Phenyl silicone oil is an excellent organosilicon compound with outstanding oxidative stability. The following is a detailed analysis of the oxidative stability of phenyl silicone oil:

1. Definition and principle
Oxidative stability refers to the ability of a substance to resist performance degradation during oxidation. For phenyl silicone oil, its oxidative stability is mainly due to its unique chemical structure and composition.

2. Oxidative stability performance
High temperature stability: Phenyl silicone oil can still maintain good stability at high temperatures. For example, silicone oil with a high phenyl mole fraction will only oxidize when heated above 250°C, and the viscosity will increase. In particular, silicone oil with a phenyl mole fraction of 50% can be used at 300~350°C for hundreds of hours after adding stabilizers. In addition, the physical properties of silicone oils with medium and high phenyl contents remain basically unchanged after being heated at 250°C for thousands of hours, showing excellent thermal stability.
Long-term stability: Phenyl silicone oil can also maintain good oxidative stability during long-term use. This enables it to work normally under harsh environments such as high temperature, high pressure, and strong radiation, extending its service life.

3. Influencing factors
Phenyl content: As the phenyl content increases, the oxidative stability of silicone oil will also increase accordingly. This is because the introduction of the phenyl group strengthens the interaction between silicone oil molecules, thereby improving its antioxidant properties.
Additives: The oxidative stability of phenyl silicone oil can be further improved by adding stabilizers such as antioxidants. These additives can capture and consume free radicals, thereby slowing down the rate of oxidation reactions.

4. Application areas
Due to its excellent oxidative stability, phenyl silicone oil is widely used in various fields:

Heat treatment of metal products: using its high thermal stability and oxidative stability, as a heat treatment bath and high-temperature heating oil.
Electronic and electrical equipment: as a high and low temperature lubricant, it is used in electronic and electrical equipment to ensure that it can still work normally in high or low temperature environments.
Cosmetics: using its high light transmittance, high refractive index, good thermal stability, and radiation resistance, it is used as an additive for personal care products such as skin care products and conditioners. It can also be used as a gloss agent in different cosmetic formulas.
High vacuum diffusion pump oil: It is used as ultra-high vacuum diffusion pump oil because of its steeper vapor pressure/temperature curve, lower vapor pressure and freezing point, and excellent heat resistance and oxidation resistance.

In summary, phenyl silicone oil has excellent oxidation stability, can maintain normal operation in harsh environments such as high temperature, high pressure, and strong radiation, prolongs service life, and is widely used in various fields.