to
the quantitative requirements of table I when tested as specified in section 4.
TABLE I. Quantitative requirements.
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Requirements
Characteristics
Minimum
Maximum
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Total pigment, percent of nonvolatile
60
Viscosity, KU
90
Flash point, °F
95
Dry time
Set-to-touch
5
Dry hard, hours
18
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3.6
Qualitative requirements.
3.6.1
Condition in container.
3.6.1.1 Component A. When tested as specified in 4.3.10.1, component A shall be
free from grit, seeds, skins, abnormal thickening, livering or other defects in a
freshly opened container and shall show no more pigment settling or caking than
can be easily and completely reincorporated into a smooth, uniform, homogeneous
state.
3.6.1.2 Component B. When tested as specified in 4.3.10.2, component B shall be
clear and free from sediment and suspended matter. It shall show no livering,
curdling, gelling or skinning in a freshly opened containter.
3.6.2
Storage Stability.
4
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