HFC R- 404A is an established alternative to R-22 and R-502. Please note that for reduced GWP, HFC R-407A offers a good alternative.

Property	S.I. Units	Value	British Units	Value
Molecular Weight	kg/kmol	97.6	lbm/lbmol	97.6
Critical Temperature	°C	72.05	°F	161.68
Critical Pressure	bara	37.29	psia	540.83
Critical Density	kg/m3	486.54	lb/ft3	30.37
Atmospheric Bubble Point	°C	-46.2	°F	-51.2
Atmospheric Dew Point	°C	-45.5	°F	-49.8
Latent Heat of Vapourisation at Atmospheric Pressure	kJ/kg	199.61	BTUIT/lb	85.82
Saturated Vapour Density at Atmospheric Pressure*	kg/m3	5.48	lb/ft3	0.34
Liquid Vapour Pressure @25°C	bara	12.5	psia	182
Coefficient of Volumetric Thermal Expansion for Saturated Liquid at 25°C	°C-1	0.00495	°F-1	0.00275
Speed of Sound* for Saturated Vapour at 25°C	m/s	133.8	ft/s	438.94
Adiabatic Exponent* for Saturated Vapour at 25°C		1.37		1.37
Latent Heat of Vapourisation at 25°C	kJ/kg	138.99	BTUIT/lb	59.75
Saturated Vapour Density at 25°C*	kg/m3	65.27	lb/ft3	4.07
Saturated Vapour Density at 0°C*	kg/m3	30.47	lb/ft3	1.9
* Vapour composition as per bulk refrigerant at dew point