Ammonium nitrate based explosives do not undergo self-sustained combustion when the pressure is lower than some threshold value

which is called the minimum burning pressure (MBP). The MBP has become a significant parameter in the production and management of ammonium nitrate based explosives. In order to study the effect of oil content on the safety of ammonium nitrate

the MBP values of samples were measured by pressurized vessel test. At room temperature

samples with 0 to 10% oil content were measured

and the MBP values of the samples were reduced from 6 MPa to 1.59 MPa. Samples with 4%

6%

8% and 10% oil content were measured at 20℃

75℃ and 100℃

and the MBP values of the samples decreased from 2.25

2.01

1.75 and 1.59 MPa to 1.51

1.05

0.41 and 0.21 MPa

respectively. The results showed that the MBP values decreased with the increase of oil content at normal temperature. In addition

the MBP values of the ammonium nitrate mixed with oil decreased obviously when the initial temperature was increased.