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美国加州爱德华空军基地的火箭推进研究所,正在对用凯夫拉合成纤维代替石棉作为待选的绝热材料进行性能评定。多年来,温石棉一直是用于固体推进剂与发动机壳体之间的绝热硬炭化层的主要绝热纤维填料。但是由于温石棉主要是靠进口的,它是一种被怀疑为有致癌作用的材料,而且又是一种战略性原料,所以国防部在几年前就已开始评定改用其它替代材料、工艺和设计。
The Rocket Propulsion Institute at Edwards AFB, California, USA, is evaluating the performance of Kevlar synthetic fibers instead of asbestos as an alternative thermal insulation material. For many years, chrysotile has been the main insulation fiber filler for the adiabatic hard carbonized layer between the solid propellant and the engine casing. However, since chrysotile asbestos is mainly imported, it is a material suspected of being carcinogenic and a strategic raw material, the Department of Defense began assessing the switch to other alternative materials several years ago, And design.