1. RTV silicone sealants for filling are widely used as flow sealants in automobiles, thanks to their ability to withstand high temperatures in various states. Silicones are the only elastomers that can remain flexible at freezing temperatures of -45°C and are therefore also used in the refrigeration industry. This ability also allows silicones to be used in the aerospace industry. As the only elastomer that remains flexible at low temperatures, the silicone in the lunar boots worn by astronauts was the first substance to touch the moon in 1969. In addition to low-temperature flexibility, silicone resin's UV resistance determines its application in artificial satellites and spacecraft.