120 The internal cooling circuit
Approved coolants
• BASF Glysantin G30
• BASF Glythermin P44
• Clariant Antifrogen N
• Clariant Antifrogen L
• DOW company Dowcal 20
• DOW industrial grade propylene glycol (PGI) with Cortec VpCI-649 corrosion inhibitor
that makes up 0.5% of the total coolant quantity in the circuit
• Nalco Varidos FSK
• Shell Freezeguard OAT -45 °C.
Materials
Materials used in the internal cooling circuit are listed below. Note: These are also the only
materials that can be used in the external cooling circuit.
• stainless steel AISI 316L (UNS 31603)
• heavy gauge aluminum
• plastic materials such as PA, PEX and PTFE
Note: PVC hoses are not suitable for use with antifreeze.
• rubber gasketing NBR (nitrile rubber).
WARNING! If connecting external piping to the internal cooling circuit, use only
materials that are specified above. Copper and brass must not be used under any
circumstances. Even minor dissolution of copper can cause copper precipitation
on aluminum and subsequent galvanic corrosion. The liquid cooling system may not
contain any zinc (eg, galvanized pipes) at all since zinc would react with the inhibitor.
If the system incorporates normal iron pipes or cast iron accessories, a liquid cooling unit
with a heat exchanger must be used to separate the systems.
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