Propylene glycol is a colorless, odorless, and virtually tasteless liquid widely used in commercial and industrial applications. It is a highly effective heat transfer medium due to its excellent thermal properties, compatibility with water, and ability to perform across a broad temperature range.

While propylene glycol itself provides freeze protection and efficient heat transfer, the performance of a heat transfer fluid is largely determined by its corrosion inhibitor package. These specialized inhibitors protect system components from corrosion and scale buildup, extending equipment life and maintaining peak operating efficiency.

ig-loo® Propylene Glycol Heavy Duty (PGHD) is formulated with 100% virgin propylene glycol and a premium heavy-duty industrial inhibitor package to deliver superior multi-metal corrosion protection and long-term system performance. Color dyes can also be added to assist with leak detection in closed-loop systems.

In addition, ig-loo® Propylene Glycol (PGFG) is acceptable for use as a heat transfer fluid where there is possibility of incidental food contact.  ig-loo® PGFG is registered under NSF Category Code (HT1), for use in water systems in food grade facilities where it may come into incidental or accidental contact in food and beverage processing, and numerous industrial applications due to its versatility and safety profile.

Common Applications

Wineries

​Glycol chillers play a critical role in the wine fermentation process by maintaining precise vessel temperatures throughout fermentation. Typical glycol supply temperatures range from 35°F to 50°F, helping maintain vessel temperatures between 45°F and 60°F, depending on the wine style and winemaker’s specifications.

HVAC Cooling Systems

Propylene glycol is commonly mixed with water in HVAC systems to provide freeze protection and improve system reliability. While water freezes at 32°F (0°C), glycol solutions can lower the freezing point to approximately -60°F, depending on concentration. This protects piping and equipment in cold climates while allowing chilled water systems to operate efficiently at lower temperatures.

Close Loop Glycol Chillers

Closed-loop glycol chillers cool a glycol solution and circulate it through a network of piping to remove heat from connected equipment or processes. These systems provide consistent temperature control while protecting equipment from freezing and corrosion.

Breweries

Breweries rely on glycol chillers to rapidly cool wort after brewing and maintain precise fermentation temperatures. Accurate temperature control is essential for product consistency, yeast performance, and overall beer quality throughout the brewing process.

Hydronic Snow Melting Systems

Hydronic snow melting systems circulate a heated mixture of propylene glycol and water through PEX tubing installed beneath driveways, sidewalks, ramps, and other paved surfaces. The glycol solution prevents freezing while efficiently transferring heat to melt snow and ice, improving safety and reducing maintenance.

Dairy Farms

Glycol chilling systems are used in dairy operations to rapidly cool milk immediately after collection. Fast cooling helps maintain product quality, minimizes bacterial growth, and ensures compliance with food safety standards during storage and transport.

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