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XCELTHERM® MK1

1 of 10 products in this brand
XCELTHERM® MK1 is chemically equivalent to DOWTHERM™ A, recommended for Concentrated Solar Power Systems, PET production, Synthetic Fiber plants and many other applications that require a high temperature heat transfer fluid.

Product Type: Heat Transfer Fluid

Features: High Temperature Performance

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Properties

Appearance
Water-white to straw yellow liquid
Odor
Aromatic
Physical Properties
ValueUnitsTest Method / Conditions
CompositionStable eutectic mixture of 73% Diphenyl Oxide and 27% Biphenyl
Average Molecular Weight166.0g/mol
Density (77ºF/25ºC)8.83lbs/gal
Specific Gravity (25°C/77°F)1.06
Moisture Contentmax. 300ppm
Critical Temperature499.0ºC
Critical Pressure3.31mPa
Critical Density20.4lb/ft³
Critical Volume0.0508ft3/lb
Kinematic Viscosity (104°F/40°C)2.48cSt
Kinematic Viscosity (212°F/100°C)0.99cSt
Coefficient of Thermal Expansion (392°F/200°C)9.341 x 10-4/°C
Heat of Vaporization (Maximum Use Temperature)286.7kJ/kg
Volume Contraction Upon Freezing6.3%
Volume Expansion Upon Melting6.66%
Heat of Fusion97.5kJ/kg
Typical Properties
ValueUnitsTest Method / Conditions
Liquid Phase400.0°C
Vapor Phase400.0°C
Maximum Film Temperature427.0°C
Crystallizing Point12.0°C
Flash Point (PMCC)min. 110ºCASTM D93
Flash Point (COC)(ASTM D92)(min)124.0ºC
Fire Point (ASTM D92)(min)127.0ºC
Autoignition Temperaturemin. 621ºC
Pumpability (300 cSt (mm2/s))min. 13°C
Normal Boiling Point ( 760 mm Hg)257.0°C
Electrical Properties
ValueUnitsTest Method / Conditions
Specific Resistivity (68°F/20°C)6.4 x 10 ohm-cm
Surface Tension in Air (77°F/ 25°C)36.6dynes/cm

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Certifications & Compliance