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The three methods commonly employed for oxygen-absorption studies—namely, gravimetric, manometric, and volumetric—are briefly reviewed and compared. Illustrative examples of the use of the volumetric method for the study of aging are presented.
The limitations of the method are said to be no more numerous or serious than those of other aging tests. The data are shown to be reproducible and to correlate with changes in physical properties. It is recommended, however, that the data be used in conjunction with other aging tests and not as the only criteria of aging resistance.
Oxygen absorption methods offer great promise for continued use in the study of aging and also for possible use as a test for predicting the probable relative resistance to aging in storage and in service. The need for further study to establish more precisely the degree of utility and the limitations of the method for such purposes is recognized.
Reid Shelton, J.
Professor of Organic Chemistry, Case Institute of Technology, Cleveland, Ohio