This is an approximation of the amount of friction or rubbing a compound can withstand before prematurely exploding. For instance, Nitroglycerin has an extremely high sensitivity to friction, meaning that very little rubbing against it could set off a violent explosion
--208.189.213.46 22:44, 30 August 2005 (UTC)Matt Day
The orifice diameter is decreased from 20 mm until the increased confinement causes the reaction to burst the tube.
The critical diameter is determined as the largest diameter for which an explosion is observed and is used as the criterion for classifying a material as "thermally sensitive." The test is used to assess the sensitivity of the test material to the effect of intense heat under confinement.
The test is used to assess the sensitivity of a substance under confinement in a steel tube to detonative shock.
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