TT-P-28H
4.5.8 Storage stability.
4.5.8.1 Partially full container (type I). Determine skinning after 48 hours in accordance with method 3021 of FED- STD-141 and observe for compliance with 3.4.2.1. Reseal, tape lid and all glass areas with masking tape. Place taped jar in gallon can with loose fitting lid and expose to 7 days of heating at 52 °C (125 °F). Observe sample cautiously for first few days to note rupture of jar or leakage. Cool test assembly to room temperature and handle with caution when opening jar. Contents shall be in accordance with the requirements of 3.4.2.1 (heat aged requirement).
4.5.8.2 Full container (type I). In accordance with method 3022 of FED-STD-141, allow a full standard quart can
of the paint to stand undisturbed for 1 year and then examine the contents. Evaluate pigment settling or caking as in
4.5.7 except agitate the can for 5 minutes on the paint shaker prior to re-examination. Properties shall be in accordance with 3.4.2.2.
4.5.8.3 Storage stability (type II). Two unopened containers of Type II powder coatings shall be stored in a room maintained at or below 27 °C (80 °F) and at relative humidity of 50 percent for one year from the date of manufacture. Check for compliance with 3.4.2.3.
4.5.9 Brushing properties (type I). Apply the paint as packaged using a 6-cm (2½-inch) brush to a dry film thickness of 20.3 to 30.5 microns (0.8 to 1.2 mils) and observe for brushing properties in accordance with method
4321 of FED-STD-141, as well as for flow and leveling properties, a smooth uniform film, seeds, runs, sags, or streaks. Brushing properties shall be in accordance with the requirements of 3.4.3.
4.5.10 Spraying properties (type I). Spray the paint in accordance with manufacturer instructions, on a steel panel to a dry film thickness of 20.3 to 30.5 microns (0.8 to 1.2 mils) and observe for spraying properties in accordance with method 4331 of FED-STD-141, as well as for running, sagging, streaking, dusting, mottling, smoothness, and uniformity. For referee test use automatic application in accordance with method 2131 of FED-STD-141. Spraying properties and drying shall be in accordance with the requirements of 3.4.4.
4.5.10.1 Spraying properties (type II). Powder shall be spray applied to five panels at the dry film thickness recommended by the coating manufacturer (nominal 3 mils) by accepted industrial methods for applying powder coatings. The coating shall comply with 3.4.4.1.
4.5.11 Heat resistance testing of type I (liquid heat resistant paint) and type II powder coatings.
4.5.11.1 Hot-rolled steel. This applies to either Type I liquid paints or Type II powder coatings.
4.5.11.1.1 Panel preparation. For each test paint, select eight panels which are completely free of loose mill scale and have been cut out to 8 by 15 cm (3 by 6 inch) from 14 gauge low-carbon steel conforming to ASTM A1011/1011M. Remove mill scale and rust by any means desired prior to solvent cleaning. Solvent clean to SSPC- SP 1. Type I paints shall be sprayed in one coat to a total dry film thickness between 20.3 to 30.5 microns (0.8 to
1.2 mils), then air dried for at least 24 hours. Type II powder coatings shall be applied in accordance with 4.5.10.1.
4.5.11.1.2 Heat test. Following panel preparation in accordance with 4.5.11.1.1, place the panels in an oven on a suitable rack or holder so that no part of the panels are in direct contact with the bottom or sides of the oven and subject to the following heating schedule of nominal temperatures:
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