Propylene glycol is used in cooling systems.
Undiluted its freezing point is -50°C.
Propylene glycol can be diluted with water:
- 50% propylene glycol: freezing point: -35°C
- 40% propylene glycol: freezing point: -22°C
- 30% propylene glycol: freezing point: -13°C
- 20% propylene glycol: freezing point: -8°C