R. Meyer J. Köhler A. Homburg Explosives

Vacuum Test
Vacuum Test
This test, which was developed in the USA and has been adopted by
several countries, and is a modification of the W Taliani Test, in which
the gaseous products of the reaction are determined volumetrically
rather than by manometry. The test, which is carried out at 100 °C
(212 °F) for single base propellants and at 90 °C (194 °F) for multibase
propellants, is terminated after 40 hours, unlike the Taliani Test,
which is interrupted after a given pressure or a given volume has been
attained.
The vacuum test is used for compatibility testing and applied as a
so-called reactivity test. The compatibility between the explosive and
the contact material (adhesive, varnish, etc.) is tested by determining
the gases liberated by the explosive alone, by the contact material
alone, and by the two together. The measure of compatibility (reactivity)
is the difference between the sum of the gas volume liberated
by each component separately and the gas volume obtained after
storing the explosive and the contact material together. If this difference
is below 3 ml, the compatibility is considered to be “stable”,
between 3 and 5 ml, the compatibility is considered „uncertain“; above
5 ml, the two materials are incompatible.
Versuchsstrecke
Berggewerkschaftliche Versuchsstrecke
D-44239 Dortmund-Derne
German institute for research and testing of equiptments and materials
for use in gassy coal mines (including W Permitted Explosives,
W Bridgewire Detonators and W Blasting Machines).
Vibrometer
362
Erschütterungs-Messgerät
Vibrometers are instruments to measure the intensity of shock waves
caused by blasting operations. The magnitude of the shock depends
on the kind of rocks, underground conditions and distance to the
people and buildings to be protected. The regular control of ground
shocks caused by blasting is therefore, in the interest of companies
active in this field to safeguard friends relations with the neighborhood.
Vibrometer records, can also be important in forensic defense against
claims in densely populated areas.
The following vibrometers are developed, produced and distributed by
WASAGCHEMIE Sythen, Haltern, Federal Republic of Germany:
Explosives. Sixth Edition. Rudolf Meyer, Josef Köhler, Axel Homburg
Copyright © 2007 Wiley-VCH & Co. KGaA, Weinheim
ISBN: 978-3-527-31656-4