Jacque stability test

Jacque Stability Test. Jacque, director of the Spanish plant Cantabrica at Guldacano, near Bilbao, proposed a test for NC which was simple, rapid, and did not require complicated apparatus. It is not advisable to use this test when it is known in advance that the NC is of low stability Procedure. A NC sample of 2-3g, previously-dried in a loosely covered weighing dish or crystallizer to constant wt, is transferred to an oven maintained at 130—40° and left there for 2 hrs. It is cooled in a vacuum desiccator and reweighed. The sample is again heated at 140° and weighed at intervals of 2 hrs until it decomposes, as indicated by an abnormal loss of wt. After termination of the test, it is advisable to wash the NC with distilled water, add a few drops of 0. IN KMn04 soln and determine the amt of HN03, either by the nitron or diphenylamine method... 

Jacque Stability Test. Jacque, director of the Spanish plant Cantabrica at Guldacano, near Bilbao, proposed a test for NC which was simple, rapid, and did not require complicated apparatus. It is not advisable to use this test when it is known in advance that the NC is of low stability... 

Berkhout Stability Test, designed in the artillery laboratory at Hembrug,Holland, consists in heating samples of NC or propints in weighing bottles at 95°, 105° or 110° and noting the loss of wt in a definite period(such as 72 hrs), as well as the time required for evoln of red fumes. The heating is conducted in a specially designed thermostatically controlled oven. Two models of such ovens are described in Ref 1 (Compare with Jacque Test and with Sy Test) Refs 1)J.D.Berkhout,SS 17,33 4(1922) CA 16, 2602(1922) 2)Reilly(1938),85... 

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