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Heat Transfer Oil Specifications
ISO Grade 68 Heat transfer Oil Specification
There are many different types of Heat Transfer Oils on the international marketplace. It is
critical that you use the proper oil to prevent poor performance, oil flashing, or auto-ignition.
To conform to most government bids and to supply a readily available product, CIMLINE
typically uses brands manufactured by Conoco or Phillips 66 that meet the ISO Grade 68
Heat Transfer Oil specifications listed. To insure maximum safety and performance, we
recommend you purchase your oil through CIMLINE.
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IMPORTANT NOTICE!!
The ISO Grade is just a viscosity index (ability to flow/thickness). An ISO Grade 68 oil can
be an engine oil, hydraulic oil, etc. The manufacturer uses different additives to make the
oil conform to different applications. YOU MUST CLARIFY with the supplier that the oil is
to be used in a heat transfer system to avoid any potential problems. Oil is also available
from CIMLINE in 5 and 30 Gallon containers for ship-out.
NOTE: CIMLINE Melter/Applicators include and expansion tank that cools the oil that is
exposed to the outside air. When the oil heats up and expands, it flows into the expansion
tank. The tank is cooler since it is not oil jacketed and is surrounded by outside airflow.
The only exposure the hot oil has to the atmosphere is through a 3/4" vent/overflow pipe.
This is done so the oil in the tank can run higher than the flash point. Only the lower tem-
perature oil fumes are exposed to the atmosphere.
FLASH POINT - Test in which an open container of oil can heated until an open flame will
flash when passed over the fumes.
FIRE POINT - Same test as the flash point except the oil is heated until the gasses will
start a fire.
AUTO IGNITION POINT - The point at which fumes will burst into flame when exposed to
air.
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