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PSF‐2cSt Silicone Heat Transfer Fluid Operating Temperature Range: ‐80°C to 150°C closed system only Features ? Super low viscosity: provides excellent low temperature pump‐ability ? Clear, colorless and odorless fluid   ? Low Temperature heat transfer fluid ? Insoluble in water ? Compatible with virtually all o‐rings, gaskets, valves and seals * Product Information PSF‐2cSt Silicone Heat Transfer Fluid is a clear, colorless and odorless low‐viscosity linear Polydimethylsiloxane that is formulated as a cold and heat transfer medium in a wide range of applications. PSF‐2cSt Silicone Heat Transfer Fluid has an operating service temperature range of – 80oC to 150oC (closed system*).    PSF‐2cSt Silicone Heat Transfer Fluid is characterized by its low pour points, low temperature stability, wide service temperature range, low viscosity change at temperature (low V.T.C.), low surface tension, long service life, and hydrophobic nature (insoluble in water).  It is widely used in Freeze Drying/Lyophilization applications. PSF‐2cSt Silicone Heat Transfer Fluid has a Thermal Conductivity value of 0.00026 g cal/cm?sec? °C.   Its specific heat value is 0.410 cal/g/°C @ 25°C.    PSF‐2cSt Silicone Heat Transfer Fluid has a low viscosity‐temperature coefficient or VTC (viscosity @99°C ÷viscosity @ 38°C).  The lower the VTC, the lower the viscosity at lower temps.  Thus, its viscosity will not increase significantly even at extremely low temperatures.  For example, at –60°C, the viscosity of PSF‐2cSt is <20cSt.    This is critical for systems that    cannot operate with higher viscosity fluids.