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|  MIL-C-21067C (MI)
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first
article inspection (see 6.3) in accordance with 4.4.
3.2 Material. The coating material shall be a polymerized chloroprene
compound dispersed in a solvent suitable for application by brush to either horizontal
or vertical steel surfaces. A primer shall be used as part of the coating system to
obtain the required adhesion (see 3.3).
3.3 Physical properties.
3.3.1 Viscosity. The viscosity of the coating compound shall be in accordance
with 4.6.1 and shall be not greater than 25% of the first article viscosity value.
3.3.2 Solids. The solids content of the coating compound shall be in
accordance with 4.6.2 and shall be not less than 25% of the total. It also shall be not
greater than 10% of that of the first article (see 4.4).
3.3.3 Tensile strength. The tensile strength of the coating compound shall be
in accordance with 4.6.3 and shall be not less than 600 pounds per square inch (psi).
3.3.4 Ultimate elongation. The ultimate elongation of the coating compound
shall be in accordance with 4.6.3 and shall be not less than 250%.
3.3.5 Initial adhesion. The initial adhesion of the coating compound shall be in
accordance with 4.6.4.2 and shall be not greater than 3 inches when subjected to
stripping for 3 minutes with a 10 pound (lb). load.
3.3.6 Adhesion after aging. The adhesion after oven aging shall be in
accordance with 4.6.4.3 and shall be not greater than 3 inches when subjected to
stripping for 3 minutes with an 8 lb. load.
3.3.7 Adhesion after water immersion. The adhesion after water immersion
shall be in accordance with 4.6.4.4 and shall be not greater than 3 inches when
subjected to stripping for 3 minutes with a 10 lb. load.
3.3.8 Color. Unless otherwise specified in the contract or order (see 6.2), the
coating material shall be of a gray color conforming to formulate 20 of DOD-E-699D
(see 4.6.4.5).
3.4 Workmanship. The coating shall be produced in a manner to insure a
product which shall be uniform, in conformance with this specification, and free of
dirt, foreign material or other contaminants (see 4.7).
3
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