Antifreeze concentrations for potential sub-zero conditions.

[smart1123]

Hi All, I have a CNC router with a 2.2kw HY (Chinese) water cooled spindle. The room it is in is electrically heated but in the winter we have pretty frequent power outages combined with frequent -10 to -20 celcius temps.

I am wondering if putting straight antifreeze in my cooling system has potential to damage the spindle? Is 30% enough to stop the coolant freezing in the spindle at -20 or -25 celsius (-13F)?

Thanks

Luke

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[Jim Dawson]

Normally the antifreeze mix for maximum protection is 50/50. A 50/50 mix has a lower freezing point than straight antifreeze, somewhere around -35° C

[smart1123]

Thanks!