TT-P-1757B
3.3 Physical properties - liquid.
3.3.1 Fineness of grind. The fineness of grind of the primer coating shall be equal to or greater than 6 on the Hegmen scale, when tested in accordance with ASTM-D1210 (see 4.6).
3.3.2 Water content. The water content of the primer coating shall be less than or equal to
0.5 percent by weight when tested in accordance with ASTM-D1364 (see 4.6).
3.3.3 Viscosity. The viscosity of the primer coating shall be 16 to 25 seconds through a number 4 Ford Viscosity Cup, when tested at 77 ±5 F (25 ±3 C), in accordance with ASTM-D1200 (see 4.6).
3.3.4 Suspension properties. The primer coating shall completely redisperse to a smooth, homogeneous state, when tested in accordance with 4.6.2.
3.3.5 Condition in container. The primer coating shall be free from skins, lumps, grit, and pigment floatation or settling, when tested in accordance with FED-STD-141, methods 3011 and
3021 (see 4.6). Additionally, the primer coating shall be capable of being mixed to a smooth, homogeneous condition in the original container and when reduced for laboratory testing.
3.3.6 Coarse particles and skins. Coarse particles retention shall be less than or equal to 0.3 percent by weight of the total primer coating, when tested in accordance with FED-STD-141, method 4092 (see 4.6).
3.4 Working properties.
3.4.1 Non-pressurized container. The primer coating shall be a freely working product, capable of being spray applied to yield a smooth, uniform film, free from runs and/or sags, when applied in accordance with 4.5.1.
3.4.2 Pressurized (aerosol) container. The primer coating shall be capable of having 98 percent or more of the container contents applied in a pattern that deposits a smooth, uniform film, free from runs and/or sags, when applied in accordance with 4.5.1.
3.4.3 Drying time. The primer coating shall dry hard within 15 minutes of application, when tested in accordance with FED-STD-141, method 4061 (see 4.6).
3.4.4 Odor. The primer coating shall have no obnoxious odor before or during spraying, while drying, or as dry film, when tested in accordance with ASTM-D1296 (see 4.6).
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