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Dimethyl Silicone Oil

Super High Viscosity Pure Silicone Fluids

Chemical Name:Polydimethylsiloxane Fluid / PDMS Silicone Oil
Product Category:Pure Silicone Fluids  – Silicone Fluids
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

Super High Viscosity Pure Silicone Fluids​

Super-High Viscosity Pure Silicone Fluids are clear, colorless and odorless linear Polydimethylsiloxane oils (Polydimethylsiloxanes) that range in viscosities from 300,000cSt, 600,000cSt, 1 million cSt, 2,500,000cSt (2.5 million cSt) & 20,000,000cSt (20 million cSt).

Specific Gravity0.9770.9780.9780.9780.979
Refractive Index1.40351.40351.40351.40351.4035
Pour Point-41°C-41°C-39°C-38C-35°C
Viscosity / Temp Coefficient0.610.610.620.620.62
Flash Point321°C321°C321°C321°C321°C
Thermal Expansion cc/cc °C0.000920.000920.000920.000920.00092
Molecular Weight204,000260,000308,000423,000>500,000


  • Clear, colorless, odorless fluids
  • Extremely High Viscosities
  • Non-Flammable
  • High Damping action
  • High Temperature Stability
  • Little viscosity change at temperature
  • Inert to virtually all o-rings, gaskets, seals and valves *
  • Excellent lubrication
  • High oxidation resistance
  • High dielectric strength
  • High water repellency
  • High Shear resistance
  • Meet Mil Spec VV-D-1078
  • VOC Exempt
  • High molecular weight

Packaging Specifications

Packaging Specifications
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Super High Viscosity Pure Silicone Fluids : Guide

Super Hi-Vis Silicone Fluids are characterized by their high damping action, extremely high viscosities, high molecular weight, excellent lubricity, inertness to plastics, rubbers and metals, high dielectric strength, high resistance to shear, thermal stability, wide service temperature range and low viscosity change at temperature.

Clearco High Viscosity Pure Silicone Fluids meet Federal Specification VV-D-1078 “Silicone as Damping Fluid”. They are used in a wide range of military, industrial and avionic gauges, meters, instruments, and monitoring systems, and o-ring, gasket, valve and seal lubricants. In addition, they are used to coat and lubricate a wide range of o-rings, gaskets, valves and seals…

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