Why has R-507 been popular in low-temperature refrigeration?
R-507 is azeotropic, meaning its two components evaporate and condense together, so it has no temperature glide and its composition stays stable after leaks. This makes servicing straightforward and allows efficient heat exchanger design. It also offers good capacity at low evaporating temperatures, which made it a common choice for frozen food storage, blast freezers, and ice rinks after R-502 was phased out. Its non-flammability and low toxicity added to its appeal. Contractors familiar with R-502 systems found the transition simple, which helped R-507 spread quickly in the late 1990s and 2000s.

How do EU rules affect R-507?
Under the EU F-gas Regulation, virgin refrigerants with a GWP of 2,500 or more cannot be used to service equipment with charges of 40 tonnes CO₂ equivalent or more since 2020, which for R-507 means charges above about 10 kg. Reclaimed or recycled R-507 could still be used until 2030. As a result, many European users have retrofitted to R-448A, R-449A, or R-452A, or replaced systems with CO₂ or ammonia.

How does HFC-143a supply affect the market?
HFC-143a makes up half of R-507. EPA data show that US imports of HFC-143a rose 126% between 2022 and 2025, from 1,954 to 4,408 tonnes, and that all US supply of this component is imported. HFC-125, the other half, saw supply fall about 45% over the same period. Dependence on imports and falling HFC-125 supply make R-507 availability sensitive to trade and allowance decisions.

What US rules apply?
The EPA Technology Transitions rule restricts high-GWP refrigerants in new cold storage warehouses and remote condensing units from 2026 and supermarket systems from 2027. The EPA issued a final reconsideration rule in May 2026 addressing petitions in these subsectors. Existing R-507 systems can still be serviced, and from 2029 supermarket systems and refrigerated transport must be serviced with reclaimed HFCs.

How important are cold storage and frozen food?
Cold storage warehouses for dairy, frozen food, meat, seafood, and fresh produce are major users of R-507 because they need reliable low-temperature refrigeration. Many medium-sized facilities chose R-507 rather than ammonia to avoid toxicity concerns and specialized operator requirements. These systems have large charges, so each leak or overhaul creates significant servicing demand. Operators running facilities around the clock also value refrigerants that technicians across the industry already know how to handle.

How are ice rinks and recreational facilities served?
Many indoor ice rinks were built with R-507 or R-22 direct or indirect refrigeration systems. These facilities are now converting to ammonia, CO₂, or HFO blends, but existing R-507 systems continue to need servicing. Rink operators often keep refrigerant on hand because seasonal operation depends on reliable cooling. Municipal rinks often face budget limits, so they may continue servicing R-507 until a larger renovation project is approved.

What replaces R-507?
Common retrofit options are R-448A and R-449A, both non-flammable HFO blends with GWPs around 1,300–1,400. Solstice Advanced Materials lists R-507 among the refrigerants replaced by Solstice N40 (R-448A). In new systems, CO₂, ammonia, and ammonia/CO₂ cascade systems are increasingly used for low-temperature applications.

What is the role of reclaimed R-507?
Because R-507 is azeotropic, recovered refrigerant is relatively easy to reclaim to specification. Reclaimed R-507 can be used in the EU for servicing until 2030 and will be required in the United States for some servicing from 2029. Reclaimers are building inventories to serve these needs, and Hudson Technologies said in March 2026 that the phase-down of R-404A and R-507 should expand demand for replacement blends.

How is R-507 sold?
Large food processors and cold storage operators often buy directly from producers or distributors under contracts. Refrigerant distributors and HVAC&R wholesalers supply contractors and service companies, while online channels serve small buyers where allowed. Refrigeration service providers also manage recovery and return of refrigerant for reclamation. Many contractors offer combined servicing and recovery so that refrigerant removed during repairs can be returned for reclamation.

Which R507 refrigerant market segments are growing fastest?
Reclaimed R-507; cold storage and warehousing, especially frozen food storage; food processing refrigeration; process refrigeration systems; and refrigeration service providers handling servicing and recovery are the fastest-growing segments.