Skip to content

Solar & geothermal

The natural choice in glycols

When it comes to harnessing the power of the sun and earth, why fill your system with an underperforming, petroleum-based heat-transfer fluid? Susterra® propanediol offers a higher-performing, bio-based alternative to propylene glycol for solar and geothermal heat-transfer fluids.

Susterra® propanediol (1,3-propanediol) and propylene glycol (1,2-propanediol) have exactly the same chemical formula, but slightly different structures. This structural difference gives Susterra® propanediol enhanced thermal stability, decreasing fluid degradation and system corrosion and improving the efficiency of high-heat applications such as solar and geothermal process heating. Plus, every drop of our pure, bio-based glycol is renewably sourced from plant materials, not petroleum—so you can feel good about every drop you use.

The benefits of Susterra® propanediol include:

  • Exceptional degradation properties compared to propylene glycol and ethylene glycol for process-heating applications where stagnation may occur under extreme temperatures
  • Higher boiling point versus propylene glycol and ethylene glycol-based heat-transfer fluids
  • 100% USDA bio-based material, renewably and sustainably sourced
  • Safe, low-toxic and readily biodegradable
  • LEED points eligible

Where to buy

Find a distributor in your area.

Request a sample

Product formulators and designers are invited to request a sample for application testing.