MIL-PRF-24635E
3.5.2 Vehicle resin (types II, III, and IV only). The vehicle shall consist of a copolymerized, air-drying silicone
modified long oil soya alkyd conforming to the requirements of table III.
TABLE III. Characteristics of vehicle.
Requirements
Characteristics
Min.
Max.
14.7
--
Silica (SiO2) percent by weight of
nonvolatile vehicle
Phthalic anhydride, percent by weight of
Positive
nonvolatile vehicle
(by certification)
Drying oil acids, percent by weight of
Positive
nonvolatile vehicle
(by certification)
Soya oil
Positive
(by certification)
Rosin
Negative
(by certification)
Phenolic resin
Negative
(by certification)
3.5.2.1 Identification spectra. The copolymer shall give two similar spectra, both of which shall have the
significant bands of both the alkyd and silicone resins as shown on figure 1. Both spectra shall not have an
absorption band in the 13.9 to 14.0 micrometer (μm) region and both shall show a sharp narrow absorption band at
7.0 μm.
FIGURE 1. Wavelength (micrometers).
3.5.3 Flash point. The flash point of the coating or any component shall be greater than 100 °F (38 °C).
3.5.4 Condition in container. The coating system or components shall be free of grit, seeds, skins, lumps or
livering, and shall show no more surface float (separated pigments or other ingredients on the surface of the liquid)
or pigment settling or caking than can be readily re-incorporated to a smooth uniform state.
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