TT-P-1757B
4.6.8.3 Water resistance.
4.6.8.3.1 Primer coating. The primer coating shall be applied to test panels in accordance with 4.5. and 4.5.1 and air dried for 48 hours. Immerse the test panels in distilled water at room temperature [25 ±3°C (77 ±5°F)] for 24 hours. Examine for conformance to 3.6.2.1.
4.6.8.3.2 Primer coating and topcoat. The primer coating shall be applied to test panels, in accordance with 4.5 and 4.5.1, and then topcoated in accordance with 4.5.2. Immerse the test panels in distilled water at room temperature [25 ±3°C (77 ±5°F)] for 24 hours. After removal, examine for conformance to 3.6.2.2.
4.6.9 Salt spray resistance. The primer coating shall be applied to test panels in accordance with 4.5 and 4.5.1. Two intersecting lines shall be scribed across the surface of each test panel, exposing the substrate. The panels shall then be placed in a 5 percent salt-spray cabinet for 1,000 hours, in accordance with ASTM-B117. Examine for conformance to 3.6.3.
4.6.10 Accelerated weathering. Accelerated weathering testing shall be conducted on test panels with primer coated only applied (see 4.6.10.1 and 4.6.10.3) and on test panels with primer coating with topcoat applied (see 4.6.10.2 and 4.6.10.3).
4.6.10.1 Primer coating. Apply the primer coating in accordance with 4.5 and 4.5.1. Perform the accelerated weathering test in accordance with 4.6.10.3.
4.6.10.2 Primer coating and topcoat. Apply the primer coating in accordance with 4.5 and
4.5.1. Apply the topcoat in accordance with 4.5.2. Perform the accelerated weathering test in accordance with 4.6.10.3.
4.6.10.3 Procedure. Expose the test panels for 500 hours in a xenon-arc weatherometer (Atlas Electric Devices Company or equivalent) that is cycling between 102 minutes of light only and 18 minutes of light and waterspray, operated in accordance with ASTM-G26,
Method 1, "Continuous Exposure to Light and Intermittent Exposure to Water Spray." Total exposure time shall be 500 hours. The following conditions shall apply when testing:
Apparatus type: BH
Black body temperature in cabinet: 60 ±3°C (140 ±5°F) Relative humidity in cabinet: 50 ±5 percent
Intensity of xenon-arc: 0.3 to 0.4 watts/meter2 at 340 nm
Examine for conformance to 3.7.
5. PACKAGING.
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