R-408A PT Chart

R-408A saturation pressure, −40 to 150 °F−40 to 65 °C. Used in R-502 retrofits.

Safety class A1Zeotropic blend (low glide)Glide 0.61 °F at 40 °F evap (negligible)Glide 0.34 K at 4.4 °C evap (negligible)

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Step 3 Temperature

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Type a temperature to see the saturation pressure.

R-408A 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-408A saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Liquid bubble, psig	Vapor dew, psig
-40	3.4	3.1
-39	3.9	3.5
-38	4.4	4.0
-37	4.9	4.5
-36	5.3	5.0
-35	5.8	5.4
-34	6.3	5.9
-33	6.9	6.5
-32	7.4	7.0
-31	7.9	7.5
-30	8.5	8.0
-29	9.0	8.6
-28	9.6	9.2
-27	10.2	9.7
-26	10.7	10.3
-25	11.3	10.9
-24	12.0	11.5
-23	12.6	12.1
-22	13.2	12.7
-21	13.8	13.4
-20	14.5	14.0
-19	15.2	14.7
-18	15.8	15.3
-17	16.5	16.0
-16	17.2	16.7
-15	17.9	17.4
-14	18.7	18.1
-13	19.4	18.9
-12	20.1	19.6
-11	20.9	20.4
-10	21.7	21.1
-9	22.5	21.9
-8	23.3	22.7
-7	24.1	23.5
-6	24.9	24.3
-5	25.7	25.1
-4	26.6	26.0
-3	27.5	26.8
-2	28.3	27.7
-1	29.2	28.6
0	30.1	29.5
1	31.1	30.4
2	32.0	31.3
3	32.9	32.3
4	33.9	33.2
5	34.9	34.2
6	35.9	35.2
7	36.9	36.2
8	37.9	37.2
9	39.0	38.3
10	40.0	39.3
11	41.1	40.4
12	42.2	41.4
13	43.3	42.5
14	44.4	43.7
15	45.5	44.8
16	46.7	45.9
17	47.9	47.1
18	49.0	48.3
19	50.2	49.5
20	51.5	50.7
21	52.7	51.9
22	54.0	53.1
23	55.2	54.4
24	56.5	55.7
25	57.8	57.0
26	59.1	58.3
27	60.5	59.6
28	61.9	61.0
29	63.2	62.4
30	64.6	63.7
31	66.0	65.2
32	67.5	66.6
33	68.9	68.0
34	70.4	69.5
35	71.9	71.0
36	73.4	72.5
37	75.0	74.0
38	76.5	75.6
39	78.1	77.1
40	79.7	78.7
41	81.3	80.3
42	82.9	81.9
43	84.6	83.6
44	86.3	85.2
45	88.0	86.9
46	89.7	88.6
47	91.4	90.4
48	93.2	92.1
49	95.0	93.9
50	96.8	95.7
51	98.6	97.5
52	100.5	99.4
53	102.3	101.2
54	104.2	103.1
55	106.1	105.0
56	108.1	107.0
57	110.0	108.9
58	112.0	110.9
59	114.0	112.9
60	116.1	114.9
61	118.1	117.0
62	120.2	119.0
63	122.3	121.1
64	124.5	123.3
65	126.6	125.4
66	128.8	127.6
67	131.0	129.8
68	133.2	132.0
69	135.5	134.2
70	137.8	136.5
71	140.1	138.8
72	142.4	141.1
73	144.8	143.5
74	147.2	145.9
75	149.6	148.3
76	152.0	150.7
77	154.5	153.2
78	157.0	155.6
79	159.5	158.2
80	162.1	160.7
81	164.6	163.3
82	167.2	165.9
83	169.9	168.5
84	172.5	171.1
85	175.2	173.8
86	178.0	176.5
87	180.7	179.3
88	183.5	182.0
89	186.3	184.8
90	189.1	187.7
91	192.0	190.5
92	194.9	193.4
93	197.8	196.3
94	200.8	199.3
95	203.7	202.2
96	206.8	205.2
97	209.8	208.3
98	212.9	211.4
99	216.0	214.5
100	219.1	217.6
101	222.3	220.8
102	225.5	224.0
103	228.8	227.2
104	232.0	230.4
105	235.3	233.7
106	238.7	237.1
107	242.0	240.4
108	245.4	243.8
109	248.9	247.3
110	252.3	250.7
111	255.8	254.2
112	259.4	257.7
113	263.0	261.3
114	266.6	264.9
115	270.2	268.5
116	273.9	272.2
117	277.6	275.9
118	281.3	279.7
119	285.1	283.4
120	289.0	287.3
121	292.8	291.1
122	296.7	295.0
123	300.6	298.9
124	304.6	302.9
125	308.6	306.9
126	312.6	310.9
127	316.7	315.0
128	320.8	319.1
129	325.0	323.3
130	329.2	327.5
131	333.4	331.7
132	337.7	336.0
133	342.0	340.3
134	346.4	344.6
135	350.8	349.0
136	355.2	353.4
137	359.7	357.9
138	364.2	362.4
139	368.7	367.0
140	373.3	371.6
141	377.9	376.2
142	382.6	380.9
143	387.3	385.6
144	392.1	390.3
145	396.9	395.2
146	401.8	400.0
147	406.6	404.9
148	411.6	409.8
149	416.5	414.8
150	421.6	419.8

R-408A saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Liquid bubble, kPa	Vapor dew, kPa
-40	23.8	21.3
-39	29.5	27.0
-38	35.5	32.8
-37	41.6	38.9
-36	48.0	45.2
-35	54.6	51.8
-34	61.4	58.5
-33	68.5	65.5
-32	75.8	72.7
-31	83.3	80.1
-30	91.0	87.8
-29	99.1	95.7
-28	107.3	103.9
-27	115.9	112.4
-26	124.7	121.1
-25	133.7	130.1
-24	143.1	139.3
-23	152.7	148.9
-22	162.6	158.7
-21	172.8	168.8
-20	183.3	179.2
-19	194.1	189.9
-18	205.3	200.9
-17	216.7	212.3
-16	228.5	223.9
-15	240.5	235.9
-14	253.0	248.3
-13	265.7	260.9
-12	278.8	273.9
-11	292.3	287.3
-10	306.1	301.0
-9	320.3	315.1
-8	334.8	329.5
-7	349.8	344.3
-6	365.1	359.5
-5	380.8	375.1
-4	396.9	391.1
-3	413.3	407.5
-2	430.2	424.3
-1	447.6	441.5
0	465.3	459.1
1	483.5	477.1
2	502.1	495.6
3	521.1	514.5
4	540.6	533.9
5	560.5	553.7
6	580.9	574.0
7	601.8	594.7
8	623.1	615.9
9	644.9	637.6
10	667.2	659.8
11	690.0	682.5
12	713.3	705.7
13	737.2	729.4
14	761.5	753.6
15	786.3	778.3
16	811.7	803.6
17	837.6	829.4
18	864.1	855.7
19	891.1	882.6
20	918.7	910.1
21	946.8	938.1
22	975.6	966.7
23	1004.9	995.9
24	1034.8	1025.6
25	1065.2	1056.0
26	1096.3	1087.0
27	1128.1	1118.6
28	1160.4	1150.8
29	1193.3	1183.6
30	1226.9	1217.1
31	1261.2	1251.2
32	1296.1	1286.0
33	1331.6	1321.5
34	1367.9	1357.6
35	1404.8	1394.4
36	1442.4	1431.9
37	1480.7	1470.0
38	1519.6	1508.9
39	1559.4	1548.5
40	1599.8	1588.9
41	1640.9	1629.9
42	1682.8	1671.7
43	1725.5	1714.3
44	1768.9	1757.6
45	1813.0	1801.7
46	1858.0	1846.5
47	1903.7	1892.2
48	1950.2	1938.6
49	1997.6	1985.9
50	2045.7	2033.9
51	2094.6	2082.8
52	2144.4	2132.6
53	2195.1	2183.1
54	2246.6	2234.6
55	2298.9	2286.9
56	2352.1	2340.1
57	2406.2	2394.1
58	2461.2	2449.1
59	2517.1	2505.0
60	2573.9	2561.8
61	2631.6	2619.5
62	2690.3	2678.2
63	2749.9	2737.8
64	2810.5	2798.4
65	2872.0	2860.0

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R-408A PT Chart

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

refrigerantptchart.com

°F	Liquid	Vapor
-40	3.4	3.1
-39	3.9	3.5
-38	4.4	4.0
-37	4.9	4.5
-36	5.3	5.0
-35	5.8	5.4
-34	6.3	5.9
-33	6.9	6.5
-32	7.4	7.0
-31	7.9	7.5
-30	8.5	8.0
-29	9.0	8.6
-28	9.6	9.2
-27	10.2	9.7
-26	10.7	10.3
-25	11.3	10.9
-24	12.0	11.5
-23	12.6	12.1
-22	13.2	12.7
-21	13.8	13.4
-20	14.5	14.0
-19	15.2	14.7
-18	15.8	15.3
-17	16.5	16.0
-16	17.2	16.7
-15	17.9	17.4
-14	18.7	18.1
-13	19.4	18.9
-12	20.1	19.6
-11	20.9	20.4
-10	21.7	21.1
-9	22.5	21.9
-8	23.3	22.7
-7	24.1	23.5
-6	24.9	24.3
-5	25.7	25.1
-4	26.6	26.0
-3	27.5	26.8
-2	28.3	27.7
-1	29.2	28.6
0	30.1	29.5
1	31.1	30.4
2	32.0	31.3
3	32.9	32.3
4	33.9	33.2
5	34.9	34.2
6	35.9	35.2
7	36.9	36.2

°F	Liquid	Vapor
8	37.9	37.2
9	39.0	38.3
10	40.0	39.3
11	41.1	40.4
12	42.2	41.4
13	43.3	42.5
14	44.4	43.7
15	45.5	44.8
16	46.7	45.9
17	47.9	47.1
18	49.0	48.3
19	50.2	49.5
20	51.5	50.7
21	52.7	51.9
22	54.0	53.1
23	55.2	54.4
24	56.5	55.7
25	57.8	57.0
26	59.1	58.3
27	60.5	59.6
28	61.9	61.0
29	63.2	62.4
30	64.6	63.7
31	66.0	65.2
32	67.5	66.6
33	68.9	68.0
34	70.4	69.5
35	71.9	71.0
36	73.4	72.5
37	75.0	74.0
38	76.5	75.6
39	78.1	77.1
40	79.7	78.7
41	81.3	80.3
42	82.9	81.9
43	84.6	83.6
44	86.3	85.2
45	88.0	86.9
46	89.7	88.6
47	91.4	90.4
48	93.2	92.1
49	95.0	93.9
50	96.8	95.7
51	98.6	97.5
52	100.5	99.4
53	102.3	101.2
54	104.2	103.1
55	106.1	105.0

°F	Liquid	Vapor
56	108.1	107.0
57	110.0	108.9
58	112.0	110.9
59	114.0	112.9
60	116.1	114.9
61	118.1	117.0
62	120.2	119.0
63	122.3	121.1
64	124.5	123.3
65	126.6	125.4
66	128.8	127.6
67	131.0	129.8
68	133.2	132.0
69	135.5	134.2
70	137.8	136.5
71	140.1	138.8
72	142.4	141.1
73	144.8	143.5
74	147.2	145.9
75	149.6	148.3
76	152.0	150.7
77	154.5	153.2
78	157.0	155.6
79	159.5	158.2
80	162.1	160.7
81	164.6	163.3
82	167.2	165.9
83	169.9	168.5
84	172.5	171.1
85	175.2	173.8
86	178.0	176.5
87	180.7	179.3
88	183.5	182.0
89	186.3	184.8
90	189.1	187.7
91	192.0	190.5
92	194.9	193.4
93	197.8	196.3
94	200.8	199.3
95	203.7	202.2
96	206.8	205.2
97	209.8	208.3
98	212.9	211.4
99	216.0	214.5
100	219.1	217.6
101	222.3	220.8
102	225.5	224.0
103	228.8	227.2

°F	Liquid	Vapor
104	232.0	230.4
105	235.3	233.7
106	238.7	237.1
107	242.0	240.4
108	245.4	243.8
109	248.9	247.3
110	252.3	250.7
111	255.8	254.2
112	259.4	257.7
113	263.0	261.3
114	266.6	264.9
115	270.2	268.5
116	273.9	272.2
117	277.6	275.9
118	281.3	279.7
119	285.1	283.4
120	289.0	287.3
121	292.8	291.1
122	296.7	295.0
123	300.6	298.9
124	304.6	302.9
125	308.6	306.9
126	312.6	310.9
127	316.7	315.0
128	320.8	319.1
129	325.0	323.3
130	329.2	327.5
131	333.4	331.7
132	337.7	336.0
133	342.0	340.3
134	346.4	344.6
135	350.8	349.0
136	355.2	353.4
137	359.7	357.9
138	364.2	362.4
139	368.7	367.0
140	373.3	371.6
141	377.9	376.2
142	382.6	380.9
143	387.3	385.6
144	392.1	390.3
145	396.9	395.2
146	401.8	400.0
147	406.6	404.9
148	411.6	409.8
149	416.5	414.8
150	421.6	419.8

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-408A PT Chart

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

refrigerantptchart.com

°C	Liquid	Vapor
-40	23.8	21.3
-39	29.5	27.0
-38	35.5	32.8
-37	41.6	38.9
-36	48.0	45.2
-35	54.6	51.8
-34	61.4	58.5
-33	68.5	65.5
-32	75.8	72.7
-31	83.3	80.1
-30	91.0	87.8
-29	99.1	95.7
-28	107.3	103.9
-27	115.9	112.4
-26	124.7	121.1
-25	133.7	130.1
-24	143.1	139.3
-23	152.7	148.9
-22	162.6	158.7
-21	172.8	168.8
-20	183.3	179.2
-19	194.1	189.9
-18	205.3	200.9
-17	216.7	212.3
-16	228.5	223.9
-15	240.5	235.9
-14	253.0	248.3
-13	265.7	260.9
-12	278.8	273.9
-11	292.3	287.3
-10	306.1	301.0
-9	320.3	315.1
-8	334.8	329.5
-7	349.8	344.3
-6	365.1	359.5
-5	380.8	375.1

°C	Liquid	Vapor
-4	396.9	391.1
-3	413.3	407.5
-2	430.2	424.3
-1	447.6	441.5
0	465.3	459.1
1	483.5	477.1
2	502.1	495.6
3	521.1	514.5
4	540.6	533.9
5	560.5	553.7
6	580.9	574.0
7	601.8	594.7
8	623.1	615.9
9	644.9	637.6
10	667.2	659.8
11	690.0	682.5
12	713.3	705.7
13	737.2	729.4
14	761.5	753.6
15	786.3	778.3
16	811.7	803.6
17	837.6	829.4
18	864.1	855.7
19	891.1	882.6
20	918.7	910.1
21	946.8	938.1
22	975.6	966.7
23	1004.9	995.9
24	1034.8	1025.6
25	1065.2	1056.0
26	1096.3	1087.0
27	1128.1	1118.6
28	1160.4	1150.8
29	1193.3	1183.6
30	1226.9	1217.1
31	1261.2	1251.2

°C	Liquid	Vapor
32	1296.1	1286.0
33	1331.6	1321.5
34	1367.9	1357.6
35	1404.8	1394.4
36	1442.4	1431.9
37	1480.7	1470.0
38	1519.6	1508.9
39	1559.4	1548.5
40	1599.8	1588.9
41	1640.9	1629.9
42	1682.8	1671.7
43	1725.5	1714.3
44	1768.9	1757.6
45	1813.0	1801.7
46	1858.0	1846.5
47	1903.7	1892.2
48	1950.2	1938.6
49	1997.6	1985.9
50	2045.7	2033.9
51	2094.6	2082.8
52	2144.4	2132.6
53	2195.1	2183.1
54	2246.6	2234.6
55	2298.9	2286.9
56	2352.1	2340.1
57	2406.2	2394.1
58	2461.2	2449.1
59	2517.1	2505.0
60	2573.9	2561.8
61	2631.6	2619.5
62	2690.3	2678.2
63	2749.9	2737.8
64	2810.5	2798.4
65	2872.0	2860.0

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-408A chart

This R-408A 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 (Honeywell, Arkema, National Refrigerants). Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-408A pressure at 40 °F?

78.7 psig vapor (dew) and 79.7 psig liquid (bubble) at saturation, from the table above.

What is the R-408A pressure at 100 °F?

217.6 psig vapor (dew) and 219.1 psig liquid (bubble) at saturation.

Why does R-408A have two columns?

R-408A is a blend with very little glide (0.61 °F), so liquid (bubble) and vapor (dew) are almost the same. Use vapor for superheat and liquid for subcooling.

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R-408A PT Chart

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R-408A pressure temperature table

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About this R-408A chart

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