To distinguish between true and false silicone oils, you must first understand silicone oil and understand the characteristics of silicone oil.
Silicone oil is a polyorganosiloxane with different polymerization degree chain structure. It is obtained by hydrolysis of dimethyldichlorosilane with water to obtain a polycondensation ring. The ring body is cracked and rectified to obtain a low ring body, and then The ring body, the heading agent and the catalyst are tempered together to obtain a mixture of various polymerization degrees, and the low-boiling substance is removed by distillation under reduced pressure to obtain a silicone oil.

Silicone oil features: excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertness and small surface tension, in addition to low viscosity temperature coefficient, high compression resistance, and some varieties also have Radiation resistant, non-corrosive to metals, non-toxic, etc.

Silicone oil: commonly used as high-grade lubricants, anti-vibration oils, insulating oils, defoamers, mold release agents, polishing agents and vacuum diffusion pump oils. Among the various silicone oils, methyl silicone oil is the most widely used, and is the most important type of silicone oil, followed by methylphenyl silicone oil. In addition, there are ethyl silicone oil, methylphenyl silicone oil, nitrile-containing silicone oil, and the like. Various functional silicone oils and modified silicone oils are mainly used for special purposes.

True and false silicone oil identification:
1. Use the eye to observe: the fake silicone oil will be more turbid, the smell is bigger, and there is odor;
2. Test with fire: use a glass rod or iron rod to ignite with a small amount of silicone oil. It can be ignited and black smoke is white mineral oil. Pure silicone oil is not ignited by fire, and it is odorless, clear and transparent, non-toxic. . The silicone oil ignition point is 320 degrees.
3. Freezing point test method: Silicone oil will not freeze at -50 degrees, and the fake silicone oil will appear turbid or frozen.


Silicone oil advantages:
1. Excellent shear stability, absorption vibration, vibration transmission prevention function, can be used as damping fluid.
2. Excellent thermal oxidation stability, such as thermal decomposition temperature >300 ° C, low evaporation loss (150 ° C, 30 days, evaporation loss is only 2%), oxidation test (200 ° C, 72 h), small changes in viscosity and acid value .
3. Excellent electrical insulation, volume resistance, etc. do not change in the range of normal temperature ~ 130 ° C (but not water in the oil).
4. It is a non-toxic, low foaming, anti-foaming oil that can be used as a defoamer.
5. Viscosity and temperature performance is the best among liquid lubricants, and the viscosity changes little in the wide temperature range. Its freezing point is generally less than -50 ° C, and some as high as -70 ° C, long-term storage at low temperatures, the appearance of oil, viscosity does not change, it is a base oil with high temperature, low temperature, wide temperature range.

Silicone oil disadvantages:
1. The surface tension is small (easy to leak from the machine).
2. Gas solubility is large (it is difficult to design a gas seal device).
3. Silicone oil has a large thermal expansion coefficient (probably overpressure problem).
4. Silicone oil has poor lubricity, especially for steel steel friction pairs.
5. A certain hygroscopicity (after the water content is higher than 100×10-6, the electrical performance drops sharply)