MIL-DTL-43719D
4.6.9.2 Low temperature (class 1, type II only). Strips of premasked marking material 2-1/2 by 8
inches shall be applied to 3 by 10 inch bare and coated test panels, such that 2-1/2 inches by 6 inches of the
marking material is adhered to the panel. Test panels and marking materials shall be conditioned for 2 hours at
34° F ± 2° F and the applications and tests shall be made at that temperature. Application shall be
accomplished with firm pressure of a plastic, hand squeegee as recommended by the manufacturer. Test
panels shall be dry at time of application. Following application, the translucent transfer sheet shall be
removed, the sample resqueegeed, and the unapplied 2 inches of marking material folded back on its adhesive
to form a 1 inch long tab. The tab shall be grasped immediately and used to peel the sample back on itself
(180°) from the test panel. If the material breaks or tears during removal, it shall be considered to have
satisfactory low temperature initial adhesion. Removal of the entire sample without breakage or tearing
constitutes failure.
4.6.10
Screenability test. Marking material shall be cut to a size to permit screen process coverage
of ½ square foot or more. An opaque, flexible, durable vinyl screen printing ink shall be applied in accordance
with commercial practice and thoroughly dried. When thoroughly dry, the screened specimen shall be
examined for streaking, bleeding, or other sign of incompatibility. A 2 inch by 5 inch strip of the processed
material shall be applied to a bare metal test panel and conditioned. The panel shall then be tested in
accordance with method 6301 of FED-STD-141 and examined for damage, such as the removal of ink from
marking material. The interval from time of removal of panels from the water to time of application of the tape
shall be 60 ± 5 seconds. Stripping of the tape from the panel shall be done immediately after tape application.
The screenability shall be reported as unsatisfactory if above appearance defects and loss of adhesion occur.
4.6.11
Printability (class 2 material). Class 2 marking material shall be applied to one bare and one
coated panel as specified in 4.5.2. Five capital letters, ¾ inch high, shall then be stenciled on the material,
using stencil-board conforming to any type or grade of A-A-1733. Forty seconds after application of the ink, the
lettering shall be tested for set-to-touch by lightly touching with the fingers. The lettering shall then be visually
examined from a distance of 6 feet for sharpness and legibility.
4.6.12
Water resistance. The marking material shall be applied to one bare and one coated panel as
specified in 4.5.2. Force dry the applied panels at 150° F ± 2° F for two hours. Cool to standard conditions
(4.5.1). immerse half of panel in distilled water for eight hours at 73° F ± 2° F. The materials shall be removed
from the water and examined five minutes after removal and 24 hours after removal.
4.6.13
Fuel resistance (class 1 only). Marking material shall be applied to one bare and one coated
panel as specified in 4.5.2, and the edges sealed with clear sealer as recommended by the manufacturer.
Sealer shall dry thoroughly during the conditioning period. Immerse half of panel in hydrocarbon test fluid
conforming to MIL-PRF-680 for 1 hour. The marking material shall be examined 24 hours after removal from
the test fluid.
4.6.14
Corrosion resistance. One bare metal panel each of aluminum alloys 5052 and 6061
conforming to ASTM B209 and of stainless steel with composition of S30400 conforming to ASTM
A204/A204M, shall be prepared in accordance with ASTM D1730 marking material shall be applied to panels
as specified in 4.5.2.1 and the panels heated to 150° F ± 2° F for 168 hours. The material shall then be tested
for the presence of acid, using moistened blue litmus paper applied to the body and edges of the film. The
material shall be removed from the panels and the metal shall be examined for evidence of corrosion.
Weather resistance.
4.6.15
Class 1. Class 1 marking material shall be applied to two bare and two coated panels as
4.6.15.1
specified in 4.5.2, and shall be mounted and exposed in a 45° facing south position in accordance with ASTM
D1014 for 12 months in the Miami, Florida area. After 4 months of exposure, one panel of each type shall be
tested for quality of removability of the marking material in accordance with requirement of 3.7.12.1.
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