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Simplify the Switch to Listed Antifreeze

Fire protection contractors are on the front lines of defense for keeping people safe from fires. That’s why NFPA standards specify factory premixed, listed antifreeze for fire sprinkler systems. This investment in life-safety is a necessity, but it doesn’t have to be complicated. In fact, switching to a listed antifreeze has never been easier. You’re in the right place to learn everything you need to know about listed antifreeze, why UL-listed freezemaster™ antifreeze is the superior choice, and the basics of a successful installation. 

freezemaster volume calculator
freezemaster NFPA Compliance

NFPA Compliance

In the last decade, a number of high-profile fires were significantly worsened by the unlisted freeze-protection fluids in fire sprinkler systems, resulting in injuries and deaths. To better protect lives, NFPA issued new guidelines specifying factory-premixed, UL-listed antifreeze. Unlike unlisted fluids, factory-premixed antifreeze will always have the correct formulation and will avoid the explosive potential of an unlisted mixture.

New and existing antifreeze fire sprinkler systems must function so that the antifreeze in the system does not dilute. This may require some rework of existing systems like adding an expansion tank tank per NFPA 13 guidelines. At the very least, all antifreeze fire sprinkler systems must switch to a UL-listed antifreeze by September 30, 2022, to meet the NFPA 25 deadline. Don’t wait until the deadline to switch!


freezemaster Antifreeze

Why freezemaster Antifreeze?

As the listed antifreeze market grows, freezemaster™ antifreeze has become the most popular product for many reasons. Beyond superior fire sprinkler system freeze protection, here’s why so many installers are choosing freezemaster™ antifreeze.


freezemaster™ antifreeze is colored blue for easy visual identification

While some other listed antifreeze products and unlisted fluids are clear, freezemaster™ antifreeze’s blue color lets you see the material as it exits the drains when flushing and filling the system during antifreeze installation and maintenance. You can literally see the freezemaster™ antifreeze advantage!


freezemaster™ antifreeze has the highest volume allowance of any listed antifreeze product

Different antifreeze products have unique volume restriction listings, and when it comes to Ordinary Hazard 1 and 2 listings, most are approved for only 40 gallons. With many systems far exceeding this limit, the choice is to valve off the system every 40 gallons to be compliant. freezemaster™ antifreeze eliminates this tedious process. Only freezemaster™ antifreeze is UL-listed for Ordinary Hazard 1 & 2 systems up to 375 gallons. Large volume antifreeze installation is much simpler with freezemaster™ antifreeze.

Read the full volume listing update.


freezemaster™ antifreeze is the easiest listed antifreeze to implement in a retrofit

Not all listed antifreezes are compatible with every system. freezemaster™ antifreeze is the only listed antifreeze compatible with galvanized pipe, and combined with the larger volume listing for Ordinary Hazard 1 & 2 applications, switching an existing fire sprinkler system to listed antifreeze will require few or no system modifications with freezemaster™ antifreeze. Know your system and specify the right antifreeze for that system.


freezemaster™ antifreeze is the only antifreeze listed for use with galvanized piping systems and includes a breakthrough corrosion inhibitor package that effectively reduces metallic pipe corrosion by up to 65%

Antifreeze is a must in water-filled fire sprinkler systems, but unlisted antifreeze fluids may significantly corrode metallic pipe. But not freezemaster™ antifreeze. freezemaster™ antifreeze has passed enhanced corrosion testing protocols to far exceed baseline corrosion resistance requirements, resisting both non-biological and MIC corrosion for longer.

Learn how freezemaster antifreeze extends the life of fire sprinkler systems  by resisting corrosion.



How to Install Listed freezemaster Antifreeze

Installing freezemaster™ antifreeze in a typical antifreeze loop can be done in six steps:

  1. Run water through the branch lines and mains to flush the system of potential contaminants. Properly dispose of unlisted fluids flushed from the system.
  2. Shut off the main water valve.
  3. Open the drain valve and fill cup.
  4. Fill the loop with freezemaster™ antifreeze using your preferred method.
  5. Allow the system to set, then test volume and quality from the drain valve.
  6. Close the antifreeze cup valve and reopen the main water valve.

Each UL-listed antifreeze has its own listing requirements that vary. Always consult the manufacturer's installation guide for installation details, testing criteria, and more.

Ready to Switch to Listed Antifreeze?

Don’t delay, get ahead of the game and switch your clients to a listed antifreeze, such as freezemaster™ antifreeze before the NFPA 25 deadline. Our team of experts can provide the localized support and information you need to make the switch.


freezemaster volume calculator

Learn More about freezemaster™ Antifreeze

  • FAQs
  • Blog Post - Why an Expansion Tank Helps You Maintain Listed Antifreeze
  • Blog Post - Where Can I Winterize Sprinkler Piping with freezemaster  Antifreeze?
  • Blog Post - Top 4 Installer Benefits to Switch to a Listed Antifreeze Before  the Deadline
  • Blog Post - 3 Tips for a Successful Listed Antifreeze Installation

Installation Resources

  • Installation Guide
  • Safety Data Sheet
  • Creating an Antifreeze Loop
  • AHJ Checklist
  • Hang Tag
  • Where to Buy

Ready to Get Started?

Contact us for a free consultation. We are committed to providing you with the localized support and information you need for your project.

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