General Operation
Heat Transfer Fluid 8
8-9
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Figure 8-1. Chart of Various Bath Fluids and Their Properties
Pour Point: This represents a handling limit for the fluid.
Viscosity: Points shown are at 50 and 10 centistokes viscosity. When viscosity is greater
than 50 centistokes stirring is very poor and the fluid is unsatisfactory for bath
applications. Optimum stirring generally occurs at 10 centistokes and below.
Fume Point: Indicates the point at which a fume hood or ventilation system must be used
to prevent health hazards posed by fume vapors. In the graph, it is assumed that the bath
access hole is covered at this point. This is subject to user's company policy. Fluke
recommends the use of a ventilation system as soon as the fluid produces vapors. Keep
the access hole covered to reduce evaporation.
Flash Point: The point at which ignition may occur. The point shown may be either the
open or closed cup flash point. Refer to the flash point discussion in Safety in Chapter 8.
Boiling Point: At or near the boiling point of the fluid the temperature stability is
difficult to maintain. Fuming or evaporation is excessive. Large amounts of heater power
may be required to maintain the temperature because of the heat of vaporization.
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