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|  MIL-R-48233A(MI)
4.4.2 Thermal shock test (see 4.3.3.2). Each of the twenty-five
(25) stabilizing rods shall be placed on wood supports in an air
bath test chamber at -65F 2F, for not less than 6 hours.
Within one minute after removal of stabilizing rods from the low
temperature air bath test chamber, the stabilizing rods shall be
placed in an air bath test chamber at +165F, 2F, for not less
than 6 hours. This cycle shall be repeated once again without
interruption.
4.4.3 Concentricity test (see 4.3.3.3). Each of the ten (10) test
samples shall be tested for concentricity, using an approved gage.
4.4.4 Adhesion Test (see 4.3.3.4). The adhesion test shall be
performed on samples passing the thermal shock test as follows:
4.4.4.1 Preparation of specimens, Three (3) test specimens, one from
each end and one from the middle, shall be cut from each of the ten
stabilizing rods. Each specimen shall be three inches in length and
shall have one-half inch of coating removed from each end, leaving
a test specimen of 2 inches 1/16 inches. The end faces of the
coating on the test specimen-shall be free of coating material and
burrs,
4.4.4.2 Conditioning of specimens. Prior to testing, the specimens
shall be conditioned at a temperature of +70F, 5F, for not less
than two hours.
4.4.4.3 Test equipment. The test equipment for the adhesion test
shall be any testing machine having a moveable head whose speed can
be adjusted to 2 inches + 0.250 inches per minute when the machine
is running idle. The load indicating mechanism shall be capable of
accurately indicating load readings to within + 3 pounds. The jig
for applying the load to the stabilizing rod test specimen shall
be such that the load is applied through surfaces that are flat and
parallel to the ends of the stabilizing rod specimens, normal to the
long axis of the specimen, so as to shear the chemical coating from
the rod. The entire surface area of the coating should be in contact
with the test fixture applying the load.
4.4.4.4 Test procedure. Each stabilizing rod specimen shall be
tested with the test machine crosshead speed set at 2 inches 0.250
inches per minute. The maximum load carried by the stabilizing rod
specimen at time of failure shall be recorded.
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