ASTM C224-78(R2020) pdf free download

ASTM C224-78(R2020) pdf free download.Standard Practice for Sampling Glass Containers
5. Procedure
5.1 Continuous Process—Sampling from a continuous manufacturing process shall be in accordance with a time schedule. For those characteristics affected by the degree of annealing, take the samples from the exit of the lehr (or from packed cases whose continuity in point of time is known). For those characteristics not affected by the degree of annealing, quickly cooled samples may be taken ahead of the lehr. 5.2 Lot—Select the sample from a lot by a procedure consistent with the purpose of the sample. For some purposes, the sample may come from the lot as a whole; for other purposes, it may be necessary to sort the lot before sampling. Such sorting may be for the purpose of segregating lots based on style, color, size, manufacturer, or mold designation, as examples. Take the specimens composing the sample accord- ing to the principles of random sampling; for instance, do not take all the specimens from the same side or location ofthe lot. Ifthe containers are packed in cases, remove the cases from the lot at random. Take specimens for evaluation, in turn, at random from these cases. The minimum number of cases to be selected shall be determined in accordance with MIL-STD- 105E (see 5.2.1) or that number required to provide the number of individual containers to be evaluated (see 5.2.2), whichever quantity represents the larger number ofcases. Ifmore than one independent evaluation can be performed on the same container, no additional sample is required for the multiple evaluation. 5.2.1 Minimum Number of Cases Determined in Accor- dance With MIL-STD—Determine the number of cases in the lot and use this number as “lot size” for Table 1 of MIL-STD- 105E. Find the corresponding sample size code letter (normally Column II) of Table 1. Using the first and second columns of Table II-A, find the sample size corresponding to this code letter. This sample size will designate the number ofcases to be selected at random from the lot. As far as possible, an equal number of individual containers shall be taken for evaluation from each case selected. 5.2.2 Minimum Number ofCases Determined by Number of Individual Containers to Be Evaluated—In the event that 5.2.1 does not provide the number of containers required for the evaluation, select sufficient cases at random to provide the necessary number of containers. N OTE 1—An example of minimum sampling using MIL-STD-105E is as follows: A lot of 1000 cases of 24 containers each would call for sample size code letter J (Column II, Table 1), corresponding to 80 cases (Table II-A). The minimum sample size for visible characteristic determinations for the original lot of 24 000 containers is designated by sample size code letter M. Turning to Table X-M-2, it can be seen that 315 containers (approxi- mately 4 per case selected) are needed for a single sample, 200 (2 1 ⁄ 2 per case) followed by 200 (2 1 ⁄ 2 per case) for the respective first and second samples for double sampling, and 80 (1 per case) for each step ofmultiple sampling. The containers sampled may be used to determine the relative frequency of occurrence of containers from individual mold cavities. Containers that have passed the visual examination may be used to provide samples (chosen at random from among the cases) for the annealing, internal pressure, thermal shock, and dimensional evaluations as required.
6. Report
6.1 Report the following information: 6.1.1 Style, size, color, and manufacturer of the lot evaluated, 6.1.2 For continuous production sampling, the place of manufacture, the time of sampling, the individual mold desig- nation (if pertinent), 6.1.3 For lot sampling, the shipment identification, or ware- house location, as pertinent, 6.1.4 Sample size, and the number of cases sampled (if from lots in cases), 6.1.5 Method of taking the specimens, and 6.1.6 Results of the evaluation or the disposition of the lot on the basis of the sample taken.