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Dimethyl Silicone Oil

PPM-500 Phenylmethyl Silicone Fluid

Chemical Name:Phenylmethylsiloxane Polysiloxane
Product Category:Phenyl based Silicones Fluids Silicone Fluids
Structural Formula:CAS 63148-52-7
CAS No.:CAS No.63148-58-3
Molecular Formula:C6H18OSi2
Molecular Weight:210.37726

PM-50 Phenylmethyl Silicone Fluid

PPM-500 Silicone Fluid is a clear, colorless and odorless Phenylmethyl Silicone Oil with a viscosity of 500cSt @ 25°C. It replaces the Methyl groups, found in conventional PDMS Silicone oils, with Phenyl groups. In doing so, thermal stability and resistance to oxidation are significantly increased. PPM-125 provides long term stability at 250°C (open to air) and 300°C (closed to air). The fluid is further characterized by its high flash point, high dielectric strength, stability at extreme pressures, good heat capacity values, excellent lubricity and inertness to virtually all substrates.

Typical Product Data:

Viscosity @ 25°C500cSt
Specific Gravity1.11
Viscosity Temp Coefficient0.79
Pour Point °C-20°C
Flashpoint °C315°C
Ignition Temp °C482°C
Refractive Index1.500
Surface Tension28.5
Thermal Properties:

Thermal Conductivity @ 50 °C g cal/cm sec °C0.00035
Specific Heat @ 100°C0.391
Coefficient of Expansion cc/cc/°C0.00077
Gel Time, hours 250°C in Air1,500 to 2,000 hrs.
Dielectric Properties:

Dielectric Strength volts/mil420
Dielectric Constant 100Hz @25°C2.95
Dielectric Constant 100Hz @150°C2.65
Dissipation Factor 100Hz @25°C0.0008
Dissipation Factor 100Hz @150°C0.02
Volume Resistance ohm‐cm @25°C1.0×1014
Volume Resistance ohm‐cm @150°C1.0×1012


  • High Flash Point
  • High thermal Stability
  • Viscosity lowers quickly when heated:
  • Easy to pump/circulate at elevated temps
  • High Refractive Index RI 1.533
  • High Dielectric Strength
  • Hydrophobic
  • Stable under high rates of pressure
  • Stable under high rates of shear
  • Excellent Lubricity

Applications Include:

  • High Temperature Laboratory Bath Fluid
  • High Temperature Heat Transfer Fluid
  • High Temperature Dielectric Fluid
  • High Temp /High Pressure Fluid
  • High Temperature Fluids for Flow Control Fluid
  • High Temperature Calibration Fluid
  • Refractive Index Matching Fluid
  • High RI Matching Fluids for LED and Optics
  • High Temp Silicone Lubricants for Plastic Parts
  • Silicone Lubricants for Rubber Parts

Packaging Specifications

Packaging Specifications
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PM-50 Phenylmethyl Silicone Fluid : Guide

PPM-500 Phenylmethyl Fluid is the highest phenyl content silicone fluid. In comparison to conventional PDMS silicone oils, PPM-500 has much higher thermal stability and remains stable at temperatures > 250°C (open system) & 300°C closed system. When heated, its viscosity lowers very quickly which makes it an excellent choice for high temperature laboratory baths and heat transfer systems that have to circulate and pump the fluid. Conversely, it is not recommended for cold temperature systems due to its acute viscosity increase at lower temps.

As a calibration fluid, PPM-125 Silicone Fluid is widely used in Flow Control, Temperature Control and Motion Control technologies. Again, its advantage over conventional oils is that it will not break down at high temperatures and it will not coagulate at high pressures. It is widely used for instruments, gauges, sensors, meters and devices that are subject to both extreme temperatures and high pressures.

With its high phenyl content, PPM-500 Silicone Fluid has the highest RI value (1.533). It an excellent RI index matching fluid and optical fluid for use in sensor /imaging / LED and Photonics technologies that require the highest RI value.

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