1. Phenyl Silicone Oil: High-Temperature Performance Leader

Applications
By introducing phenyl groups into the polysiloxane backbone, phenyl silicone oil demonstrates enhanced thermal stability and radiation resistance. Low-phenyl variants (-70℃ fluidity) excel in cryogenic environments, while high-phenyl types (stable above 250℃) are widely used in LED encapsulation, aerospace materials, and high-temperature lubricants. In electronic insulation, its compatibility surpasses conventional silicone oils, serving as gas chromatography carriers and transformer impregnants.

Advantages

• Broad temperature range (-70℃ to 350℃)
• Superior radiation and oxidation resistance
• Excellent compatibility with metals and organic solvents

Disadvantages

• Higher cost than dimethyl silicone oil
• Reduced low-temperature fluidity with increased phenyl content

2. Dimethyl Silicone Oil: The Benchmark for General-Purpose Use

Applications
As the most widely applied silicone oil, dimethyl silicone oil covers viscosity ranges from 0.65 to 1,000,000 mm²/s, serving textile auxiliaries, defoamers, mold release agents, and hydraulic fluids. In textiles, low-viscosity products act as cotton oiling agents, while medium-high viscosity variants function as sewing thread lubricants. Medically, its defoaming properties are utilized in pulmonary edema aerosols and endoscopic agents.

Advantages

• Cost-effective with high versatility
• Strong chemical stability and weather resistance
• Good biocompatibility

Disadvantages

• Inferior high-temperature performance compared to phenyl silicone oil
• Limited lubrication under extreme conditions

3. Ethyl Silicone Oil: Dual Advantages in Low Temperature and Insulation

Applications
Through ethyl substitution, ethyl silicone oil maintains stability from -60℃ to 150℃, finding applications in electrical insulation, precision instrument lubrication, and specialty hydraulic fluids. Its low volatility and non-toxicity make it ideal for rubber mold release agents, while acting as plasticizers to enhance rubber flexibility.

Advantages

• Superior low-temperature performance versus dimethyl silicone oil
• Strong dielectric properties for high-voltage applications
• Non-corrosive with long service life

Disadvantages

• Less stable at high temperatures than phenyl silicone oil
• Limited lubrication under heavy loads

4. Fluorosilicone Oil: Extreme Condition Lubrication Specialist

Applications
By incorporating trifluoropropyl groups, fluorosilicone oil operates effectively from -40℃ to 240℃. Its chemical inertness makes it preferred for vacuum pump lubricants, polar bearing lubricants, and fuel system coatings. In textiles, treated fabrics exhibit oil/water repellency; in coatings, its low surface energy enables marine vessel antifouling applications.

Advantages

• Exceptional oil/solvent resistance
• Low friction coefficient with extended lubrication life
• Extreme chemical stability

Disadvantages

• Significantly higher cost than other silicone oils
• Complex synthesis process with limited production capacity