Click for PDF
Technical Data Sheet
MARLOTHERM® LH Heat Transfer Fluid

Product Description
Marlotherm LH is a low-viscosity, synthetic organic heat transfer medium for use in both the liquid and vapor phase for closed, forced-circulation heat transfer systems. Marlotherm LH offers outstanding performance and thermal stability at 330°C, which results in reliable, consistent performance over a long period of time. Marlotherm LH is recommended to be blanketed with an atmosphere of inert gas to protect against the effects of fluid oxidation on its performance and life expectancy.

Typical Properties

PropertyTest MethodTypical Value, Units
Appearance Liquid, clear
Composition Benzyltoluene
Recommended Bulk Temperature 330 °C (625 °F)
Extended maximum use temperature 360 °C (680 °F)
Maximum film temperature 380 °C (715 °F)
Normal Boiling Point 278 °C (532 °F)
     @ 300mm2/s (cSt) -67 °C (-88 °F)
     @ 2000 mm2/s (cSt) <-70 °C (<-94 °F)
Flash Point 
     COCASTM D92132 °C (270 °F)
Autoignition TemperatureASTM E659473 °C (883 °F)
 DIN 51794510 °C (950 °F)
Pour PointASTM D 97-79 °C (-110 °F)
Minimum liquid temperatures for fully developed turbulent flow (NRe > 10000) 
     10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) 1 °C (34 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) -17 °C (1.4 °F)
Minimum liquid temperatures for transitional region flow, (NRe > 2000) 
     10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) -37 °C (-35 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) -48 °C (-54 °F)
Heat of Vaporization 
     @ 360°C 259 kJ/kg (111 Btu/lb)
Coefficient of thermal expansion 
     @ 200°C 0.000981 /°C (0.000545 /°F)
Viscosity, Kinematic 
     @ 40°CASTM D 4452.78 mm2/s
     @ 100°CASTM D 4451.08 mm2/s
Molecular Weight (Average) 182.3
Pseudocritical temperature 499 °C (930 °F)
Pseudocritical pressure 35.2 bar (510 psia)
Pseudocritical density 336.7 kg/m3 (21.02 lb/ft3)
Liquid Density 
     @ 25°CASTM D 4052992 kg/m3 (8.28 lb/gal)
Copper CorrosionASTM D 1301a
Moisture Content, maximumASTM E-203300 ppm
Dielectric Constant 
     @ 23°CASTM D-9242.7

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.

8/26/2020 4:57:52 AM