Halogen free (natural) refrigerants

Alternatives for HCFC and HFC refrigerants (halogen free refrigerants) (status as of 09.2020)
①: flammable
②: toxic
③: large deviation in refrigerating capacity and pressures to the previous refrigerant

Current
Refrigerants

Alternatives

ASHRAE
Classification

Trade Name

Formula

Detailed Information

R134a

R290/600a

-

C3H8/C4H10

R290 (Propane) as alternative refrigerant

R600a①③

-

C4H10

R404A

R507A

R22

R717①②

-

NH3

NH₃ (Ammonia) as alternative refrigerant

R723①②

-

NH3 + R-E170

R723 (NH₃/DME) as an alternative to NH₃

R290

-

C3H8

R290 (Propane) as alternative refrigerant

R1270

-

C3H6

Propylene (R1270) as an alternative to propane

R124

R600a

-

C4H10

R124 and R142b as substitutes for R114 and R12B1

R410A

no direct alternatives available

R23

R170

-

C2H6

Alternatives for R13 and R503

Various

R744

-

CO2

Carbon dioxide R744 (CO₂) as an alternative refrigerant and secondary fluid