不挥发残留物 meaning in English

non-volatile residue

Standard test method for gravimetric determination of nonvolatile residue in environmentally controlled areas for spacecraft
航天器在环境受控范围内的不挥发残留物重量分析测定的标准试验方法
Standard practice for handling , transporting , and installing nonvolatile residue sample plates used in environmentally controlled areas for spacecraft
宇宙飞船在环境受控区域内使用的不挥发残留物取样板的装卸运输和安装的标准实施规程