MIL-R-83248C
4.4 Qualification tests. Qualification testing shall be conducted every 3 years as a minimum. The preparing activity determines which tests should be performed for requalification.
4.4.1 Tests. Initial qualification tests shall consist of all the tests specified in 3.2 when tested in accordance with 4.6.
4.4.2 Samples. Test samples for type I material shall consist of 50 size -214 o-rings conforming to MIL-R-8324811 or MIL-R-8324812 from one production lot. Eight 1-inch nominal diameter by 1/4-inch minimum thickness hardness buttons made from the same formulation material as the o-rings shall also be supplied. For type II materials, ten 6-inches by 6-inches by 0.075-inch platen sheets shall be supplied.
4.5 Quality conformance inspection.
4.5.1 Quality conformance inspection testing. Quality conformance tests shall be required for all production lots of material. These tests may be performed by the manufacturer's laboratory or at an independent laboratory.
4.5.1.1 Lot. A lot shall consist of all material of the same identity cured in the same production run, from the same batch, and submitted at the same time for inspection.
4.5.1.2 Batch. A batch shall be the quantity of material compounded on a mill or mixer at one time.
4.5.1.3 Sampling. Except where otherwise indicated herein, sampling for quality conformance shall be in accordance with the specified zero defect sampling plans. One or more defects found in the sample shall be cause for the rejection of the lot.
4.5.1.4 Inspection of material and components. The supplier is responsible for ensuring that materials and components used were manufactured, tested, and inspected in accordance with referenced subsidiary specifications and standards to the extent specified, or if none, in accordance with this specification (see 4.1). In the event of conflict, this specification shall govern. Inspection records shall be kept complete and available to the procuring activity at all times.
4.5.2 Sampling plan A. Whenever possible, the end item, or specimens cut from the end item, shall be used as the sample. If these items are unsuitable for use as test samples, tests shall be performed on samples of identical composition and state of cure as that of the end item. The type I o-ring sizes that are suitable for test are shown in table VI. For all other sizes, the tests on type I materials shall be conducted on size -214 o-rings. If the type II items are unsuitable for test, the samples shall be cut from 6 inches by 6 inches by 0.075 inch platen sheets. If at all possible, compression set and specific gravity tests shall be conducted on the end item. The samples shall be subjected to the following tests that are conducted on each lot of material:
Original (Table VIII) Air aged 22 hours @ 392oF ± 5oF (4.6.5)
Tensile strength Compression set
Elongation
Hardness
Specific gravity
10
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