R-404A PT Chart

R-404A saturation pressure, −40 to 150 °F−40 to 65 °C. Used in low and medium temperature commercial refrigeration.

Safety class A1Zeotropic blend (low glide)Glide 0.89 °F at 40 °F evap (negligible)Glide 0.50 K at 4.4 °C evap (negligible)

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Step 3 Temperature

°F°C

Type a temperature to see the saturation pressure.

R-404A pressure temperature table

Liquid = bubble (subcooling). Vapor = dew (superheat). Highlighted: 40 °F and 100 °F.Liquid = bubble (subcooling). Vapor = dew (superheat). Negative kPa = vacuum. Highlighted: 4 °C and 38 °C.

R-404A saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Liquid bubble, psig	Vapor dew, psig
-40	4.9	4.3
-39	5.4	4.8
-38	5.9	5.3
-37	6.4	5.8
-36	7.0	6.3
-35	7.5	6.8
-34	8.0	7.4
-33	8.6	7.9
-32	9.2	8.5
-31	9.7	9.0
-30	10.3	9.6
-29	10.9	10.2
-28	11.5	10.8
-27	12.2	11.4
-26	12.8	12.0
-25	13.4	12.7
-24	14.1	13.3
-23	14.8	14.0
-22	15.4	14.6
-21	16.1	15.3
-20	16.8	16.0
-19	17.5	16.7
-18	18.3	17.4
-17	19.0	18.2
-16	19.8	18.9
-15	20.5	19.7
-14	21.3	20.4
-13	22.1	21.2
-12	22.9	22.0
-11	23.7	22.8
-10	24.6	23.6
-9	25.4	24.5
-8	26.3	25.3
-7	27.1	26.2
-6	28.0	27.0
-5	28.9	27.9
-4	29.8	28.8
-3	30.8	29.8
-2	31.7	30.7
-1	32.7	31.6
0	33.7	32.6
1	34.7	33.6
2	35.7	34.6
3	36.7	35.6
4	37.7	36.6
5	38.8	37.7
6	39.8	38.7
7	40.9	39.8
8	42.0	40.9
9	43.1	42.0
10	44.3	43.1
11	45.4	44.3
12	46.6	45.4
13	47.8	46.6
14	49.0	47.8
15	50.2	49.0
16	51.5	50.2
17	52.7	51.5
18	54.0	52.7
19	55.3	54.0
20	56.6	55.3
21	57.9	56.6
22	59.3	58.0
23	60.6	59.3
24	62.0	60.7
25	63.4	62.1
26	64.8	63.5
27	66.3	64.9
28	67.8	66.4
29	69.2	67.8
30	70.7	69.3
31	72.3	70.8
32	73.8	72.4
33	75.4	73.9
34	77.0	75.5
35	78.6	77.1
36	80.2	78.7
37	81.8	80.3
38	83.5	82.0
39	85.2	83.7
40	86.9	85.4
41	88.6	87.1
42	90.4	88.8
43	92.2	90.6
44	94.0	92.4
45	95.8	94.2
46	97.6	96.0
47	99.5	97.9
48	101.4	99.8
49	103.3	101.7
50	105.3	103.6
51	107.2	105.6
52	109.2	107.5
53	111.2	109.5
54	113.3	111.6
55	115.3	113.6
56	117.4	115.7
57	119.5	117.8
58	121.7	119.9
59	123.8	122.1
60	126.0	124.2
61	128.2	126.4
62	130.5	128.7
63	132.7	130.9
64	135.0	133.2
65	137.3	135.5
66	139.7	137.8
67	142.0	140.2
68	144.4	142.6
69	146.9	145.0
70	149.3	147.4
71	151.8	149.9
72	154.3	152.4
73	156.8	154.9
74	159.4	157.5
75	162.0	160.1
76	164.6	162.7
77	167.3	165.3
78	169.9	168.0
79	172.7	170.7
80	175.4	173.4
81	178.2	176.2
82	181.0	179.0
83	183.8	181.8
84	186.7	184.6
85	189.5	187.5
86	192.5	190.4
87	195.4	193.4
88	198.4	196.4
89	201.4	199.4
90	204.5	202.4
91	207.5	205.5
92	210.7	208.6
93	213.8	211.7
94	217.0	214.9
95	220.2	218.1
96	223.4	221.3
97	226.7	224.6
98	230.0	227.9
99	233.4	231.3
100	236.8	234.6
101	240.2	238.1
102	243.6	241.5
103	247.1	245.0
104	250.6	248.5
105	254.2	252.0
106	257.8	255.6
107	261.4	259.3
108	265.1	262.9
109	268.8	266.6
110	272.5	270.4
111	276.3	274.1
112	280.1	278.0
113	284.0	281.8
114	287.9	285.7
115	291.8	289.6
116	295.8	293.6
117	299.8	297.6
118	303.8	301.7
119	307.9	305.7
120	312.0	309.9
121	316.2	314.1
122	320.4	318.3
123	324.7	322.5
124	329.0	326.8
125	333.3	331.2
126	337.7	335.5
127	342.1	340.0
128	346.6	344.4
129	351.1	349.0
130	355.6	353.5
131	360.2	358.1
132	364.9	362.8
133	369.6	367.5
134	374.3	372.2
135	379.1	377.0
136	383.9	381.9
137	388.8	386.7
138	393.7	391.7
139	398.7	396.7
140	403.7	401.7
141	408.8	406.8
142	413.9	411.9
143	419.1	417.1
144	424.3	422.4
145	429.6	427.7
146	434.9	433.1
147	440.3	438.5
148	445.7	443.9
149	451.2	449.5
150	456.8	455.1

R-404A saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Liquid bubble, kPa	Vapor dew, kPa
-40	34.0	29.6
-39	40.2	35.7
-38	46.6	42.0
-37	53.2	48.6
-36	60.1	55.3
-35	67.2	62.3
-34	74.6	69.5
-33	82.1	77.0
-32	90.0	84.7
-31	98.1	92.7
-30	106.5	100.9
-29	115.1	109.4
-28	124.0	118.2
-27	133.2	127.2
-26	142.6	136.6
-25	152.4	146.2
-24	162.5	156.1
-23	172.8	166.3
-22	183.5	176.9
-21	194.5	187.7
-20	205.8	198.9
-19	217.4	210.4
-18	229.4	222.2
-17	241.7	234.3
-16	254.3	246.8
-15	267.3	259.7
-14	280.7	272.9
-13	294.4	286.5
-12	308.5	300.4
-11	323.0	314.7
-10	337.8	329.4
-9	353.0	344.5
-8	368.7	360.0
-7	384.7	375.9
-6	401.2	392.2
-5	418.0	408.9
-4	435.3	426.1
-3	453.1	443.6
-2	471.2	461.7
-1	489.8	480.1
0	508.9	499.0
1	528.4	518.4
2	548.4	538.2
3	568.8	558.5
4	589.7	579.3
5	611.1	600.5
6	633.1	622.3
7	655.5	644.6
8	678.4	667.3
9	701.8	690.6
10	725.8	714.4
11	750.3	738.8
12	775.3	763.6
13	800.9	789.1
14	827.0	815.1
15	853.7	841.6
16	880.9	868.7
17	908.8	896.4
18	937.2	924.7
19	966.2	953.6
20	995.8	983.1
21	1026.1	1013.2
22	1056.9	1043.9
23	1088.4	1075.3
24	1120.5	1107.2
25	1153.3	1139.9
26	1186.7	1173.2
27	1220.7	1207.1
28	1255.5	1241.7
29	1290.9	1277.1
30	1327.0	1313.1
31	1363.8	1349.8
32	1401.3	1387.2
33	1439.6	1425.3
34	1478.5	1464.2
35	1518.2	1503.8
36	1558.7	1544.2
37	1599.9	1585.3
38	1641.8	1627.2
39	1684.6	1669.8
40	1728.1	1713.3
41	1772.4	1757.6
42	1817.6	1802.7
43	1863.5	1848.6
44	1910.3	1895.4
45	1958.0	1943.0
46	2006.5	1991.5
47	2055.8	2040.9
48	2106.1	2091.1
49	2157.2	2142.3
50	2209.3	2194.4
51	2262.3	2247.4
52	2316.2	2301.4
53	2371.1	2356.3
54	2427.0	2412.3
55	2483.8	2469.2
56	2541.7	2527.2
57	2600.5	2586.2
58	2660.5	2646.3
59	2721.4	2707.4
60	2783.5	2769.7
61	2846.7	2833.2
62	2911.1	2897.8
63	2976.6	2963.6
64	3043.3	3030.7
65	3111.2	3099.0

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R-404A PT Chart

°F / psig · Safety class A1 · Zeotropic blend (low glide)

refrigerantptchart.com

°F	Liquid	Vapor
-40	4.9	4.3
-39	5.4	4.8
-38	5.9	5.3
-37	6.4	5.8
-36	7.0	6.3
-35	7.5	6.8
-34	8.0	7.4
-33	8.6	7.9
-32	9.2	8.5
-31	9.7	9.0
-30	10.3	9.6
-29	10.9	10.2
-28	11.5	10.8
-27	12.2	11.4
-26	12.8	12.0
-25	13.4	12.7
-24	14.1	13.3
-23	14.8	14.0
-22	15.4	14.6
-21	16.1	15.3
-20	16.8	16.0
-19	17.5	16.7
-18	18.3	17.4
-17	19.0	18.2
-16	19.8	18.9
-15	20.5	19.7
-14	21.3	20.4
-13	22.1	21.2
-12	22.9	22.0
-11	23.7	22.8
-10	24.6	23.6
-9	25.4	24.5
-8	26.3	25.3
-7	27.1	26.2
-6	28.0	27.0
-5	28.9	27.9
-4	29.8	28.8
-3	30.8	29.8
-2	31.7	30.7
-1	32.7	31.6
0	33.7	32.6
1	34.7	33.6
2	35.7	34.6
3	36.7	35.6
4	37.7	36.6
5	38.8	37.7
6	39.8	38.7
7	40.9	39.8

°F	Liquid	Vapor
8	42.0	40.9
9	43.1	42.0
10	44.3	43.1
11	45.4	44.3
12	46.6	45.4
13	47.8	46.6
14	49.0	47.8
15	50.2	49.0
16	51.5	50.2
17	52.7	51.5
18	54.0	52.7
19	55.3	54.0
20	56.6	55.3
21	57.9	56.6
22	59.3	58.0
23	60.6	59.3
24	62.0	60.7
25	63.4	62.1
26	64.8	63.5
27	66.3	64.9
28	67.8	66.4
29	69.2	67.8
30	70.7	69.3
31	72.3	70.8
32	73.8	72.4
33	75.4	73.9
34	77.0	75.5
35	78.6	77.1
36	80.2	78.7
37	81.8	80.3
38	83.5	82.0
39	85.2	83.7
40	86.9	85.4
41	88.6	87.1
42	90.4	88.8
43	92.2	90.6
44	94.0	92.4
45	95.8	94.2
46	97.6	96.0
47	99.5	97.9
48	101.4	99.8
49	103.3	101.7
50	105.3	103.6
51	107.2	105.6
52	109.2	107.5
53	111.2	109.5
54	113.3	111.6
55	115.3	113.6

°F	Liquid	Vapor
56	117.4	115.7
57	119.5	117.8
58	121.7	119.9
59	123.8	122.1
60	126.0	124.2
61	128.2	126.4
62	130.5	128.7
63	132.7	130.9
64	135.0	133.2
65	137.3	135.5
66	139.7	137.8
67	142.0	140.2
68	144.4	142.6
69	146.9	145.0
70	149.3	147.4
71	151.8	149.9
72	154.3	152.4
73	156.8	154.9
74	159.4	157.5
75	162.0	160.1
76	164.6	162.7
77	167.3	165.3
78	169.9	168.0
79	172.7	170.7
80	175.4	173.4
81	178.2	176.2
82	181.0	179.0
83	183.8	181.8
84	186.7	184.6
85	189.5	187.5
86	192.5	190.4
87	195.4	193.4
88	198.4	196.4
89	201.4	199.4
90	204.5	202.4
91	207.5	205.5
92	210.7	208.6
93	213.8	211.7
94	217.0	214.9
95	220.2	218.1
96	223.4	221.3
97	226.7	224.6
98	230.0	227.9
99	233.4	231.3
100	236.8	234.6
101	240.2	238.1
102	243.6	241.5
103	247.1	245.0

°F	Liquid	Vapor
104	250.6	248.5
105	254.2	252.0
106	257.8	255.6
107	261.4	259.3
108	265.1	262.9
109	268.8	266.6
110	272.5	270.4
111	276.3	274.1
112	280.1	278.0
113	284.0	281.8
114	287.9	285.7
115	291.8	289.6
116	295.8	293.6
117	299.8	297.6
118	303.8	301.7
119	307.9	305.7
120	312.0	309.9
121	316.2	314.1
122	320.4	318.3
123	324.7	322.5
124	329.0	326.8
125	333.3	331.2
126	337.7	335.5
127	342.1	340.0
128	346.6	344.4
129	351.1	349.0
130	355.6	353.5
131	360.2	358.1
132	364.9	362.8
133	369.6	367.5
134	374.3	372.2
135	379.1	377.0
136	383.9	381.9
137	388.8	386.7
138	393.7	391.7
139	398.7	396.7
140	403.7	401.7
141	408.8	406.8
142	413.9	411.9
143	419.1	417.1
144	424.3	422.4
145	429.6	427.7
146	434.9	433.1
147	440.3	438.5
148	445.7	443.9
149	451.2	449.5
150	456.8	455.1

Liquid = bubble (use for subcooling). Vapor = dew (use for superheat). Bold rows: 40 °F and 100 °F. Reference only: always verify with the manufacturer’s data and your gauges.

R-404A PT Chart

°C / kPa (gauge) · Safety class A1 · Zeotropic blend (low glide)

refrigerantptchart.com

°C	Liquid	Vapor
-40	34.0	29.6
-39	40.2	35.7
-38	46.6	42.0
-37	53.2	48.6
-36	60.1	55.3
-35	67.2	62.3
-34	74.6	69.5
-33	82.1	77.0
-32	90.0	84.7
-31	98.1	92.7
-30	106.5	100.9
-29	115.1	109.4
-28	124.0	118.2
-27	133.2	127.2
-26	142.6	136.6
-25	152.4	146.2
-24	162.5	156.1
-23	172.8	166.3
-22	183.5	176.9
-21	194.5	187.7
-20	205.8	198.9
-19	217.4	210.4
-18	229.4	222.2
-17	241.7	234.3
-16	254.3	246.8
-15	267.3	259.7
-14	280.7	272.9
-13	294.4	286.5
-12	308.5	300.4
-11	323.0	314.7
-10	337.8	329.4
-9	353.0	344.5
-8	368.7	360.0
-7	384.7	375.9
-6	401.2	392.2
-5	418.0	408.9

°C	Liquid	Vapor
-4	435.3	426.1
-3	453.1	443.6
-2	471.2	461.7
-1	489.8	480.1
0	508.9	499.0
1	528.4	518.4
2	548.4	538.2
3	568.8	558.5
4	589.7	579.3
5	611.1	600.5
6	633.1	622.3
7	655.5	644.6
8	678.4	667.3
9	701.8	690.6
10	725.8	714.4
11	750.3	738.8
12	775.3	763.6
13	800.9	789.1
14	827.0	815.1
15	853.7	841.6
16	880.9	868.7
17	908.8	896.4
18	937.2	924.7
19	966.2	953.6
20	995.8	983.1
21	1026.1	1013.2
22	1056.9	1043.9
23	1088.4	1075.3
24	1120.5	1107.2
25	1153.3	1139.9
26	1186.7	1173.2
27	1220.7	1207.1
28	1255.5	1241.7
29	1290.9	1277.1
30	1327.0	1313.1
31	1363.8	1349.8

°C	Liquid	Vapor
32	1401.3	1387.2
33	1439.6	1425.3
34	1478.5	1464.2
35	1518.2	1503.8
36	1558.7	1544.2
37	1599.9	1585.3
38	1641.8	1627.2
39	1684.6	1669.8
40	1728.1	1713.3
41	1772.4	1757.6
42	1817.6	1802.7
43	1863.5	1848.6
44	1910.3	1895.4
45	1958.0	1943.0
46	2006.5	1991.5
47	2055.8	2040.9
48	2106.1	2091.1
49	2157.2	2142.3
50	2209.3	2194.4
51	2262.3	2247.4
52	2316.2	2301.4
53	2371.1	2356.3
54	2427.0	2412.3
55	2483.8	2469.2
56	2541.7	2527.2
57	2600.5	2586.2
58	2660.5	2646.3
59	2721.4	2707.4
60	2783.5	2769.7
61	2846.7	2833.2
62	2911.1	2897.8
63	2976.6	2963.6
64	3043.3	3030.7
65	3111.2	3099.0

Liquid = bubble (use for subcooling). Vapor = dew (use for superheat). Bold rows: 4 °C and 38 °C. Reference only: always verify with the manufacturer’s data and your gauges.

How to use

Choose Temperature or Pressure and type the number. The answer shows straight away.
Blends show two values: use vapor (dew) for superheat and liquid (bubble) for subcooling.
Tap °C · kPa for metric. Below 0 psig, pressure is in inches of mercury (inHg) vacuum.
Press Print pocket chart for a one-page chart (Letter or A4) for the van or the tool bag.

About this R-404A chart

This R-404A pressure temperature chart gives the saturation pressure for every degree, in psig with °F or kPa (gauge) with °C. As a blend, it has a liquid (bubble) and a vapor (dew) column.

Source: manufacturer and supplier charts (Chemours, Honeywell, Arkema, A-Gas). Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-404A pressure at 40 °F?

85.4 psig vapor (dew) and 86.9 psig liquid (bubble) at saturation, from the table above.

What is the R-404A pressure at 100 °F?

234.6 psig vapor (dew) and 236.8 psig liquid (bubble) at saturation.

Why does R-404A have two columns?

R-404A is a blend with very little glide (0.89 °F), so liquid (bubble) and vapor (dew) are almost the same. Use vapor for superheat and liquid for subcooling.

R-404A PT Chart

PT lookup

R-404A pressure temperature table

How to use

About this R-404A chart

FAQ

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