TT-P-645C
4.6.5 Flexibility. Flexibility shall be determined in accordance with ASTM D522. The paint shall be applied to a flat metal plate of approximately 31 gauge coated with a dry film thickness of 0.025±0.008 millimeter
(0.001±0.0003 inch) of paint manufactured to this specification by means of a doctor blade capable of yielding a dry film thickness of 0.025±0.008 millimeter (0.001±0.0003 inch). The panel shall be allowed to air-dry for 2 hours
then baked for 24 hours at 100 to 105 °C (212 to 221 °F). The panel shall then be removed from the oven and allowed to stand for 30 minutes at laboratory temperature [nominal 23 °C (73 °F)]. The panel shall then be bent
over a 3.2- millimeter (⅛-inch) mandrel or a tapered mandrel where the minimum diameter is 3.2 millimeters (⅛
inch) and the film examined at the bend under a magnification of five diameters. Flexibility shall be as specified in
3.4.3.
4.6.6 Condition in container. A container of the product in the size ordered shall be inspected. The product shall be equilibrated to test laboratory conditions [nominal 23 °C (73 °F)]. Evidence of pressure or vacuum in the unopened container shall be noted. The container shall then be opened and examined in accordance with Test Method 3011.3 of FED-STD-141 for evidence of skinning, corrosion of container interior, odor of putrefaction, rancidity or souring, gel bodies, and hard settling. If the sample is in a 1 liter (1 quart) or smaller container, the character of the lower (or settled) layer shall be determined with a spatula as specified in ASTM D869. If the sample is larger than 1 liter
(1 quart), this step shall be omitted. The paint shall be hand-stirred 300 stirs in 2 minutes with a spatula appropriate to the container, stirring so as to ensure uniform distribution of any settled material. Immediately after stirring, the consistency of the paint shall be measured using the Krebs-Stormer viscometer. The paint shall be applied to a test
panel and after it has dried, the paint film shall be examined for grains 0.8 millimeter (1/32 inch) in diameter, even larger gelatinous lumps, and streaks caused by such grains or lumps. The condition of the product shall be as specified in 3.4.5.
4.6.7 Storage stability.
4.6.7.1 Full container. Storage stability shall be tested in accordance with ASTM D1849. A container of the product of the size ordered shall be stored at the temperature recommended in the manufacturer's data sheet or ASTM F718 for a period of 1 year. After completion of 1 year, the stored sample shall be equilibrated to test laboratory conditions [nominal 23 °C (73 °F)]. Evidence of pressure or vacuum in the unopened container shall be noted. The container shall then be opened and examined in accordance with Test Method 3011.1 of FED-STD-141 for evidence of skinning, corrosion of container interior, odor of putrefaction, rancidity, or souring. If the sample is in a 1 liter (1 quart) or smaller container, the character of the lower (or settled) layer shall be determined with a spatula as specified in ASTM D869. If the sample is larger than 1 liter (1 quart), this step shall be omitted. The paint shall be hand-stirred 300 stirs in 2 minutes with a spatula appropriate to the container, stirring so as to ensure uniform distribution of any settled material. Immediately after stirring, the consistency of the paint shall be measured using the Krebs-Stormer viscometer. The paint shall be applied to a test panel and after it has dried, the paint film shall be examined for grains 0.8 millimeter (1/32 inch) in diameter, even larger gelatinous lumps, and streaks caused by such grains or lumps. The condition of the product shall be as specified in 3.4.5.1.1.
4.6.7.2 Partially filled container. A sample of paint shall be prepared and tested in accordance with Test Method 3021.1 of FED-STD-141. After 48 hours, the sample shall be inspected for skinning, livering, curdling, hard caking, or gummy sediment. The sample shall be examined for ease of mixing. The paint shall be as specified in 3.4.5.1.2.
4.6.8 Water resistance. A 0.076±0.025-millimeter (0.003±0.001-inch) film of the paint shall be spray applied on a panel prepared as specified in 4.6.1. The paint shall be cured at room temperature [approximately 22 °C (72 °F)] for
48 hours. Fifty percent of the panel shall be immersed in room temperature distilled water for 24 hours. The
condition shall be as specified in 3.4.8.
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