MIL-DTL-8971F
4.5 Conformance inspections. Conformance inspections are inspections of production
products for delivery. Unless otherwise specified in the contract or purchase order, conformance
inspection samples from each production lot shall be subject to the inspections shown in table IV
in accordance with the procedures in 4.6. A production lot is defined as an indefinite quantity of
electrodes, which were manufactured at the same location, from the same mix of graphite
material, and in accordance with the same manufacturing processes and procedures, and which
were subjected to the manufacturer's purification process at the same time. The manufacturer
shall mark lots of electrodes with a single unique lot identifier, which is traceable back to a single
mix of raw graphite material. For groups I and II inspections (see table IV), samples of sufficient
size to be statistically relevant shall be selected in accordance with ASQ Z1.4 for general
inspection level I. For group III inspections, a random sample of 500 disk electrodes and 50 rod
electrodes shall be selected for testing. When practical, the inspections shall be performed in the
order shown in table IV. Units passing group I inspections may be reused in groups II and III
inspections, provided they have not been contaminated. Groups II and III inspections are each
considered destructive testing and the units tested on either test shall not be reused.
TABLE IV. Conformance inspections.
Requirement
Inspection
Inspections
paragraph
paragraph
Group I:
Material, workmanship, cleanliness,
4.6.1 &
dimensions, and mass
Group II: Impurities
Group III: Accuracy and repeatability
4.5.1 Rejected lots. If an inspection lot is rejected for a feature that may be corrected or
screened, the manufacturer may rework the lot to correct the defects or screen the lot to remove
the defective units and resubmit the lot for reinspection. Such lots shall be separate from new
lots and shall be clearly identified as reinspection lots. New electrode samples shall not be
submitted until the manufacturing defects have been resolved.
4.5.2 Disposition of inspection samples. Product samples that have been subjected to
conformance inspection shall not be delivered on contract or order.
4.6 Methods of inspection.
4.6.1 Examinations. Manufacturer's records and sample electrodes shall be carefully
examined to determine compliance with the specification requirements for materials, dimensions,
workmanship, and cleanliness.
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