Hercules® RTU-35 Cryo-Tek™ Antifreeze

Hercules® Cryo-Tek™RTU-35 Antifreeze is a ready to use 35% Virgin Propylene Glycol formula with no dilution required. It's designed for hydronic heating and cooling closed loop systems, most solar heating systems, snow melts, radiant heat and general plumbing systems. Behold the power of Hercules®, products built to last and trusted by plumbers to withstand even the toughest conditions.

Available in 2 variations

Key Features & Benefits

Blend of 35 percent virgin propylene glycol
The triple protection inhibitor stabilizes pH to prevent corrosion, chelates, hard water minerals, and inhibit scale and sediment formation
Used in systems fabricated with metal, plastics and rubber piping, fittings, seals and other parts
For heating systems requiring freeze protection as well as corrosion prevention
Cryo-Tek is “GRAS” (Generally Recognized As Safe) for incidental contact with food
For warranty product details, refer to the Oatey limited Warranty document

Specifications

Brand:	Hercules
California VOC Compliant:	Yes
Color:	Green

More Specifications

Technical Resources (6)

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Frequently Asked Questions

What are the differences between virgin propylene glycol and reclaimed/recycled propylene glycol?

Virgin propylene glycol has never been used previously. Some boiler manufacturers state in their warranties that antifreeze made with virgin propylene glycol is required or the warranty is voided. Recycled propylene glycol is captured and cleaned after use (mainly for de-icing aircraft). It is then considered a lower grade of propylene glycol and may still contain other ingredients even after cleaning. Hercules Cryo-Tek antifreeze is made only with virgin propylene glycol.

Are there specific products for aluminum boiler systems?

Yes. Use Cryo-Tek 100AL antifreeze for boilers with aluminum heat exchangers. Sludgehammer Universal Corrosion Inhibitor and Sludgehammer System Restorer & Noise Reducer is compatible with all metal heat exchangers, including aluminum.

Should I dilute Cryo-Tek antifreeze?

The answer depends on which Cryo-Tek antifreeze is being used, and what level of freeze protection is required. For more information, see this chart. Freeze point: The temperature at which crystals begin to form. Pumpable: The temperature at which there are sufficient crystals to impede the flow of the product. Burst protection: The temperature at which pipes burst.