Disadvantages of silicone oil

(1) Silicone oil has poor lubricity, especially for steel-steel friction pairs.
(2) Silicone oil has a large coefficient of thermal expansion (may cause overpressure problems).
(3) High gas solubility (difficult to design gas sealing device).
(4) Certain hygroscopicity (after the water content is higher than 100×10-6, the electrical performance drops sharply).
(5) Small surface tension (easy to leak from the machine).