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    Thermal Fluids for Sub-Zero Systems

    Water is the best thermal fluid, but it has one major flaw – it does not remain fluid at extreme temperatures.  For systems well-below freezing you need to use a specialty thermal fluid, and Dow Chemical makes the industry standard heat transfer fluids for a range of applications.
     
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Stable Solutions for Sub-Zero Systems 


Extremely cold equipment is required for a wide variety of industrial processes. However, it is incredibly difficult to maintain thermal stability and performance for long-term operation. Corrosion, thermal efficiency losses and system leaks can quickly become an ever-present headache if you don’t use the proper thermal fluid solution.

Dow Chemical has decades worth of experience engineering the peak performance thermal fluids for low temperature applications.  The DOWTHERM™ J, SYLTHERM™ XLT, and SYLTHERM™ HF products deliver best in class thermal properties combined with an incredibly long operational lifetime.

    Key Physical PropertiesDOWTHERM™ JSYLTHERM™ XLTSYLTHERM™ HF
    Freeze Point (°F)
    -120
    -168
    -115
    Boiling Point (°F)
    358
    345
    410
    Flash Point (°F)
    136
    116
    145
    Viscosity (cps at-70°F)
    4.6
    7.6
    10.0
    Viscosity (cps at -100°F)
    8.0
    12.6
    16.7
    Vapor Pressure (psia at 70°F)
    0.015
    0.02
    0.01
     

Sub-Zero Applications & Use 


Dow Thermal fluid solutions provide reliable and long-term operation in some of the most extreme conditions.  From environmental test chambers to large, industrial-scale food freezers and countless others inbetween, the Dow solutions provide best-in-class performance for equipment that demands precise temperature control. 
 
The Dow Thermal Fluids listed on this page are intented for use in a closed, pressurized system under nitrogen blanket with an expansion tank. 

The diagram below shows a simplified secondary cooling loop for processes requiring sustained sub-zero temperatures. 
    
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Dow Thermal Fluid Properties at -50°F

    Thermal Properties (-50°F)DOWTHERM™ JSYLTHERM™ XLTSYLTHERM™ HF
    Thermal Conductivity 
    (Btu/hr ft² °F/ft)
    0.0822
    0.0717
    0.0712
    Density (lb/ft³)
    56.87
    56.28
    58.56
    Specific Heat (Btu/lb °F)
    0.394
    0.354
    0.364
    Viscosity (cP)
    3.3
    5.6
    7.3
    Heat Transfer Coefficient 
    (Btu/hr ft²°F) (7 ft/sec, 1" pipe)
    195
    134
    123
    Pressure Drop (psi/100 ft) 
    11.15
    12.27
    13.44
    Pump Horespower 
    (100' & 70% pump efficiency)
    0.159
    0.175
    0.191

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