A-A-2786
Notes:
FED-STD-141 is available from GSA Business Service Centers in Boston, MA; New York, NY; Washington, DC; Philadelphia, PA; Atlanta, GA; Chicago, IL; Kansas City, MO; Fort Worth, TX; Denver, CO; San Francisco, CA; Los Angeles, CA; and Auburn, WA.
ASTM Standards are available from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.
NOTE 1. Panel preparation (all except flexibility). Test panels shall be 75 by 150 mm (3 by 6 inch) aluminum alloy (QQ-A-250/4, T3 temper) treated with materials meeting MIL-C-81706 to produce coatings conforming to MIL-C-5541. The test panel for flexibility shall be prepared in accordance with method 2012, FED-STD-141. The primer shall be sprayed to a dry-film thickness of 0.015-0.022 mm (0.0006 - 0.0009 inch). For tests requiring a topcoat, the primed panels (after 30 minutes drying) shall be coated with 2 coats of lacquer (TT-L-32, Blue 15193, NSN: 8010-00-598-6455) applied 30 minutes apart each with a dry film thickness of 0.020 - 0.025 mm (0.0008 - 0.0010 inch).
NOTE 2. Add 5 ml 25 percent aqueous KOH to 1/2 gram extracted pigment in a centrifuge tube. Agitate by shaking and centrifuge. A yellow color in the supermarket liquid indicates the presence of hexavalent chromium.
PREPARING ACTIVITY
GSA-FSS
Project 8010-0197
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