- Corrosive
- All salts are very corrosive
- Long term protection is impossible even with corrosion inhibitors
- Glycols (without corrosion inhibitors) are corrosive to most metals
- Oxidize to form acids --> low pH --> acidic pH is corrosive
- Must use correct type of corrosion inhibitor technology
- Corrosion damage can occur in less than 2 years
- Worse for high temperatures and high exposure to air or dissolved O2
- Passivate metal surfaces to prevent corrosion
- Neutralize degradation compounds to prevent pH drop
- Thermoxidatively stable to provide long term protection