MIL-DTL-43719D
4.6.3 Thickness. One strip of marking material, approximately 1 by 6 inches shall be cut from each
sample. The liner shall be removed, the marking material applied to strips of aluminum foil approximately 0.001
inch thick, and firmly rolled down. The average thickness of the aluminum foil shall have been previously
measured by micrometer to the nearest 0.0001 inch. Four micrometer readings shall be taken at random
locations on the strip. Calculate the average thickness to the nearest 0.0001 inch after allowing for the
thickness of the aluminum foil.
4.6.4 Breaking strength. Five strips of marking material, each 1 by 6 inches shall be cut from the
sample and conditioned in accordance with 4.5.1. After removing liners and any transfer sheets, test in
accordance with ASTM D2370 except that head travel rate shall be 12 inches per minute and the results shall
be reported in pounds per inch of width. Calculate the average breaking strength of the five specimens.
4.6.5 Elongation. Specimens prepared and tested as specified in 4.6.4 shall be simultaneously tested
for elongation in accordance with ASTM D2370.
4.6.6 Shrinkage. Two 6-1/2 inch squares of marking material shall be applied to cover the surface
of two 6 by 6 inch bare metal panels (see 4.5.2.1). The marking material shall then be trimmed to the
dimension of the panel. Type I and II materials shall be trimmed prior to removal of translucent transfer sheet
and rerolled or resqueegeed following transfer sheet removal, as specified in 4.5.3. The panels shall be baked
at 150° F for 48 hours and allowed to cool, after which the amount of shrinkage of the 6 inch dimensions shall
be measured.
4.6.7 Free film flammability. One strip, 1 by 12-1/2 inches, shall be cut from the marking material.
The specimen shall be tested in accordance with ASTM D568.
4.6.8
Flexibility.
4.6.8.1 Room temperature. At standard conditions, a 1 by 2 inch portion of the marking material,
with liner removed and the adhesive covered with talc to prevent sticking, shall be folded forward and backward
on itself 20 times with pressure of the thumb and forefinger being exerted on the creased section each time the
material is folded. After 20 folds, the creased section shall be observed for cracking, breaking, or delamination.
4.6.8.2 Low temperature. Marking materials shall be applied to a bare metal panel as specified in 4.5.2.1,
Which shall then be mounted film side up on a steel plate 9 by 9 inches by 1 inch thick. The assembly shall be
maintained in a conditioning chamber for 5 ±1/4 hours at (minus 20 ±2F). The assembly shall be firmly
supported in a horizontal plane and, at the same temperature, the test specimen shall be subjected to the
action of a 5 pound steel ball dropped once from a height of 24 inches. The test specimen shall be brought to
room temperature and examined for cracking of the face surface.
4.6.9
Adhesion.
4.6.9.1 At room temperature, class 1 (all types), and class 2 (types I and II). Five strips of marking
material, each 1 by 8 inches, shall be applied separately over 2 by 4 inch bare and coated aluminum panels
(with one end of the strip flush to one end of the panel) so that a 1 by 3 inch area of the panel shall be adhered
to the marking material. The free end of the material shall be doubled back at 180°. The applied strips shall be
allowed to set for 24 hours prior to testing for adhesion. The bare end of the aluminum panel shall be clamped
in the lower jaw of the tensile testing machine and the free end of the material shall be clamped in the upper
jaw. Adhesion shall be determined on a dead-weight pendulum or crosshead type testing machine. The film
shall be pulled back from the test panel at a constant rate of head travel of 12 ± 0.5 inches per minute. After
the first inch is removed, the average tension required to remove the next inch shall be determined. If class 1
material breaks or tears at any point during removal, the test shall be terminated and the material shall be
considered satisfactory if the value is equal to or higher than, and unsatisfactory if lower than, the applicable
value specified in 3.7.6.
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