MIL-PRF-4556F
for the specified time. Check the drying time in accordance with ASTM D1640 and
evaluate for compliance with table I.
4.3.10
Condition in container.
4.3.10.1 Component A. For the primer and the topcoat, determine package
condition of component A in accordance with FED-STD-141, method 3011 and observe
for compliance with 3.6.1.1. Determine pigment settled by proceeding as specified
in FED-STD-141, method 3011, but do not stir. Reseal and then agitate the cans
for 3 minutes on a paint shaker3. On reexamination of the contents, the
disclosure of any gel bodies or undispersed pigment indicates unsatisfactory
settling properties.
4.3.10.2 Component B. For the primer and the topcoat, determine package
condition of component B in accordance with FED-STD-141, method 4261 and observe
for compliance with 3.6.1.2.
4.3.11
Storage stability.
4.3.11.1 Component A. Allow full quart cans of component A, primer and topcoat,
to stand undisturbed for 12 months at 21 to 32oC (70 to 90oF) and then examine the
contents. Evaluate the pigment settling as specified in 4.3.10.1 except agitate
the can for 5 minutes on the paint shaker prior to reexamination. Determine
viscosity and other applicable tests for compliance with 3.6.2.1.
4.3.11.2 Component B. Allow full quart cans of component B, primer and topcoat,
to stand undisturbed for 12 months at 21 to 32oC (70 to 90oF). At the end of this
period, examine the contents in accordance with FED-STD-141, method 4261 for
compliance with 3.6.2.2.
4.3.12 Mixing properties. Thoroughly mix 4 parts, by volume, of each component A
with one part, by volume, of the appropriate component B. Place 150 ml of each
mixed material in separate glass jars. Do not agitate or disturb for 4 hours. At
the end of this period, examine with a spatula for compliance with 3.6.3.
4.3.13 Spraying properties. Mix the components of the primer and the topcoat as
specified in 4.3.7 and spray each separately on steel panels to dry film thickness
of 0.003 to 0.004 inches according to FED-STD-141, method 4331. Allow to air dry
for 24 hours and observe for compliance with 3.6.4.
4.3.14 Brushing properties. Mix the components of the primer and the topcoat as
specified in 4.3.7 and brush each separately on metal panels according to FED-STD-141,
method 4321. Allow to air dry for 24 hours and observe for compliance with 3.6.5.
4.3.15 Knife test. Panels used for this test shall be solvent cleaned and sand
blasted with fresh sand to a smooth uniform appearance in accordance with SSPC-SP5.
Spray the primer, mixed as specified in 4.3.7, on two 3 by 6 inch steel panels (sand
blasted side), to a dry film thickness of 0.003 to 0.004 inches. Air dry the panels
for 24 hours and spray them with the topcoat, mixed as specified in 4.3.7 to a dry
film thickness of 0.003 to 0.004 inches. Total film thickness of the panels should
be 0.006 to 0.008 inches. Air dry the panels for 7 days and perform the knife test
according to FED-STD-141, method 6304 and observe for compliance with 3.6.6.
4.3.16 Pot life. Mix the components of the primer and topcoat as specified in 4.3.7
and allow each to stand undisturbed for 4 hours. Measure viscosity according to
ASTM D562 and evaluate for compliance with 3.6.7.
3
An apparatus of this type, powered by a 1/4 HP motor, operates at a rate of 1350
shakes per minute and is manufactured by Red Devil Tools, Irvington, NJ.
9
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