MIL-DTL-12276E(MR)
inspections set forth in the specification where such inspections are deemed necessary to
assure that supplies and services conform to prescribed requirements.
4.3 Test procedure.
4.3.1 Preparation of test panels. The phosphate coated test panels shall be purchased from a
commercial supplier (see 6.6). Prepare 7 sets of six panels divided into three groups of two
panels each of SAE 1010, 3 x 6 x 0.026 inch panels. Also prepare two sets of six panels
divided into three groups of two panels each of SAE 1010, 1 x 2.5 x 0.026 inch panels.
Additionally, prepare one set of six panels divided into three groups of two panels each of
SAE 1010, 3 x 6 x 0.020 inch panels. All of these panels are to be prepared in accordance
with the following schedule:
(a) For the length of time and the temperature normally recommended by the finish
manufacturer. (All tests).
(b) For the same length of time but at a temperature of 25 degrees Fahrenheit lower
than (a) above. (All tests).
(c) For the same length of time but at a temperature 25 degrees Fahrenheit higher
than (a) above. (All tests).
4.3.2 Film thickness. The types I and III coatings shall be applied by spray in such a
manner that the film thickness after baking shall be 0.0005± 0.0001 inch. Type II coatings
shall be applied by spray in such a manner that the film thickness after baking shall be
0.0005± 0.0001 inch for clear coatings and 0.00125± 0.00025 inch for pigmented films. The
panels shall be coated in an atmosphere as free as possible from dirt, dust or laboratory
fumes.
4.3.3 Absence of film defects. Two test panels, 3 x 6 x 0.026 inches in size, prepared as
specified in 4.3.1, shall be spray coated to a dry film thickness of 0.0005± 0.0001 inch for
types I and types III materials. The thickness of type II coatings shall be in accordance with
4.3.2. The panels shall be prebaked at 212o ± 5o F for 20 minutes and then baked according
to the manufacturer's recommended baking schedule. The panels shall be examined visually
for defects specified in 3.5
4.3.4 Film adhesion and flexibility. Test panels, 3 x 6 x 0.020 inches in size, shall be
prepared and coated as specified in 4.3.1 and 4.3.2. A minimum of two coated panels for
each of the three schedules specified in 4.3.1 shall be tested for film adhesion and flexibility
by rapidly bending each coated panel around a mandrel 0.5± 0.01 inch in diameter for type I
material, 1.00± 0.01 inch in diameter for type II material and 0.125± 0.005 inch in diameter
for type III material. The film shall be examined for compliance with 3.6. A strip of
transparent, pressure-sensitive, adhesive cellophane tape conforming to A-A-113 shall then
be pressed down on the bend in the coated panel and stripped off. None of the phenolic
coating shall be lifted off by the adhesive tape.
4.3.5 Solid content. Weigh to the nearest milligram a small disposable aluminum dish
approximately 2 inches in diameter. Weigh into the dish a very small sample of the varnish
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