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Dimethyl Silicone Oil

Wide Temperature Dielectric Silicone Fluids

Chemical Name:Linear Polydimethylsiloxane (Dimethylpolysiloxane or PDMS)
Product Category:Silicone FluidsProducts
Structural Formula:silicone-oil-63148-62-9-_11_65_b_116566
CAS No.:CAS No. 63148-62-9
Molecular Formula:C6H18OSi2
Molecular Weight:162.38 g/mol

Wide Temperature Dielectric Silicone Fluids

Wide Temperature Dielectric Silicone Fluids (-50°C to 230°C) are clear, colorless and odorless linear Polydimethylsiloxane fluids (CAS# 63148-62-9). They are characterized by their dielectric strength, high flash points, high thermal stability, high resistance to oxidation, low vapor pressure, and compatibility with virtually all surfaces including metal, rubbers and plastics.

Product Offsets: Dow Corning 200® fluid, 20cs Xiameter® PMX-200, 20cs, Xiameter PMX-200, 50cs, Xiameter® PMX-200, 100cs, Dow Corning 200® fluid, 50cs, Dow Corning 200® fluid, 100cs, Momentive SF96-20, Momentive SF95-50, Momentive SF96-100, GE SF96-20, GE SF96-50, GE SF96-100, Momentive Element 14® PDMS 20, Momentive Element 14® PDMS 50, Momentive Element 14® PDMS 100, Rhodorsil® 47 V 50, Rhodorsil® 47 V 100

Wide Temperature Dielectric Silicone Fluids are 100% linear Polydimethylsiloxane fluids (CAS# 63148-62-9) that are formulated for use as dielectric fluids and dielectric coolants in a wide range of applications. The fluids are clear, colorless, odorless, and inert to virtually all metals, plastics and rubbers.

Wide Temperature Dielectric Silicone Fluids encompass a viscosity range from 20cSt to 100cSt (measures @ 25°C). They are characterized by their high dielectric strength, high flash points, wide service temperature range, low pour points, high resistance to oxidation, low viscosity change at temperature (low V.T.C.), long service life, and hydrophobic nature (insoluble in water). If you require a fluid that is formulated to contain <50ppm water content and meets IEC 836 specifications, please see STO-50 Dielectric Silicone Fluid/ Silicone Transformer Oil.

Product Data:

Chemical namePolydimethylsiloxanePolydimethylsiloxanePolydimethylsiloxane
CAS #63148-62-963148-62-963148-62-9
Appearanceclear, colorlessclear, colorlessclear, colorless
Viscosity @ 25°C20cSt50cSt100cSt
Soluble in waternonono
Pour point-60°C-55°C-55°C
Flash point232°C285°C315°C
Boling point>200°C>250°C>250°C
Vapor pressure @ 25°C<1mmHg<1mmHg<1mmHg
Specific heat @ 25°C J/g °C1.71.51.5
Thermal expansion cc/cc/°C0.001070.001060.00096
Thermal conductivity g/cal/cm/sec °C0.000340.000360.00037
Service temperature-50°C to 220°C-40°C to 230°C-40°C to 230°C


  • Clear, colorless, odorless fluids & inert fluids
  • Long service life @ recommended service temperatures
  • Low viscosity: will not put strain on pumps.
  • Low pour points: as low as -60°C
  • Thermal conductivity: 0.00034 to 0.00037 g/cal/cm/sec &176;C
  • Specific heat value: 0.36 cal/g &176;C
  • Excellent low temperature stability with little viscosity increase (low VTC)
  • Exhibit significantly less viscosity change than petroleum based oils.
  • Formulated from 100% synthetic sources.
  • Long service life when used for recommended temperature ranges.
  • Inert to virtually all bath instrumentation and plastics
  • Environmentally friendly: VOC Exempt & HAP Free
  • Hydrophobic- will not absorb water.

Packaging Specifications

Packaging Specifications
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Wide Temperature Dielectric Silicone Fluids : Guide

Wide Temperature Dielectric Silicone Fluids have a high Dielectric Strength of 375 to 400 volts/mil.

Wide Temperature Dielectric Silicone Fluids have Thermal Conductivity values between 0.00034 to 0.00037 g/cal/cm/sec °C or 0.15 to 0.16 W/m °C. The Specific Heat values are 0.36 cal/g °C and 1.6 to 1.5 J/g °C .

Wide Temperature Dielectric Silicone Fluids have low Viscosity-Temperature Coefficients (V.T.C.), and will experience little viscosity increase even at extremely low temperatures. For systems that have to operate at extremely low temps, the fluids will still circulate and provide a consistent temperature.

If you require a dielectric fluid with a different viscosity, we offer the Pure Silicone Fluids which range in viscosity from 0.65cSt to 20,000,000cSt.

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