Hydrite Chemical Co.

Specialty-inhibited propylene glycol


Specialty-Inhibited Propylene Glycol


What is Inhibited Propylene Glycol?

Inhibited propylene glycol, also known as PG, is commonly used as a heat transfer fluid in various applications, including HVAC systems, food and beverage processing, pharmaceuticals, oil and gas, and industrial processes. By maintaining proper heat transfer efficiency, it helps prevent overheating, equipment malfunctions, and system failures. Inhibited propylene glycol contains corrosion inhibitors that help protect the metal surfaces within a system from corrosion. Corrosion can lead to equipment damage, reduced efficiency, and system failures. The inhibitors in propylene glycol help extend the useful life of the fluid by reducing the degradation caused by oxidation and thermal breakdown. This ensures that the fluid can continue to perform its intended functions over an extended period. 


Water Cooling Tower



common uses for Inhibited Propylene Glycol

Inhibited propylene glycol is used in applications such as:

  • Food & Beverage
  • Cooling Towers
  • Process Cooling & Heating
  • Refrigeration Systems
  • Ice & Snow Melting Systems
  • Line Heaters
  • Winterization


Hydrite Hydri-Chill™ Specialty-Inhibited Propylene Glycol


Hydrite Hydri-Chill™ is a specialty-inhibited propylene glycol which contains a food grade inhibitor and can be applied where incidental contact with food or beverage products may occur. Hydri-Chill is acceptable for use as a heat transfer fluid with food processing equipment where there is possibility of food contact. Can be used in secondary cooling and heating, deicing, defrosting, dehumidifying, and winterizing pipes.


Hydri-Chill Formulations

Hydrite Hydri-Chill inhibited propylene glycol is available in several variations for optimal performance.*

Hydri-Chill FG

Food grade inhibited propylene glycol

Hydri-Chill FG 50%

Food grade inhibited propylene glycol 50% solution in deionized water

Hydri-Chill FG Red

Food grade inhibited propylene glycol with a red tracer dye

Hydri-Chill benefits

Check markFood Grade

red check markLow Oral Toxicity

red check markSuperior Corrosion Protection

red check markLow Environmental Toxicity

red check markRecommended Use at Temperatures -50 to 250°F

red check markSubstances Generally Recognized as Safe (GRAS)

*Custom inhibitor packages and other dilutions available. Contact Us for more information.




Comparative Analysis: Hydri-Chill vs. Uninhibited Propylene Glycol


Outfitting a glycol system with Hydri-Chill provides superior corrosion resistance compared to conventional uninhibited propylene glycol solutions. Comparative laboratory testing completed to evaluate the effectiveness of Hydri-Chill at 50% (Figure 1) versus an un-inhibited 50% propylene glycol solution (Figure 2).

Hydri-Chill comparison to uninhibited propylene glycol

By using inhibited propylene glycol, system operators can enhance the overall reliability of their equipment and reduce the likelihood of unexpected failures or downtime. The corrosion protection and extended fluid life provided by inhibited propylene glycol contribute to the smooth operation of systems, leading to increased efficiency and longevity.

process heating and cooling


Contact Us

Hydrite’s dedicated technical support staff is knowledgeable and experienced.

We can help calculate and maintain your glycol concentration.

Contact Us Today


17385 Golf Parkway
Brookfield, Wisconsin 53045
262-792-8721 Fax

© 2024 Hydrite Chemical - all rights reserved.