MIL-PRF-47033B
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. First article inspection (see 4.2).
b. Quality conformance inspection (see 4.3).
4.2 First article inspection. A first article sample shall be prepared using the same
methods proposed for the preparation of subsequent lots of material. First article
inspections shall be conducted on the frost article sample and shall consist of all the
examinations and tests specified herein. Samples which do not meet all the requirements
of this specification shall be rejected. Subsequent quantities will not be considered for
acceptance until approval of the first article sample has been obtained.
4.3 Conformance inspection. Conformance inspection shall include all
examinations and tests of 4.4
4.4 Test methods. Test methods shall be as specified in `ASTM E 438, and herein.
4.4.1 Modulus of elasticity. Compliance with the modulus of elasticity specified in
3.3.1 shall be verified in accordance with ASTM C 623 or other equivalent, correlated test
method approved by the procuring activity.
4.4.2 Inclusions. Compliance with the inclusion limits specified in 3.3.2 shall be
verified using a test set-up similar to figure 1, or other test method approved by the
procuring activity. Using the set-up in figure 1, illuminate the sample from the side and
view the sample normal to the black background. Inclusions appear as bright specks on a
dark field. The sample may require immersion in a refractive index matched cell if the
surfaces are not sufficiently polished.
Figure 1. Inclusions inspection set-up.
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