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    • Marlotherm® LH: synthetic organic heat transfer medium

    Marlotherm® LH is a low-viscosity, synthetic organic heat transfer medium designed for use in both liquid and vapor phases within closed, forced-circulation heat transfer systems. Known for its thermal stability, Marlotherm® LH delivers reliable and consistent performance at temperatures up to 330°C over a long period of time. It is recommended that Marlotherm® LH be blanketed with an atmosphere of inert gas to protect against the effects of fluid oxidation on its performance and life expectancy.

    Temperature range

    -30° to 330°C

    Recommended bulk temp °C

    330

    Max. extended bulk temp °C

    360

    Max. film temp °C

    380

    Boiling point °C @ 1013 mbar

    278

    Pumpability °C @ 300 mm²/s (cSt)

    -67

    Pour Point °C

    -79

    Flash Point °C (ASTM D92)

    132

    Autoignition Temp °C (DIN 51794)

    510

    Autoignition Temp °C (ASTM E-659)

    473

    Density @ 20°C (kg/m³)

    996

    Kinematic viscosity @ 40°C (mm²/s)

    2,73

    Water Class

    WGK 3

    The benefits of Marlotherm® LH for your heat transfer system:

    For enhanced thermal stability and protection to maximize the lifespan and performance of Marlotherm® LH, it is recommended to blanket the system with an inert gas atmosphere. This precautionary measure protects the fluid against oxidation, further extending its life expectancy and maintaining optimal performance.  

    Why choose Marlotherm® LH for your heat transfer systems?

    • superior thermal stability – performs reliably at high temperatures, up to 330°C

    • long-term efficiency – offers consistent performance over an extended period

    • oxidation protection – recommended inert gas blanketing safeguards against fluid degradation

    Discover a wide range of the most common applications for Marlotherm® LH:

    • plastics and polymer manufacturing 

    • plastic molding

    • specialty chemical manufacturing 

    • chemical manufacturing

    • Organic Rankine Cycle (ORC)

    • biofuel manufacturing

    • desalination