MIL-S-83318A(USAF)
4.5.4.2 THIS PARAGRAPH DOES NOT APPLY TO PURCHASES MADE BY THE U.S. GOVERNMENT. Minor variations in application requirements (viscosity of base compound and curing compound, flow, application time, assembly time, tack-free time, standard curing time, and fluid immersed curing time) may not be cause for rejection of a particular batch if the minor variation is acceptable to and approved by the procuring agency.
4.6 Test conditions. Standard laboratory test conditions shall be 77°F (25°C) and 50 +5 percent relative humidity. Unless otherwise specified, all test specimens shall be prepared and cured under these conditions. In addition, application time, tack-free time, and standard curing time shall be tested under standard laboratory conditions. Unless otherwise stated, other tests shall be conducted at a temperature of 77°F (25°C).
4.6.1 Standard tolerances. Unless otherwise specified, the following are standard tolerances:
Temperature +2°F (1°C) Days + 2 hours Hours + 5 minutes Minutes + 10 seconds
Inches (mm) + 0.010 inch (0.20 mm)
4.7 Preparation of test specimens
4.7.1 Chemical conversion coating application for aluminium panels
4.7.1.1 Coating preparation. A chemical conversion coating conforming to MIL-C-81706, Class IA, Form II, Method C shall be used for aluminium panels. It shall be prepared according to the manufacturer's instructions.
4.7.1.2 Panel preparation
a. Vapor degrease using 1-1-1 trichloroethane or solvent degrease using 1-1-1 trichloroethane or methyl ethyl ketone (MEK).
b. Alkaline detergent clean using MIL-C-87936 type I material or an equivalent commercially available alkaline cleaner. The cleaning may be accomplished by brushing, swabbing or soaking the panels in the detergent solution or by a combination of the above techniques. Rinse the cleaned panels in warm flowing tap water 60°F to 100°F, (16°C to
38°C) and check for cleanliness by observing for waterbreak free surface. If a waterbreak
occurs on the panel surfaces, return them to the detergent solution and repeat cleaning procedure until a waterbreak free surface is obtained.
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