EPDM/aramid fibers ablatives represent the state of the art of Elastomeric Heat Shielding Materials (EHSMs) for Solid Rocket Motors (SRMs). EPDM exhibits the lowest density among elastomers maximizing the payload of a SRM. Due to necessity to further maximize the payload of a rocket, density reducer fillers, such as glass or phenolic microballoons, can be considered in the material formulation of the SRM insulation liner. However, the open literature on EPDM based EHSMs combined with these density reducers is extremely limited because these formulations are generally proprietary of companies manufacturing SRMs. In our paper we studied the heat capacity, thermal and dimensional stability, mechanical properties, and ablation resistance of EPDM based EHSMs combined with glass microspheres at different percentages. The main aim was to evaluate Perlite, an affordable density reducer additive commonly used in concrete applications, as a possible replacement of glass microballoons.

EPDM /芳族聚酰胺纤维烧蚀剂代表了用于固体火箭发动机（SRM）的弹性隔热材料（EHSM）的技术水平。EPDM在弹性体中表现出最低的密度，从而最大程度地提高了SRM的有效载荷。由于有必要进一步最大化火箭的有效载荷，因此可以在SRM隔热衬套的材料配方中考虑使用密度降低剂，例如玻璃或酚醛微气球。但是，有关基于EPDM的EHSM与这些密度降低剂结合使用的公开文献极为有限，因为这些配方通常是制造SRM的公司的专有财产。在我们的论文中，我们研究了基于EPDM的EHSM与玻璃微球以不同百分比组合的热容，热稳定性和尺寸稳定性，机械性能和耐烧蚀性。主要目的是评估珍珠岩，