Details

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R290 (Propane) is refrigerant grade propane, used as an alternative to R22 and R502 in low, medium and high-temperature refrigeration and air-conditioning applications.
R290 (Propane) is a hydrocarbon and although highly flammable it is an efficient refrigerant that has a lower Global Warming Potential (GWP)

Features and Benefits

• Refrigerant can be charged from either the liquid and vapour phase
• Flammable and non-toxic with a safety classification of A3
• Compressors can be charged with a variety of oils - contact the compressor manufacturer for more information
• Lower GWP of 3
• Excellent thermodynamic properties leading to high energy efficiency
• Low charges allow for smaller heat exchanges and piping dimensions
• Due to its flammable nature R290 (Propane) requires different charging and recovery procedures

Sources : https://www.agas.com/au/products-services/refrigerants/r290