The basic properties of phenyl silicone oil can be summarized as follows:

1. Chemical structure and composition
Phenyl silicone oil is the product of partial methyl substitution of phenyl in methyl silicone oil.
Its molecular structure contains phenyl groups, which gives it unique physical and chemical properties.

2. Physical properties
Appearance: colorless to yellow transparent oil, free of mechanical impurities.
Refractive index: relatively high, generally between 1.46 and 1.485, higher than dimethyl silicone oil.
Viscosity: The viscosity range is wide depending on the specific product and application requirements.
Flash point: usually high, ≥250℃, indicating good thermal stability.

3. Temperature resistance
Low temperature resistance: Silicone oil with low phenyl content (phenyl mole fraction 5%~10%) is particularly suitable for occasions with high cold resistance requirements, and still has fluidity at -70℃ or even -120℃.
High temperature resistance: With the increase of phenyl mole fraction, the high temperature resistance of silicone oil is significantly improved. Medium phenyl and high phenyl silicone oils have high thermal stability and can be used in applications under high temperature environments.

4. Other properties
Electrical properties: It has excellent electrical insulation properties and is suitable for insulation and lubrication of electrical and electronic equipment.
Radiation resistance: Medium phenyl and high phenyl silicone oils have excellent radiation resistance and can be used in applications that require radiation resistance.
Lubrication properties: In the field of electronic and electrical equipment, phenyl silicone oil is used as a high and low temperature lubricant to effectively reduce friction and wear and extend the service life of the equipment.
Compatibility: It has good compatibility with various components of cosmetics and is widely used as an additive for care products and cosmetics such as shampoo and makeup.
Reactivity: Hydroxyl-terminated phenyl silicone oil has good hydrophilicity and reactivity and can be used to prepare water-based coatings, inks, etc.

5. Application fields
Cosmetics: Used to increase gloss, softness and smoothness.
Electronic appliances: As a potting material, impregnation mold and demoulding material, as well as a component of adhesives.
Aerospace: Used for sealing rings, gaskets, pipes, rods, etc. that are resistant to cold and burning, heat aging and radiation.
LED packaging: As an important component of packaging glue raw materials, it improves high temperature resistance, radiation resistance and refractive index.
Others: It can also be used in oil fields, hydraulics, mining, instruments, insulation, etc.

In summary, phenyl silicone oil has many excellent properties and a wide range of applications, and is an important silicone material.