MIL-P-38336 Primer Coating, Inorganic, Zinc Dust Pigmented, Self-Curing, For Steel Surfaces S/S By Sae-Ams-P-38336

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MIL-P-38336A(USAF)

hours prior to coating.  The primer shall be thoroughly mixed in accordance with the manufacturers instructions. Unless specified a single coat of the primer shall be applied by spray or brush using a wet cross-coat, to a dry film thickness as specified in 3.5.1. The panel shall be in a nearly vertical position during spraying and for a least two minutes after completion of spraying.  Panels that are to be used for salt spray, humidity, or  other tests where corrosion or rusting of the panel is a factor shall be coated on both sides and, in addition, shall be dipcoated around the edges to a distance of approximately 1/8 inch.  The coated panels shall be air dried for a minimum of two hours and not more than four  hours prior to testing (see 4.6).

4.4.3.2. Wet surfaces.     The panels shall be prepared and coated as specified in 4.4.3.1,  except the panel surfaces shall be wet prior to primer application. The test panels shall be dipped in tap water, removed, and with a damp fine-pore sponge, smoothed to a bright, even coat of water. The panels shall then be immediately spray or brush coated with the primer and placed in a humidity cabinet at 90°F and 95 percent relative humidity.  Test panels shall cure dust free in one hour and cure through in not more than six hours. After curing, the panels shall be removed from the humidity cabinet and tested as specified in 4.6.

4.5. Test conditions.      Unless otherwise specified, all testing, conditioning, and curing,  shall be conducted under standard laboratory conditions of 75°F +2°F and 50 + 5 percent relative humidity.

4.6    Test methods

4.6.1   Methods of test.    The test methods of this specification shall be conducted in accordance with the applicable methods of ASTMs as listed in table II, and other methods as described in 4.6.2 through 4.6.18.

TABLE II.  TEST METHO0S

4.6.2 Zinc dust pigment.   The dry zinc dust pigment shall be tested according to the requirement of TT-P-460.

4.6.3  Zinc content.    The percentage of zinc dust in the dry film shall be determined as follows:  Using one unopened unit of primer (one container of liquid vehicle and the companion container of dry zinc dust) accurately determine the total weight of each component by comparing the weight of the full containers to that of identical, empty, clean containers. 0etermine the nonvolatile content of the liquid vehicle according to the method listed in table II. Calculate the percent of zinc dust in the dry film as follows:

A x 100             = 0

A + (BxC)

100

A = Weight of zinc dust

B  = Percentage of nonvolatile in the vehicle

C = Weight of vehicle

0 = Percentage of zinc in the dry film

Source:  https://assist.dla.mil  --  Do7wnloaded:  2014-09-30T21:22Z Check  the  source  to  verify  that  this  is  the  current  version  before  use.