目的 为解决当前发射药包装物材料存在的结构复杂、自重大、难以适应包装工艺自动化的突出问题，选用一种可塑性较强的改性HDPE塑料作为代替材料。方法 利用差热扫描量热仪和真空安定性试验仪研究了改性HDPE塑料与典型发射药的相容性；采用加速热老化试验研究了改性HDPE塑料的力学性能变化，并预测了其热老化寿命；通过弹道射击试验研究了经过500 km公路运输和自由跌落后，改性HDPE塑料内装发射药的内弹道性能变化。结果 实验结果表明，改性HDPE塑料与典型发射药的相容性较好；进行加速热老化试验后，拉伸强度无明显变化，冲击强度出现下降趋势；在25 ℃贮存条件下，平均热老化寿命为17.51年；经运输、自由跌落试验后，改性HDPE塑料对内装发射药的保护性较好，内弹道性能无明显变化。结论 改性HDPE塑料可作为发射药用包装箱的主要材料。

The paper aims to select a type of modified HDPE plastics for replacement to solve some obvious disad-vantages including complicated structure, high weight and difficulty to adapt to the automatic packaging process of current packaging materials for gun propellants. The compatibility of the modified HDPE with typical gun propellants was investigated with differential scanning calorimeter and vacuum stability test device. The mechanical performance change of the modified HDPE was tested by accelerated thermal aging test and its thermal aging life was predicted. The changes of the internal ballistic properties of the gun propellant packaged with the HDPE plastics after road transportation for 500 km and free fall were identified through ballistic firing test. The results showed that the modified HDPE was fully compatible with the typical gun propellant. There was no obvious change to the tensile strength and the impact strength tended to decrease after the accelerated thermal aging test. The average thermal aging life was 17.51 years at a storage temperature of 25 ℃. After transportation and free-fall test, the gun propellant was well protected by package from the modified HDPE plastics and no obvious changes occurred to the interior ballistic properties of the gun propellant. Modi-fied HDPE plastics can be used as main material of plastic packaging for gun propellants.