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Dow Corning PMX-200-12500CST is an ultra-high viscosity dimethyl silicone oil in Dow Corning's PMX-200 series. Designed for precision mechanical damping, high-end insulation protection, aviation hydraulic and textile soft finishing, it is a high-purity linear polydimethylsiloxane material with extreme shear resistance, wide temperature stability and excellent dielectric propertie
Ultra-High Viscosity Damping - Ultra-high viscosity, excellent damping and buffering effect, stabilizing instrument readings
Extreme Shear Resistance - Strong shear resistance, performance does not attenuate under long-term stress, long service life
Wide Temperature Stability - Can be used continuously at -45℃~180℃, stable performance under extreme temperatures
Excellent Dielectric Protection - High dielectric strength, resistance to arc and corona, suitable for high-end electrical insulation needs
Precision Damping Field - Damping oil for aircraft and automobile instruments, buffering vibration and stabilizing readings
High-End Insulation Field - Insulating impregnant for transformers and precision electronic components, ensuring electrical safety
Aviation Hydraulic Field - Core component of aviation hydraulic oil, suitable for hydraulic system operation under harsh working conditions
Textile Finishing Field - High-end fabric softener, endowing fabrics with delicate and soft touch
| Brand | Dow Corning |
| Chemical Name | Dimethyl Silicone Oil (Linear Polydimethylsiloxane) |
| English Alias | Dimethyl Silicone Fluid |
| CAS No. | 63148-62-9 |
| Active Ingredient Content | 99.9 % |
| Viscosity (25℃) | 12,500 cSt |
| Specific Gravity (25℃) | 0.976 |
| Refractive Index (25℃) | 1.403 |
| Viscosity-Temperature Coefficient | 0.61 |
Q1: What is the primary functional role of PMX-200-12500CST in formulations?
A: PMX-200-12500CST is a high-viscosity, linear polydimethylsiloxane used primarily as a lubricating, leveling, and surface-modifying agent—imparting slip, softness, and reduced coefficient of friction to coatings, personal care emulsions, and industrial lubricant blends.
Q2: Is this silicone oil compatible with common organic solvents and polymer systems?
A: Yes—PMX-200-12500CST exhibits broad compatibility with hydrocarbon solvents, esters, and many thermoplastic and thermoset resin systems. It is immiscible with water and low-molecular-weight alcohols, and may require stabilization or dispersion aids when incorporated into polar aqueous or highly reactive matrices.
Q3: How does viscosity affect its processing and end-use performance?
A: With a nominal viscosity of 12,500 cSt at 25°C, this grade offers enhanced film persistence and resistance to migration compared to lower-viscosity silicones. Its high molecular weight supports long-lasting surface effects but may require elevated temperature or mechanical shear for uniform incorporation into viscous or high-solids systems.
Q4: Can PMX-200-12500CST be used in applications requiring thermal stability?
A: Yes—it retains structural integrity and functional performance across a wide temperature range, typically from −40°C to over 150°C under inert conditions. Oxidative degradation becomes more pronounced above 200°C, so long-term use at elevated temperatures should consider atmospheric exposure and residence time.
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