Miller Coolfront Refrigerant R-507 / Freon Gas

Chemical Composition and Properties of R-507

R-507 is an azeotropic blend composed of:

• R-125 (Pentafluoroethane): 50%

• R-143a (Trifluoroethane): 50%

This 50/50 mix creates a non-flammable, non-ozone-depleting refrigerant that behaves similarly to a pure compound. Unlike many blended refrigerants, R-507 does not fractionate, meaning its composition remains stable during phase changes.

Key physical properties:

• Boiling Point: -46.7°C (-52.1°F)

• Global Warming Potential (GWP): ~3985

• Ozone Depletion Potential (ODP): 0

• Lubricant Required: Polyolester (POE) oil

Common Applications of R-507 Freon Gas

Miller Coolfront R-507 is widely used in various commercial and industrial refrigeration systems, especially those that operate at low temperatures. Typical applications include:

• Supermarket freezers and refrigerated display cases

• Cold storage warehouses

• Refrigerated transport systems (trucks, containers)

• Food processing and freezing facilities

• Industrial ice-making equipment

Thanks to its azeotropic nature and excellent performance, R-507 is especially favored in environments where temperature consistency and reliability are essential.

Environmental Considerations and Regulations

While R-507 has zero ozone depletion potential, its very high global warming potential (nearly 4000) places it under increasing regulatory scrutiny. International agreements such as the Kigali Amendment to the Montreal Protocol are pushing for a global phase-down of high-GWP HFCs like R-507.

In regions like the European Union, under the F-Gas Regulation, and in parts of the United States, its use in new systems is restricted or discouraged in favor of low-GWP alternatives. Common replacements include:

• R-448A

• R-449A

• R-744 (CO₂)

Transitioning to these alternatives is crucial for businesses aiming to reduce their carbon footprint and comply with emerging environmental standards.

Benefits of Using Miller Coolfront R-507

Despite its environmental concerns, Miller Coolfront R-507 offers several benefits that continue to support its use in existing systems:

• Excellent thermal stability and cooling performance

• Non-flammable and safe for use in commercial environments

• No temperature glide – ideal for applications requiring precise control

• Easy retrofit option for systems originally designed for R-502

These attributes make it an effective solution for facilities where system replacement is not yet economically feasible.

Conclusion: The Role of R-507 in Today’s Refrigeration Landscape

Miller Coolfront Refrigerant R-507 has proven to be a dependable and efficient refrigerant for a variety of commercial refrigeration needs. While its high GWP means it is being phased out in favor of more sustainable options, it still plays a significant role in existing systems. Facility managers and HVAC-R professionals should stay informed about regulatory developments and begin planning upgrades to environmentally friendly alternatives. In the meantime, R-507 remains a viable option for maintaining performance and reliability in current refrigeration applications.