Freon™ HP81 is an HCFC retrofit refrigerant for R-502 in limited applications where a 10°F to 20°F (5.5°C to 11°C) increase in compressor discharge temperature is desirable, such as some ice machines and other self-contained systems. Field experience has shown that no oil change is needed in many unitary and close-coupled systems.

General Property Information

SNo.	Physical Physical Property	Unit	value
1	Molecular Weight, avg.	g/mol	94.71
2	Boiling Point (1 atm)	°C (°F)	–47.4 (–53.2)
3	Freezing Point (1 atm)	°C (°F	N/A
4	Critical Temperature	°C (°F)	82.6 (180.7)
5	Critical Pressure	kPa (psia)	4445 (644.8)
6	Critical Density	kg/m3 (lb/ft3)	530.7 (33.13)
7	Liquid Density at 25 °C (77 °F)	kg/m3 (lb/ft3)	1156 (72.14
8	Density, Saturated. Vapor at -15 °C (5 °F)	kg/m3 (lb/ft3)	16.90 (1.05)
9	Specific Heat, Liquid at 25 °C (77 °F)	kJ/kg·K (Btu/lb·°F)	1.34 (0.320)
10	Specific Heat, Vapor at 25 °C (77 °F) (1 atm)	kJ/kg·K (Btu/lb·°F)	0.725 (0.173)
11	Vapor Pressure at 25 °C (77 °F)	kPa (psia)	1254 (181.9
12	Heat of Vaporization at Boiling Point	kJ/kg (Btu/lb)	210.0 (90.3)
13	Thermal Conductivity at 25 °C (77 °F) Liquid Vapor (1 atm)	W/m·K (Btu/hr·ft·°F) W/m·K (Btu/hr·ft·°F)	7.35E-2 (4.25E-2) 1.205E-2 (6.96E-3) 7
14	Viscosity at 25 °C (77 °F) Liquid Vapor (1 atm)	Pa·s Pa·s	1.45E-4 1.28E-5
15	Flammability Limit in Air (1 atm)	vol%	None
16	Ozone Depletion Potential	(CFC-12 = 1.0)	0.03
17	Halocarbon Global Warming Potential	(CFC-11 = 1.0)	0.52
18	TSCA Inventory Status	Reported/Included?	Yes
19	Inhalation Exposure Limit*	ppm (8- and 12-hr TWA)	1000

Applications

Low- and medium-temperature commercial refrigeration equipment:

1. Ice machines

2. Self-contained equipment