Testing og karakterisering av PBXN-110

Two charges of HMX crystals with crystal size distribution as class 2 and 3 have been used in production of PBXN-110 with 87.2 wt.% HMX. The purpose of the production of PBXN-110 was to study if used crystals could have improved properties with regard to shock sensitivity. In Intermediate Scale Gap test the study composition gave a shock sensitivity of 34 kbar, a result in accordance with what we normally have achieved for PBXN-110. The obtained shock sensitivity of PBXN-110 indicate the used crystals Ch 1722/06 and Ch. 1740/06 have no RS (reduced Sensitivity) properties, even though the obtained shock sensitivity was in the lower range of what is reported in the literature for shock sensitivity of PBXN-110. Curing for 4 days at 50o C gave a composition that satisfies the requirement for Shore A15s hardness and strain at max stress. Obtained max stress by unaxial tensile testing was however below the requirement of 0.138 MPa. The critical diameter have been determined by initiating a cone of the explosive, and was found to be 5.4+1.3 mm. Detonation velocity has been measured to 7160 m/s, and the detonation pressure measured by use of Plate Dent test to 175 kbars. The last two results are unsure since we have respectively only one and two measurements.