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R-744 (CO₂) PT Chart

A1 GWP 1

Carbon dioxide (CO₂). Natural.

Boiling Point

-126.5°F

-88.1°C

Critical Temp

87.8°F

31°C

Critical Pressure

1070 psia

73.77 bar

R-744 (CO₂) Pressure-Temperature Graph

R-744 (CO₂) Saturation Pressure Table

Blue values indicate vacuum (below atmospheric pressure).

°F	°C	PSIG	PSIA	kPa	bar
-70	-56.7	60.1	74.77	515.5	5.155
-65	-53.9	69.5	84.23	580.8	5.808
-60	-51.1	79.9	94.57	652.1	6.521
-55	-48.3	91.1	105.84	729.7	7.297
-50	-45.6	103.4	118.08	814.1	8.141
-45	-42.8	116.6	131.34	905.6	9.056
-40	-40.0	131.0	145.69	1004.5	10.045
-35	-37.2	146.5	161.17	1111.2	11.112
-30	-34.4	163.1	177.83	1226.1	12.261
-25	-31.7	181.0	195.72	1349.5	13.495
-20	-28.9	200.2	214.91	1481.8	14.818
-15	-26.1	220.8	235.45	1623.4	16.234
-10	-23.3	242.7	257.4	1774.7	17.747
-5	-20.6	266.1	280.81	1936.1	19.361
0	-17.8	291.0	305.74	2108.0	21.08
5	-15.0	317.6	332.25	2290.8	22.908
10	-12.2	345.7	360.41	2484.9	24.849
15	-9.4	375.6	390.27	2690.8	26.908
20	-6.7	407.2	421.91	2908.9	29.089
25	-3.9	440.7	455.38	3139.8	31.398
30	-1.1	476.1	490.77	3383.7	33.837
35	1.7	513.4	528.14	3641.4	36.414
40	4.4	552.9	567.58	3913.3	39.133
45	7.2	594.5	609.16	4200.0	42.0
50	10.0	638.3	652.99	4502.2	45.022
55	12.8	684.4	699.15	4820.4	48.204
60	15.6	733.1	747.75	5155.6	51.556
65	18.3	784.2	798.93	5508.4	55.084
70	21.1	838.1	852.82	5880.0	58.8
75	23.9	894.9	909.62	6271.6	62.716
80	26.7	954.9	969.57	6685.0	66.85
85	29.4	1018.4	1033.07	7122.8	71.228

Properties

ASHRAE Designation	744
Safety Classification	A1 (non-flammable, low toxicity)
GWP (AR5)	1
ODP	0
Molecular Weight	44.01 g/mol
Boiling Point (1 atm)	-126.5°F / -88.1°C
Critical Temperature	87.8°F / 31°C
Critical Pressure	1070 psia / 73.77 bar
Category	Natural

Common Applications

Transcritical systems
Supermarket refrigeration
Heat pumps
Vending machines