Specially selected highly refined mineral oil which exhibits good oxidation stability, low carbon and sludge forming characteristics, combined with high specific heat and thermal conductivity properties. Fuchs 610T HEAT TRANSFER OIL is suitable for use in the liquid phase in closed heat transfer systems with forced circulation. Optimally suited for use in the indirect heating of reactors, polymerisation and distillation systems, processing machines and dryers, as well as heat exchangers in processing systems for heat recovery. 610T HEAT TRANSFER OIL is best used between temperatures of 200C to 300C. The maximum film temperature should not exceed 340C at heat exchange surfaces.