A Study of the Feasibility of Developing a Low Sensitivity CC (Conducting Composition) Cap for Raufoss 20 mm Ammunition,
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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The possibility of developing a conducting composition CC cap which meets the performance specifications of the M52A3B1 CC cap yet possesses significantly decreased sensitivity to initiation has been examined. Two-component mixes consisting of a primary explosive and a conducting component were investigated. Five materials were assessed as alternatives to normal lead styphnate RD1303 but all were found to be unsatisfactory either through excessively high sensitivity to energy delivered by capacitor discharge or excessively long functioning times. RD1303 of smaller crystal size than the normal production type also leads to undesirable sensitivity increases. Five graphitescarbon blacks were assessed in admixture with RD1303. Merck synthetic graphite and Tintacarb 90 and 140, which combine properties of both carbon blacks and graphites, produced mixes which met specification and exhibited substantially decreased sensitivity. Further testing of mixes based on these materials is recommended. Keywords include Primers explosives, Electrical primers, Caps explosives, Initiators explosives, Conducting compositions, Lead styphnate, Graphite, Carbon black, Sensitivity.
- Ammunition and Explosives