For many years, monopropylene glycol (propylene glycol, MPG) has been the go-to heat transfer fluid for use in food and beverage manufacturing (or where there is a requirement for a non-toxic classification).

Characteristically, propylene glycol-based coolants have a much lower capacity for efficient heat transfer, compared to the better performing, but toxic ethylene glycol mixes. Propylene glycol is also much more viscous than ethylene glycol at low temperatures, providing more of a challenge to pump.

In 2010 Hydratech added Coolflow DTX to their range of process cooling fluids. DTX is a high-performance non-toxic heat transfer fluid that is based on ethylene glycol, blended with a detoxification additive. The game-changing fluid combines the thermal efficiency and low viscosity associated to ethylene glycol (at 14°F the kinematic viscosity of DTX is 50% lower than MPG), with the non-toxic rating of propylene glycol.