Typical Properties By Concentration

Heat Transfer Fluid FAQ’s

Propylene Glycol vs. Ethylene Glycol? What’s the difference?

Propylene glycol is less toxic than Ethylene Glycol. It does not perform as well in colder temperatures, unlike Ethylene Glycol. Propylene Glycol has a slightly higher viscosity and a slightly lower heat transfer efficiency. It is also colorless, odorless and water soluble.

What are the optimal properties to look for in a heat transfer fluid?

A heat transfer fluid should have the following properties: high thermal stability, a high degree of material compatibility, a high level of environmental compatibility, high thermal conductivity, high specific heat, low freezing point, low viscosity, and low vapor pressure.

Heavy duty vs. Regular duty? What’s the difference?

When temperatures exceed 250°F continuously or intermittently for a significant portion of time then Heavy Duty formulated products should be used. When an application operates between -60°F and 250°F then Regular Duty products should be used.

What are some of the most used applications for Heavy duty and Regular duty products?

Heavy Duty includes - solar heating systems, asphalt melting operations, high-temperature plastic injection molding plants, steel mills, paper process and pulp plants, chemical process plants, refinery heating and cooling, natural gas line heaters and large stationary engines.

Regular Duty includes - Food processing and storage facilities, sidewalk de-icing, ice skating rinks, process cooling, residential housing, hotels and resorts, apartment buildings, hospitals, school and universities, and office buildings.

What product do you recommend that can be used where minimal contact with food or beverage is possible?

We recommend our Truegard Hale-Guard 960 and Truegard Hale-Guard 905/50/50. Click here to view full product details.

What is the Shelf Life of Truegard Hale-Guard 960?

The shelf life is up to two years if stored between 65°F and 75°F. Recertification will be needed to confirm suitability after six months for up to a year if stored in the original sealed package.

What is the minimum recommended dilution?

Keller-Heart recommends a dilution no lower than 30%.

What is your water specification if I need to dilute the concentrate?

Keller-Heartt recommends using de-ionized water. We do not recommend well or tap water for dilution because it has too much scale that reduces the Heat Transfer properties.

Are you using recycled or virgin raw materials?

Keller-Heartt Oil only uses the highest quality virgin raw materials in our products. Recycled glycol may be at risk for containing impurities that could contaminate your systems.

What are your concentration recommendations based on freeze protection?

Please contact a Keller-Heartt representative for your specific application, for suggested freeze protection.

Do you offer used glycol environmental haul away services?

Keller-Heartt can recommend an environmental disposal company for national locations for disposal of used glycol.

How can I tell if the glycol in an existing system is still within specifications?

By utilizing Keller-Heartt’s Fluid Care Program

Propylene glycol is a synthetic liquid substance that absorbs water. Propylene glycol is also used to make polyester compounds and as a base for de-icing solutions. Propylene glycol is used by the chemical, food, and pharmaceutical industries as an antifreeze when leakage might lead to contact with food. The Food and Drug Administration (FDA) has classified propylene glycol as an additive that is generally recognized as safe for use in food. Propylene glycol from Keller Heartt is food safe and certain varieties can also be certified Kosher.

It is used to absorb extra water and maintain moisture in certain medicines, cosmetics, or food products. It is a solvent for food colors and flavors and in the paint and plastics industries. Propylene glycol is also used to create artificial smoke or fog used in fire-fighting training and in theatrical productions. Propylene glycol is clear, colorless, slightly syrupy liquid at room temperature. It may exist in air in the vapor form, although propylene glycol must be heated or briskly shaken to produce a vapor. Propylene glycol is practically odorless and tasteless.

Whether your company is in the cosmetics, food service, or theatre industries you will find we carry the products your business needs. We currently offer inexpensive and efficient TRUEGARD Propylene glycol in 55-gallon drums for projects of all sizes.