Ethylene Glycol Cold Bath Fluid

The usable viscosity range is determined by your bath's stirring or pumping design. Hart baths can be operated using fluids with up to 50 centistokes viscosity. This gives you additional usable range in the lower temperature levels of the fluid.

Some baths advertised as calibration baths require fluids with 10 centistokes or less viscosity to operate properly. The usable ranges in our table on the previous page assume the use of a Hart bath.

In addition to range and viscosity issues, there are a number of other issues to consider when choosing a bath fluid. The other considerations are:

• Thermal characteristics
• Lifetime
• Change in characteristics due to temperature cycling
• Absorption of water from the air
• Vaporization—fumes and fume hood requirements
• Expansion due to heat
• Contamination—mixing oils or introducing contamination with unclean probes
• Conductivity properties
• Effects of using fluids outside of their range—fire, explosion, polymerization
• Effects of altitude on boiling point