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Dimethyl Silicone Oil

Low Viscosity Pure Silicone Fluids

Chemical Name:Polydimethylsiloxane Fluid / PDMS Silicone Oil
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

Low Viscosity Pure Silicone Fluids

Low Viscosity Pure Silicone Fluids are clear, colorless, and odorless linear Polydimethylsiloxane fluids / PDMS Silicone Oils that range in viscosities from 5cSt to 20cSt (centistokes) @ 25°C.
They are characterized by their low pour points, low surface tensions, low viscosity change at temperature (low VTC), excellent lubricity, high dielectric strength, RI Values between 1.3970 to 1.4000, wide service temperature range and inertness to virtually all substrates.

Specific Gravity0.9180.8180.853
Pour Point-90°C-70°C-65°C
Flash Point135°C163°C232°C
Refractive Index1.39701.39901.4000
Thermal Expansion cc/cc °C0.001090.001080.00107
Thermal Conductivity g/cal/cm/sec °C0.000280.000320.00034


  • Low viscosity PDMS Silicone Oils…viscosities slightly higher than water
  • Low pour points (as low as -90°C)
  • Wide Service Temperature Range
  • Low surface tension fluids (high spreadability)
  • Low viscosity change at temperature (low VTC)
  • RI Values between 1.3970 to 1.400
  • High Dielectric Strength
  • Newtonian behavior under shear
  • Excellent Lubricity
  • California VOC Exempt…replacement for petroleum based solvents that are not VOC Compliant

Applications Include:

  • Laboratory Bath Fluids
  • Heat Transfer Fluids
  • Dielectric Fluids
  • Low Viscosity Damping Fluids
  • ORC Turbo Generator Fluids
  • Low Viscosity Hydraulic Fluids
  • Refractive Index Matching Fluids
  • RI Matching Fluids for LED and Optics
  • Low Dielectric Constant Fluids for Photonics
  • VOC Exempt Fluids for Renewable Energies
  • Lubricants for Plastic Parts
  • Lubricants for Rubber Parts

Packaging Specifications

Packaging Specifications
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Polydimethylsiloxane Fluid : Guide

Low Viscosity Silicone Fluids are widely used as laboratory bath fluids / heat transfer fluids due to their low viscosity, low pour points, low viscosity change at temperature and high dielectric strength. They are particularly effective for baths and systems that have to circulate. Unlike higher viscosity fluids, their viscosities remain low even at extremely low temps. As such, they are easy to circulate and pump…

The low molecular weight and refractive index values of Low Viscosity Pure Silicone Fluids make them widely used in Optics research, LED technologies & Sensor technologies.

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