A Pressure Bar Test Free of Asbestos for Determination of Detonator Performance
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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The Pressure Bar equipment for testing detonators was developed from the Hopkinson Pressure Bar. Detonators were tested at Materials Research Laboratory MRL till 1969 on the Pressure Bar using an asbestos-magnesium carbonate degrading and protection pellet to transmit the detonation wave from the detonator to the pressure bar. In 1969, the use of asbestos was banned at MRL for health reasons. It thus became necessary to find an alternative test material and to suitably modify the Pressure Bar equipment to accept this alternative. This report details the search for such a material and the establishment of modified Pressure Bar equipment. Data for a wide range of Service and commercial detonators are described.
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