Science and Technology of Energetic Materials

Vol.61, No.3 (2000)

Research paper

Burning characteristics of emulsion explosives (II) 
- DDT test -(*in Japanese)
Yoshikazu Hirosaki, Satoru Suzuki, Yasuhiro Takahashi, 
and Yukio Kato


A probability of deflagration to detonation transition (DDT) was evaluated for the emulsion explosives containing glass microballoon (GMB) or resin microballoon (RMB) as the density control material with small sized DDT equipment that has been arranged from the French method. All the tests were performed at the elevated initial temperature of around 100℃ to evaluate the safety in the manufacturing process of the emulsion explosives. The emulsion explosives containing RMB showed no steady reaction. The emulsion explosives sensitized by GMB caused partial reaction that lead to the rupture of steel pipe close to the screw cap, followed by the reaction interruption without explosion. The GMB-sensitized emulsion explosives containing aluminum powder of 33 μm in diameter showed steady burning or deflagration just like in the case of black powder. No evidence of causing detonation during test was derived. Installing a rupture disc to pipe as safety device is confirmed to be effective to release the pressure induced by the partial reaction and to prevent the violent reaction due to DDT .

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