The low temperature range of silicone oil varies depending on its type and performance. Generally speaking, silicone oil has good low temperature resistance, and its low temperature resistance range can usually reach -50℃ to -70℃. This means that in such a low temperature environment, silicone oil can still maintain its original fluidity and lubricity, and will not solidify or degrade in performance.
Specifically, the flow point of medium and low sulfur silicone oil is basically around -50℃, and some special types of medium and low sulfur silicone oil can even withstand low temperatures of -70℃, and still have good fluidity at this temperature. This excellent low temperature performance allows silicone oil to work normally under extreme low temperature conditions, so it is widely used in various occasions that require low temperature resistance lubrication and sealing.
In addition, silicone oil has other excellent properties, such as high temperature resistance, oxidation resistance, good chemical stability, small viscosity-temperature coefficient, small surface tension, high compressibility, good shear resistance, good light transmittance and excellent electrical insulation performance, etc. These properties make silicone oil widely used in industrial and agricultural production, national defense industry, scientific research and medical health.
In general, the low-temperature range of silicone oil varies depending on its type and performance, but generally speaking, its low-temperature resistance is quite outstanding and can meet the needs of various occasions requiring low-temperature resistant lubrication and sealing.
So, does the viscosity of silicone oil affect low temperature performance?
The relationship between viscosity and low-temperature fluidity
The viscosity of silicone oil depends on the interaction between molecules, including intramolecular interaction and intermolecular interaction. At low temperatures, the interaction between silicone oil molecules is enhanced, and the intermolecular force will also increase, resulting in a close arrangement of silicone oil molecules and poor fluidity. Therefore, silicone oil with higher viscosity is more likely to become viscous at low temperatures and its fluidity decreases.
Effect of viscosity on low temperature applications
Lubrication performance: In low temperature environments, silicone oils with higher viscosity may not provide adequate lubrication, causing mechanical equipment, instruments and electronic components to malfunction due to insufficient lubrication. On the contrary, silicone oils with lower viscosity can still maintain good fluidity at low temperatures, thus providing better lubrication.
Sealing performance: When silicone oil is used as a sealant, its viscosity will also affect its sealing performance. Silicone oils with lower viscosity are more likely to penetrate into the parts that need to be sealed at low temperatures to form an effective sealing layer. Silicone oils with higher viscosity may not be able to fully penetrate into the sealing parts due to insufficient fluidity.
