Heat Transfer Fluids
Synthetic and Thermal Hot Oils
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Typical Properties of XCELTHERM® MK1*
XCELTHERM® MK1 Engineering Properties
(Viscosity, Density, Specific Heat, Thermal Conductivity, Vapor Pressure)
Material Safety Data Sheet (MSDS)
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Typical Properties of XCELTHERM®MK1*

Key Operating Temperatures
Maximum Bulk Fluid Operating Temperature
  • Liquid Phase
750ºF 400ºC
  • Vapor Phase
750ºF 400ºC
Maximum Film Temperature 800ºF 427ºC
Crystallizing Point 53.6ºF   12ºC
Physical Properties
Composition Stable eutectic mixture of 73% Diphenyl Oxide and 27% Biphenyl
Flash Point (minimum) 255ºF 124ºC
Fire Point (minimum) 265ºF 129ºC
Autoignition Temperature (minimum) 1150ºF 621ºC
Normal Boiling Point @760mm Hg 495ºF 257ºC
Critical Temperature 930.3ºF 499ºC
Critical Pressure 480.3 psia
Critical Volume 0.05153 cu ft/lb
Heat of Fusion 23.3 cal/g
Specific Resistivity 6.4 x 10" ohm-cm @ 68ºF 20ºC
Surface Tension in Air 36.6 dynes/cm @ 77ºF 25ºC
Volume Contraction Upon Freezing 6.30%
Volume Expansion Upon Melting 6.66%
Moisture 300 ppm (maximum)
Density 8.83 pounds per gallon @ 77ºF   25ºC
Specific Gravity 1.044 to 1.066 @ 77ºF   25ºC
Average Molecular Weight 166
* Data represents typical laboratory samples and are not guaranteed for all samples.