MIL-STD-869D
5.2.2.1 Test for Bond Tensile Strength. From the same material as the production item was made; make the two (2) specimens shown in Figure 1. Drill and tap on one (1) end of each specimen approximately 1.2 inches deep and thread 3.8 inches, either 16 to 24 threads per inch. The tapped hole must be centered and parallel with the specimen axis; flat-faced ends must be surface ground perpendicular to the axis. Blast the flat-face and evenly apply 0.010 inch or more of the coating material to one specimen (See Figure 1). After surface grinding or handsanding the coated
specimen flat within two (2) mils, cement the coated specimen to the plain specimen with epoxy adhesive and oven cure. Assemble the treaded pull rods and pull the specimens apart on an accurate tension tester. The minimum strength standard shall be
established by the applicable engineering department for each application.
5.2.2.2 Hardness Test. The hardness test is performed on a Rockwell hardness tester using the A, B, or D scales. The prepared test samples (2" x 3" x .005") must have the following minimum coating thickness:
a. A Scale - 0.030 inch b. B Scale - 0.050 inch c. D Scale - 0.045 inch
Coating should have at least 100 micro-inch finishes when using the Rockwell A, B, or D scales. Hardness values of the coating materials shall be specified by applicable engineering department.
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