Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

9-250 Phenylmethyl Silicone Oil

Dow Corning 9-250 Phenylmethyl Silicone Oil is a high-purity, low-volatility fluid from the Dow Corning® silicone oils series. Featuring phenyl and methyl substituents on the siloxane backbone, it delivers exceptional thermal stability, low-temperature flexibility, and excellent dielectric properties. Widely used in lubricants, heat-transfer fluids, and cosmetic formulations where oxidative resistance and viscosity stability are critical.
  • 9 250 phenylmethyl silicone oil_11647182
  • 9 250 phenylmethyl silicone oil_11647182

Features Of 9-250 Phenylmethyl Silicone Oil

  1. Excellent thermal stability up to 250 °C, maintaining viscosity integrity under prolonged high-temperature exposure.

  2. Superior oxidative resistance due to phenyl group incorporation, minimizing degradation in air-rich environments.

  3. Low volatility and high flash point, enhancing safety during high-temperature processing and storage.

  4. Broad compatibility with organic resins, elastomers, and fillers—ideal for formulating high-performance composites.

  5. Outstanding dielectric properties with low dissipation factor, suitable for electrical insulation applications.

Typical Applications Of 9-250 Phenylmethyl Silicone Oil

  1. Heat-transfer fluids in closed-loop industrial heating systems requiring extended service life at elevated temperatures.

  2. Base fluid in high-temperature greases for aerospace bearings and automotive turbocharger lubrication.

  3. Release agent for silicone rubber molding and composite curing tooling in aerospace and energy sectors.

  4. Dielectric coolant in high-voltage transformers and power electronics encapsulation compounds.

  5. Viscosity modifier and thermal stabilizer in phenyl-containing silicone resins and RTV/HTV formulations.

Specifications Of 9-250 Phenylmethyl Silicone Oil

Chemical TypePhenylmethyl polysiloxane
Product FormClear, colorless to pale yellow liquid
AppearanceHomogeneous, transparent, free of sediment or haze
Viscosity (25 °C, cSt)250 ± 20
Specific Gravity (25 °C)1.03–1.06
Flash Point (COC, °C)≥ 310
Thermal Stability (Air, 250 °C, 24 h)≤ 5% viscosity change; no gel formation
Dielectric Strength (kV/mm)≥ 18 (ASTM D877)


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