Overview of Core Applications of Ordinary Dimethyl Silicone Oil (300,000–1,000,000 cSt)
Dimethyl silicone oil with a viscosity of 300,000 to 1,000,000 cSt is classified as ultra-high viscosity.
It features excellent film-forming property, outstanding damping effect, long-lasting lubrication, and high stability, making it irreplaceable in mechanical damping, mold release, electronic sealing, high-end personal care, and other fields.
1. Machinery Industry: Long-Lasting Lubrication & Damping Buffer (Core Application)
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Damping fluid / Shock absorberRecommended viscosity: 500,000–1,000,000 cStUsed in pressure gauges, thermometers, flow meters, rotary dampers, buffers, and automotive/mechanical control valves to suppress vibration and pulsation.
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Long-term lubricantRecommended viscosity: 300,000–800,000 cStHigh temperature resistance (-50°C to 200°C), anti-oxidation, low volatility.Used for O-rings, seals, valves, bearings, gears, and precision instruments.
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Liquid spring / Impact absorptionRecommended viscosity: 800,000–1,000,000 cStUsed in industrial equipment and precision machinery for shock absorption and protection.
2. Molding Industry: High-Efficiency Mold Release & Surface Protection
Recommended viscosity: 500,000–800,000 cSt
Applied to:
- Plastic injection/extrusion molding (ABS, PC, PP, PE, etc.)
- Rubber vulcanization/compression molding (tires, seals, O-rings)
- Metal die-casting / precision casting
- Digital printing presses to prevent ink sticking.
3. Electronic & Electrical Industry: Sealing, Protection & Insulation
Recommended viscosity: 800,000–1,000,000 cSt (sealing); 300,000–500,000 cSt (insulation)
Used for:
- Moisture-proof sealing of electronic components, sensors, PCBs
- Base oil for thermal greases
- Insulation and filling for transformers, capacitors, cable joints
- Lubrication of electronic connectors to improve durability.
4. Daily Chemical & Personal Care: High-End Film-Forming & Long-Lasting Moisturizing
Recommended viscosity: 300,000–500,000 cSt
Used in:
- High-end skin care: creams, lotions, sunscreens
- Hair care: hair masks, serums, styling products
- Cosmetics: lipsticks, foundations, eye shadows for better spreadability and water resistance.
5. Building Materials & Waterproofing: Hydrophobic Modification
Recommended viscosity: 300,000–500,000 cSt
Used for:
- Hydrophobic treatment of glass and ceramics
- Water repellent treatment of mineral wool / insulation materials
- Modification of coatings and adhesives
- Concrete waterproofing.
6. Other Special Applications
- Car & home care: polishes, furniture wax, floor care agents
- Defoamers: used in chemical, textile, paper, fermentation industries
- Medical devices: lubricating coatings for catheters, syringes
- Diffusion pump oil: for high-vacuum systems.
Viscosity Selection Guide (300,000–1,000,000 cSt)
- 300,000–500,000 cSt: Balanced fluidity and film-forming; suitable for daily chemicals, construction materials, electronics.
- 500,000–800,000 cSt: Good damping and mold release; suitable for machinery and molding.
- 800,000–1,000,000 cSt: Ultra-high viscosity for sealing and shock absorption; ideal for electronics and high-pressure damping systems.
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