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Technical Data Sheet
MARLOTHERM® XC Heat Transfer Fluid

Product Description
Marlotherm XC is a high performance, synthetic organic heat transfer fluid designed especially for use in the liquid phase in closed heat transfer systems with forced circulation. Considering its superior physical and thermal properties, Marlotherm XC is very well suited for heat transfer processes that require excellent heating and/or cooling performance throughout its recommended temperature range.

Typical Properties

PropertyTest MethodTypical Value, Units
Dielectric Constant 
     @ 20°C (68°F) 2.38
Moisture Content, maximumASTM E-203<300 ppm
Copper CorrosionASTM D 1301 A
Liquid Density 
     @ 25°C (77°F)ASTM D 4052857 kg/m3 (7.15 lb/gal)
Pseudocritical density 280 kg/m3 (17.5 lb/ft3)
Pseudocritical pressure 32.1 bar (465 psia)
Pseudocritical temperature 358 °C (676 °F)
Molecular Weight (Average) 120
Viscosity, Kinematic 
     @ 40°C (104°F)ASTM D 4450.779 mm2/s
     @ 100°C (212°F)ASTM D 4450.463 mm2/s
Coefficient of thermal expansion 
     @ 200°C (392°F) 0.00159 /°C (0.000882 /°F)
Heat of Vaporization 
     @ 300°C (572°F) 144 kJ/kg (62.0 Btu/lb)
Minimum liquid temperatures for fully developed turbulent flow (NRe > 10000) 
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) <-90 °C (<-130 °F)
     10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) -84 °C (-119 °F)
Pour PointISO 3016<-90 °C (<-130 °F)
Autoignition TemperatureDIN 51794~420 °C (~788 °F)
 ASTM E659441 °C (826 °F)
Fire Point 
     COCASTM D9250 °C (122 °F)
Flash Point 
     CCASTM D9338.8 °C (102 °F)
     @ 300mm2/s (cSt) <-90 °C (<-130 °F)
Normal Boiling Point 152 °C (306 °F)
Maximum film temperature 320 °C (608 °F)
Recommended Bulk Temperature 300 °C (570 °F)
Composition Cumene
Appearance Clear liquid

Properties reported here are typical of average lots. Eastman makes no representation that the material in any particular shipment will conform exactly to the values given.

Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.

8/6/2020 4:24:48 AM