ZZ-R-768B
TABLE II. Sampling for examination.
Number of Components in Lot |
Number of Components in Sample |
Major Defects |
Acceptance Number |
||
40 and under |
10 |
0 |
41 to 110 |
15 |
0 |
111 to 300 |
25 |
1 |
301 to 500 |
35 |
1 |
501 to 800 |
50 |
2 |
801 to 1300 |
75 |
3 |
1,301 and over |
110 |
4 |
4.4.1.3.1 Major defect defined. A major defect is a defect that is likely to result in failure or to reduce materially the usability of the resilient components for its intended purpose.
4.4.1.4 Sampling for tests. For the tests specified in 4.5, the contractor shall furnish three cured sample pieces 6 inches long by 6 inches wide by 0.080±0.010 inch thick and one cured sample piece at least 6 inches long by 6 inches wide by 0.500±0.010 inch thick, to represent each lot of either uncured compound or resilient components. The sample pieces shall be certified by the supplier to be identical in composition and prepared at the same time from material used in the lot offered for delivery.
4.4.2 Quality conformance examination and tests.
4.4.2.1 Examination. Each of the samples taken in accordance with 4.4.1.3 shall be subjected to examination for workmanship, dimensions, and tolerances. MIL-STD-407 shall be used to determine and evaluate defects.
4.4.2.1.1 Rejection. Any component in the sample containing one or more defects shall not be offered for delivery. If the number of defective components in any sample exceeds the acceptance number for that sample, this shall be cause for rejection of the lot represented by the sample.
4.4.2.2 Tests. The samples submitted in accordance with 4.4.1.4 shall be subjected to the conformance tests specified in table I.
4.4.2.2.1 Action in case of nonconformance. If any of the samples representing a lot is found to be not in conformance with the requirements of this specification, this shall be cause for rejection of the lot it represents.
4.5 Test methods.
4.5.1 Tensile properties. Tensile strength, ultimate elongation, and tensile stress (modulus) at 100 percent elongation shall be determined in accordance with ASTM D412, Test Method A. Die C specimens shall be used for all determinations of tensile properties.
4.5.2 Hardness. Hardness shall be determined by ASTM D2240, Type A durometer. The three-second reading shall be taken on a 0.500±0.010 inch thick specimen.
4.5.3 Specific gravity. Specific gravity shall be determined in accordance with ASTM D792.
4.5.4 Tear resistance. Tear resistance shall be determined by ASTM D624 using Die C specimens that are
0.800±0.010 inch thick.
4.5.5 Tensile properties after oven aging. Tensile strength, ultimate elongation, and tensile stress (modulus) at
100 percent elongation after oven aging shall be determined in accordance with ASTM D573. The aging period shall be 96±½ hour at 194±2 °F (90±1.1 °C). Determination shall be made not less than 20 hours or more than 48 hours after removal from the oven.
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