I. Core Characteristics and Chemical Structure

Chemical Structure

Physicochemical Properties

• Wide temperature stability: Can be used continuously at -50°C to 200°C, and withstand higher temperatures for short periods. It maintains fluidity even at low temperatures (e.g., the 5cSt grade remains liquid in liquid nitrogen at -196°C).
• Adjustable viscosity: Viscosity ranges from 5 to 1,000,000 centistokes (cSt), from extremely thin liquid to semi-solid gel, which can be adjusted to meet the needs of different scenarios.
• Physiological inertness: Non-toxic and non-irritating, compliant with FDA, EU and other pharmaceutical-grade standards, and can directly contact human tissues.

Chemical Stability

II. In-depth Analysis of Industrial Applications

1. Medical and Life Sciences

• Medical device lubrication: Low-viscosity (e.g., 5cSt) dimethyl silicone oil is used as a coating for surgical instruments, catheters, and syringes, which can reduce the friction coefficient to 0.012 and minimize tissue damage. For example, it is used as a lubricant for hair follicle extraction in hair transplant surgery to improve transplantation survival rate.
• Drug carrier and excipient: Serves as an ointment base to enhance transdermal drug absorption, or as a lubricant for oral liquid bottle caps (complies with GB 9685-2016 food contact standard), reducing the opening torque by 30%-40%.
• Defoamer and therapeutic application: The main component of oral gastrointestinal defoaming tablets and pulmonary edema defoaming aerosols, relieving symptoms through its defoaming effect.

2. Electronics and Power Industry

• Precision electronic component protection: 5cSt ultra-low viscosity silicone oil penetrates micron-level gaps (e.g., <10μm gaps between chip packaging pads) to form an ultra-thin insulating film of 0.1-0.5μm, suitable for 5G radio frequency components and high-frequency transformers.
• Insulation and cooling of power equipment: With a dielectric constant of 2.7-2.8, it is superior to most organic materials. Used as transformer oil and capacitor impregnating fluid, it can reduce power loss by 50% and extend equipment service life. For example, it replaces mineral oil in on-board transformers to improve flame retardancy and stability.
• Extreme environment application: Under high vacuum (10⁻⁶ Pa) and space radiation, the evaporation loss of 5cSt silicone oil is <0.01%/1000h, which is used for lubrication of satellite antenna drive mechanisms.

3. Industrial and Mechanical Manufacturing

• High-temperature lubrication and damping: Grades with 350-1000cSt are used for lubrication of high-temperature chains and gearboxes, maintaining stable lubrication performance above 200°C and reducing carbon deposition. High-viscosity (tens of thousands to hundreds of thousands of cSt) silicone oil is used as the medium for automotive engine torsional vibration absorption dampers to enhance durability.
• Metal processing and mold release: 100-2000cSt silicone oil is used for mold release in metal stamping and injection molding, reducing friction coefficient and preventing adhesion, especially suitable for high-temperature molding phenolic resin and unsaturated polyester materials.
• Sealing and protection: Coated on door, window, and curtain wall seals to form a hydrophobic film, improving weather resistance and sealing performance.

4. Daily Chemicals and Personal Care

• Skin care products and cosmetics: 500-1000cSt silicone oil is used as a smoothing agent in creams and sunscreen sprays, forming a breathable protective film while providing a "zero-stickiness" skin feel (residual oil <0.2mg/cm²). Quick-drying sunscreen sprays (compounded with ethanol) form a film in 30 seconds, with a waterproof rating of IPX4.
• Hair care products: 350-500cSt silicone oil is used in shampoos and hair masks to repair frizzy hair and resist static electricity, making hair smooth and easy to comb.

5. Food and Packaging

• Food processing aids: Food-grade silicone oil (350-1000cSt) compliant with GB 30612-2014 is used as a baking release agent and chocolate coating anti-sticking agent, with a dosage ≤0.2g/kg and residual amount meeting FDA and EU regulations.
• Packaging material protection: Coated on the inner wall of food packaging to prevent adhesion of contents and extend shelf life, such as lubrication of aluminum-plastic cap liners.

6. Innovative Applications in Special Fields

• Aerospace: 5cSt silicone oil has a viscosity change coefficient <1.5 in the range of -60°C~120°C, serving as a damping medium for precision gyroscopes to ensure attitude control accuracy.
• Microfluidics and biomedicine: PDMS elastomers are used to manufacture microfluidic chips, whose air permeability and biocompatibility support experiments such as cell culture and drug screening.
• Cultural relic protection: Low-viscosity silicone oil penetrates into wood and paper to form a hydrophobic barrier, preventing moisture and oxidation damage.

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