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The viscosity of silicone oil is an important indicator for selecting the specification and model of silicone oil , and its fluidity can be distinguished by the viscosity of silicone oil . The smaller the viscosity, the better the fluidity . The viscosity of silicone oil 0.65 centistokes to several million centistokes, and the silicone oil of millions of centistokes hardly flows at room temperature .

The unit of viscosity .

The viscosity unit of silicone oil is expressed in mm ² /S , and the common unit is cst ( centistokes), 1mm ² /S ≈ 1cst

Second, the detection method of viscosity

1. When the viscosity is ≤ 1000m m ² /S , it shall be measured according to the provisions of Chapter 2 ( capillary method ) of GB /T 10247-2008 , and the measurement temperature shall be 25 ℃ .

2. When the viscosity is > 1000mm ² /S , it shall be measured according to the provisions of Chapter 4 ( rotation method ) of GB /T 10247-2008 , and the measurement temperature shall be 25 ℃ .

3. Effect of temperature on viscosity

   Silicone oil has a small viscosity- temperature coefficient , that is, the temperature has little effect on the change of viscosity , but it still has an effect . As the temperature increases, the viscosity will also decrease. The viscosity indicated by each manufacturer refers to the viscosity measured at 25 °C .

Fourth , the relationship between viscosity and molecular weight

The silicone oil obtained by    the equilibrium reaction , although the low boilers have been removed , is not a product of a single degree of polymerization, but polysiloxanes of various degrees of polymerization . The greater the viscosity , the greater its molecular weight .