R507 is an azeotropic HFC (Hydrofluorocarbon) refrigerant blend consisting of R125 (50%) and R143a (50%). It was developed as a high-performance replacement for R502 and R22, primarily used in low and medium-temperature commercial and industrial refrigeration systems.
General Characteristics
- Environmental Profile: It has zero Ozone Depletion Potential (ODP = 0). However, it has a high Global Warming Potential (GWP) of 3985, which subjects it to strict environmental regulations and phase-down programs.
- Safety Classification: Rated as A1 (Non-toxic and non-flammable) by ASHRAE.
- Azeotropic Behavior: R507 is a true azeotrope with Zero Temperature Glide. This means its composition remains identical in both liquid and vapor phases, allowing for easy recharging after a leak without affecting system performance.
- Lubrication: It is compatible only with POE (Polyolester) synthetic oils; it cannot be used with traditional mineral oils.
- Performance: It offers slightly better efficiency and capacity in some applications compared to R404A, while maintaining very similar operating pressures.
| Property | Value |
| Components | R125 / R143a (50% / 50%) |
| Molecular Weight | 98.86 g/mol |
| Boiling Point (at 1 atm) | -47.1 °C (-52.8 °F) |
| Critical Temperature | 70.6 °C (159.1 °F) |
| Critical Pressure | 37.0 bar (536.6 psia) |
| Liquid Density (at 25°C) | 1055 kg/m³ |
| Vapor Pressure (at 25°C) | 12.8 bar (185.6 psia) |
| Safety Group | A1 |
Typical Applications
- Commercial Refrigeration: Supermarket display cases, walk-in freezers, and ice machines.
- Industrial Cooling: Cold storage warehouses and food processing systems.
- Transport Refrigeration: Refrigerated shipping containers and trucks.