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Minimum property values are test results which indicate the lowest expected result within a designated accuracy for a definite property of a specific material. Test methods to determine minimum property values are basic requirements for design purposes and for anticipating service performance. Many tests are available to control properties of proven materials, but few methods allow prediction of suitability of materials before trial. The papers of this symposium are intended primarily to present the background of a few attempts to correlate general material test methods with expected service and design requirements. They are planned to set a base line for further work to be sponsored by Subcommittee XI on Nomenclature, Significance, and Statistics of ASTM Committee D-9 on Electrical Insulating Materials—these covering the general field, while future discussions will delve deeper into specific properties or material types. The cooperation and assistance of those having interest or data on any phase of the subject is greatly desired. A few of the papers present substantiated methods for filling a small portion of the void in performance-evaluating test methods, a lack that is commented on below. In general, we are attempting only to point out the need, and to offer some suggested remedies for consideration and possible further work. It must be emphasized that very limited data have been obtained on some of the tests introduced, and confirming evaluation is required before these can be put to general use.
Craig, C. L.
Senior Materials Engineer, Sperry Gyroscope Co., Great Neck, N. Y.