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1916-2016

The Effect of the Continued Action on Chemical Glassware of Water, Acid and Alkali

The Effect of the Continued Action on Chemical Glassware of Water, Acid and Alkali

T235-T239 (5 pages)

In testing the resistant power of glass surfaces to chemical agents, it is customary to select for test a flask or beaker, and, after removing any surface deposit by thorough cleansing, to determine the action of the reagent. The test is in many cases carried out but once on each flask, although it may be repeated two or three times with different vessels. Occasionally, the test may be repeated two or three times in succession on  the same flask. This was the method adopted by us as described in a previous paper for we were doubtful whether or not the surface of the glass for the first test could be considered in its normal condition. The results of the three successive tests were not always in close agreement, and in several instances the flasks were therefore compared on the basis of the total attack during the, three periods. No regularity was in any case established between the values obtained in the three successive tests. Sometimes the numbers remained practically constant; in other instances there might be progressive increase or decrease.

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