Solar Heat-Transfer Fluid | Geothermal Heat-Transfer Fluid | Susterra®

DuPont Tate and Lyle Bio Products

DuPont Tate & Lyle Zemea Propanediol Zemea USP Susterra Propanediol

Solar and Geothermal Heat-Transfer


Susterra® Propanediol for Solar and Geothermal Heat-Transfer Fluids


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.

Now there is choice.

View a list of our heat-transfer fluid suppliers.

Susterra® propanediol benefits 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