Application of Silicone Oil in Diffusion Pump Systems
Tetramethyltetraphenyltrisiloxane and trimethylpentaphenyltrisiloxane, when used as diffusion pump oils, can achieve extremely high vacuum degrees ranging from 10-9 to 10-8 Pa. Due to the excellent heat resistance, heat oxidation resistance, chemical stability, and non-corrosive nature of silicone oil, it demonstrates significant advantages in durability compared to traditional petroleum-based or fatty acid ester diffusion pump oils.
During the operation of the diffusion pump, even if the heater (450 watts) is not switched off after 15 minutes of operation, and the pressure is restored to normal pressure using air and maintained for 1 minute before continuing the operation, such cyclic operations do not affect the performance of the silicone oil.
Application of Heat Transfer Media
Silicone oil has good heat oxidation resistance, low vapor pressure, and high flash point, and can be used as various high-temperature baths and high-temperature heat transfer media.
Dimethyl silicone oil can be used stably in air below 175°C for a long time, and methylphenyl silicone oil can even be used at high temperatures of 200°C for a long time, making them ideal choices for high-temperature applications.
By adding specific heat-resistant additives to dimethyl silicone oil and methylphenyl silicone oil, the applicable temperature range of silicone oil can be further expanded. Such modified silicone oil can be used as a heat transfer medium in rubber continuous vulcanization equipment, in plastic extruders, in petrochemical equipment, and as a heat transfer medium for heat collection in solar energy systems, thereby expanding the application scope of silicone oil in industrial applications.