3.6 Mixing Glycol and Water
If possible, it is recommended to purchase the antifreeze solution already pre-mixed by the
manufacturer. If this is not the case, always pre-mix the glycol and water prior to adding to the
system. The chemical reaction between the two will release oxygen. Oxygen is extremely
undesirable in a closed loop system.
NOTICE: Risk of using the wrong type of glycol. Can cause piping
damage, coolant fluid leaks, and catastrophic and expensive building and
equipment damage.
Do not use automotive antifreeze as it contains chemicals that can
damage the piping system.
Typical inhibited formula ethylene glycol and propylene glycol are
supplied with corrosion inhibitors and do not contain a silicone anti-leak
formula. Commercial ethylene glycol and propylene glycol, when pure,
are generally less corrosive to the common metals of construction than
water itself. Aqueous solutions of these glycols, however, assume the
corrosivity of the water from which they are prepared and may become
increasingly corrosive with use when not properly inhibited.
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