It showed a very low coefficient of thermal expansion (CTE), which is 0.95 ppm/°C over a temperature range of -150-100 °C and relatively low coefficient of moisture expansion (CME), which is only 13.30 ppm/% RH (0~90% RH).  Besides, it simultaneously meets the optical, thermal, and mechanical requirements for space telescope use. 
THERM
It showed a very low coefficient of thermal expansion (CTE), which is 0.95 ppm/°C over a temperature range of -150-100 °C and relatively low coefficient of moisture expansion (CME), which is only 13.30 ppm/% RH (0~90% RH).  Besides, it simultaneously meets the optical, thermal, and mechanical requirements for space telescope use. 
THERM
It showed a very low coefficient of thermal expansion (CTE), which is 0.95 ppm/°C over a temperature range of -150-100 °C and relatively low coefficient of moisture expansion (CME), which is only 13.30 ppm/% RH (0~90% RH).  Besides, it simultaneously meets the optical, thermal, and mechanical requirements for space telescope use. 
THERM
It showed a very low coefficient of thermal expansion (CTE), which is 0.95 ppm/°C over a temperature range of -150-100 °C and relatively low coefficient of moisture expansion (CME), which is only 13.30 ppm/% RH (0~90% RH).  Besides, it simultaneously meets the optical, thermal, and mechanical requirements for space telescope use. 
THERM