MOL Thermol 46

heat transfer oil

MOL Thermol 46 is a mineral oil based heat transfer oil having high viscosity index and narrow boiling point range. The allowed maximum film temperature at the heat transfer surface is 350 °C, and in the system it is 330 °C. The service life of the heat transfer medium depends greatly on the design of the heat transfer system and on the operating conditions. The service life could be up to 5 years, if the system is designed properly, and when it is protected from extreme load conditions. The service life could be extended significantly if low pressure (1.2 - 1.5 bar gage pressure) inert gas atmosphere (nitrogen) is used in an expansion tank. For safety and economic reasons, it is recommended to check the condition of the oil on a regular basis, but once a year at least. Handling MOL Thermol 46 is safer than when handling most other synthetic oils, as it is not toxic and has a low vapour pressure. It can be collected as used oil after its application, for recycling or disposal. The physical properties considered to be important in terms of heat transfer are collected in a separate table, as a function of the temperature.


  • Closed circuit heat transfer systems with indirect heating and forced circulation
Product featuresBenefits
Excellent thermal stability
  • Resists thermal decomposition and deposit formation in the long term, even at high operating temperatures
  • Extended trouble-free operation, so less downtime
  • Low maintenance cost
Long oil lifetime
  • Oil change and reconditioning costs can be reduced significantly
Excellent thermal properties
  • Effective heat transfer between surfaces
  • Improved efficiency, giving reduced operational costs
Good corrosion protection
  • Long-term protection of steel and non-ferrous metal parts
Compatible with usual seal materials
  • Usual heat and oil resistant seal materials can be used
  • Lower possibility of contaminant ingression and oil leaks
Simple disposal
  • Low cost
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Data sheets

Performance levels, approvals

DIN 51522 Q

Typical properties

Density at 15°C [g/cm3]0,876
Kinematic viscosity at 40°C [mm2/s]43,6
Viscosity index98
Pour point [°C]-15
Pourpoint [°C]-15
Flash point (Cleveland) [°C]232
Conradson carbon residue [mass %]0,02


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