Hypertherm HPR260 Manual Gas Preventive Maintenance Program Rev.5 - Manual (Page 88)

INSTALLATION
HPR260 Auto Gas Instruction Manual 3-39
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-7
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T
e
mperature
% of Propylene Glycol
Caution: For operating temperatures colder than the temperature stated above,
the percentage of propylene glycol must be increased. Failure to do so
could result in a cracked torch head, hoses or other damage to the torch
coolant system due to freezing.
Hypertherm pre-mix (028872)
Maximum glycol percentage
°F °C
Coolant for cold operating temperatures (below 0° C / 32° F)
Use a custom coolant mix when operating in temperatures below 0° C (32° F).
Use the chart below to determine what percentage of propylene glycol to use in the mixture.
Mix 100% glycol (028873) with the premixed Hypertherm coolant (028872) to increase the percentage of glycol. The
100% glycol solution can also be mixed with purified water (see next page for water purity requirements) to achieve the
required protection from freezing.
Note: Maximum percentage of glycol should never exceed 50%.