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Dimethyl Silicone Oil

PM-50 Phenylmethyl Silicone Fluid

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

PM-50 Phenylmethyl Silicone Fluid

PM-50 Silicone Fluid is a clear, colorless and odorless Phenylmethyl Silicone Oil with a viscosity of 50cSt @ 25°C. It replaces methyl groups found in conventional PDMS Silicone oils with Phenyl groups. In doing so, thermal stability and resistance to oxidation are significantly increased. PM-50 remains stable at 204°C (open to air) and 260°C (closed to air). The fluid is further characterized by its high flash point, high dielectric strength, stability at extreme pressures, excellent lubricity and inertness to virtually all substrates.

Typical Product Data:

Viscosity @ 25°C50cSt
Specific Gravity0.985
Viscosity Temp Coefficient0.655
Pour Point °C-57°C
Flashpoint °C275°C
Ignition Temp °C482°C
Refractive Index1.425
Surface Tension25.0
Dielectric Properties:

Electrical Strength13.8kV/mm
Permittivity @ 100Hz2.77
Permittivity @ 1MHz2.77
Dissipation factor @ 100Hz0.0003
Dissipation factor @ 1MHz0.00005
Volume resistivity ohm.cm1x10hz
Dielectric Constant2.77
Thermal Properties:

Thermal Conductivity0.15 W/(m.K)
Specific Heat @ 100°C0.405
Coefficient of Expansion cc/cc/°C0.00096
Gel Time, hours 250°C in Air220‐260 hrs
Viscosity @ Temperature:

  • High Flash Point
  • Formulated for stability at both low high temperature
  • Low viscosity change at temperature (low VTC): easy to pump and circulate the fluid at low temperature
  • High Refractive Index RI 1.425
  • 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
  • Low Temperature Bath Fluid
  • High Temperature Heat Transfer Fluid
  • Low Temperature Heat Transfer Fluid
  • High Temperature Dielectric Fluid
  • High Temp /High Pressure Fluid
  • High Temperature Fluids for Flow Control 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
  • High Temperature Calibration Fluid
  • Fluid for Touch Screen Technology

Packaging Specifications

Packaging Specifications
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PM-50 Phenylmethyl Silicone Fluid : Guide

PM‐50 is a low phenyl content fluid with a viscosity of 50cSt @ 25°C. In comparison to conventional PDMS silicone oils, PM‐50 has much higher thermal stability and remains stable at temperatures > 200°C (open system). Unlike the higher phenyl content PM‐125 & PPM‐500, its viscosity remains pourable at low temperatures (low VTC=viscosity‐to‐temperature coefficient), which makes PM‐125 an excellent choice for laboratory baths and heat transfer systems that circulate and pump the fluid at low temperatures.

As a calibration fluid, PM‐50 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 extreme temperatures and high pressures.

PM‐50 Silicone Fluid has a higher RI value (1.425) than conventional PDMS silicone. It an excellent RI index matching fluid and optical fluid for use in sensor /imaging / LED and Photonics technologies that require a higher RI value than conventional fluids.

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