R. Meyer J. Köhler A. Homburg Explosives

Cap Sensitivity
portation has placed W Blasting Agents into a hazard category subject
to regulations similar to those applicable to the former N.C.N. classification,
i.e. much reduced in stringency. Explosives classified as blasting
agents are those which can not be initiated by means of an
explosive cap.
In Germany the following test for sensitivity to explosive caps has been
developed:
Fig. 7. Cap test (dimensions in mm)
The explosive is placed into a cardboard tube, 200 mm long, inside
diameter of 80 mm, wall thickness between 1.3 and 1.4 mm. One end
of the tube is sealed by a thin cardboard disk, which is glued into
position. The density of the filling charge is determined by weighing
(increase in weight after filling volume 1005 cm 3 ). The cap sensitivity
can be influenced by the density of the charge. The test sample is
placed upright onto a steel plate of 1 mm thickness, which is placed on
a steel ring 50 mm in height, inside diameter of 100 mm, and wall
thickness of 3.5 mm. A European test fuse (0.6 g PETN secondary
charge) is inserted from the top throughout the full length of the tube,
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