Mobiltherm 605 heat transfer oil is a premium, high quality product intended for use in closed indirect heating installations. It is formulated from highly refined base stocks that are resistant to thermal cracking and chemical oxidation. It has good heat transfer efficiency and the oil viscosity is such that it can be pumped readily at both start-up and operating temperatures. The flash point of this oil will not decrease significantly in service because of its resistance to thermal cracking at the operating temperatures for which it is recommended. Mobiltherm 605 is very thermally stable and is capable of an extremely long service life without deposit formation or viscosity increase. It demonstrates high specific heat and thermal conductivity which provide more rapid heating and greater flexibility in a system.

Mobiltherm 605 heat transfer oil is recommended for use in closed, cold-oil sealed, indirect heating and cooling systems in all kinds of industrial processes operating at bulk oil temperatures up to a maximum of 320ºC and at atmospheric pressure. Mobiltherm 605 can be used in installations where the bulk oil temperature is as high as 320ºC and where minimum shutdown temperatures are not below about -12ºC. If the oil is used above its recommended maximum temperatures, vapour lock may result unless the system is designed to operate at the higher temperature by pressurizing with an inert gas such as nitrogen. However, at higher temperatures, fluid life will be shortened because the rate of thermal degradation increases markedly as temperatures rise above the recommended limit.

In well-designed systems the temperature of the oil film surrounding the heating element should be about 15ºC to 30ºC above the bulk oil temperature. If higher than this, the service life of the oil may be shortened and sludge and coke may be deposited which would interfere with the heat transfer rates. Mobiltherm 605 should not be mixed with conventional oils since this may impair the excellent thermal and oxidation stability of the Mobiltherm 605 oil which may cause a change in other properties and complicate the interpretation of analyses made to determine the oil's useful life.

As with other mineral oils, Mobiltherm 605 heat transfer oil should be used only in systems with forced circulation. Systems that depend on convection for circulation of the heat transfer medium do not provide a rapid enough flow to prevent local overheating and rapid deterioration of the oil. Further, the oil is not recommended for use in open systems where hot oil is exposed directly to the air. If it sprays or escapes from leakage points, hot Mobiltherm 605 may spontaneously ignite.

Typical Properties


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