Propellant Categorisation Trials,
DEPARTMENT OF DEFENCE CANBERRA (AUSTRALIA)
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The tests conducted showed that medium calibre propellant AR5401, and by analogy small arms propellant AR2201, can be classified as HD 1.3 when transported in M2 cans palletised in an ISO freight container. The tests do not cover the effects of an external detonation as may be experienced in times of hostilities but cover a typical severe practical disaster that may confront the civilian transportation of propellant. Both AR2201 critical height 13 inches and AR5401 critical height 7 inches exhibited UN HD 1.3 behaviour in M2 cans with greater powder column heights. M2 cans have considerably higher venting pressures than the copper lined wooden boxes traditionally used for transport of small web powders. The time which elapsed between fire outbreak and propellant ignition suggests strong possibility for fire control or event minimisation by the use of drenches, etc.