R-401B PT Chart

R-401B saturation pressure, −40 to 150 °F−40 to 65 °C. Used in R-12 retrofits in lower-temperature systems (MP66).

How to use ↓

Safety class A1Zeotropic blendGlide 9.07 °F at 40 °F evapGlide 5.04 K at 4.4 °C evap

PT lookup

Step 1 Refrigerant

Step 2 I know the

Temperature Pressure

Step 3 Temperature

°F°C

Type a temperature to see the saturation pressure.

R-401B pressure temperature table

Liquid = bubble (subcooling). Vapor = dew (superheat). Below 0 psig: inches of mercury vacuum. Highlighted: 40 °F and 100 °F.Liquid = bubble (subcooling). Vapor = dew (superheat). Negative kPa = vacuum. Highlighted: 4 °C and 38 °C.

R-401B saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Liquid bubble, psig	Vapor dew, psig
-40	6.7 inHg	12.4 inHg
-39	6.1 inHg	11.9 inHg
-38	5.4 inHg	11.3 inHg
-37	4.8 inHg	10.8 inHg
-36	4.1 inHg	10.3 inHg
-35	3.4 inHg	9.7 inHg
-34	2.8 inHg	9.2 inHg
-33	2.1 inHg	8.6 inHg
-32	1.3 inHg	8.0 inHg
-31	0.6 inHg	7.4 inHg
-30	0.1	6.8 inHg
-29	0.4	6.2 inHg
-28	0.8	5.5 inHg
-27	1.2	4.9 inHg
-26	1.6	4.2 inHg
-25	2.0	3.5 inHg
-24	2.4	2.8 inHg
-23	2.8	2.1 inHg
-22	3.3	1.4 inHg
-21	3.7	0.6 inHg
-20	4.1	0.1
-19	4.6	0.4
-18	5.1	0.8
-17	5.5	1.2
-16	6.0	1.6
-15	6.5	2.0
-14	7.0	2.5
-13	7.5	2.9
-12	8.0	3.3
-11	8.5	3.8
-10	9.1	4.2
-9	9.6	4.7
-8	10.2	5.1
-7	10.7	5.6
-6	11.3	6.1
-5	11.9	6.6
-4	12.5	7.1
-3	13.1	7.6
-2	13.7	8.1
-1	14.3	8.7
0	14.9	9.2
1	15.6	9.8
2	16.2	10.3
3	16.9	10.9
4	17.5	11.5
5	18.2	12.1
6	18.9	12.7
7	19.6	13.3
8	20.3	13.9
9	21.1	14.6
10	21.8	15.2
11	22.6	15.9
12	23.3	16.5
13	24.1	17.2
14	24.9	17.9
15	25.7	18.6
16	26.5	19.3
17	27.3	20.0
18	28.2	20.8
19	29.0	21.5
20	29.9	22.3
21	30.8	23.0
22	31.7	23.8
23	32.6	24.6
24	33.5	25.4
25	34.4	26.3
26	35.4	27.1
27	36.3	27.9
28	37.3	28.8
29	38.3	29.7
30	39.3	30.6
31	40.3	31.5
32	41.3	32.4
33	42.4	33.3
34	43.4	34.3
35	44.5	35.2
36	45.6	36.2
37	46.7	37.2
38	47.8	38.2
39	48.9	39.2
40	50.1	40.2
41	51.2	41.3
42	52.4	42.3
43	53.6	43.4
44	54.8	44.5
45	56.0	45.6
46	57.3	46.7
47	58.5	47.9
48	59.8	49.0
49	61.1	50.2
50	62.4	51.4
51	63.8	52.6
52	65.1	53.8
53	66.5	55.0
54	67.8	56.3
55	69.2	57.5
56	70.6	58.8
57	72.1	60.1
58	73.5	61.4
59	75.0	62.8
60	76.5	64.1
61	78.0	65.5
62	79.5	66.9
63	81.0	68.3
64	82.6	69.7
65	84.2	71.2
66	85.8	72.7
67	87.4	74.1
68	89.0	75.6
69	90.7	77.2
70	92.3	78.7
71	94.0	80.3
72	95.7	81.8
73	97.5	83.4
74	99.2	85.1
75	101.0	86.7
76	102.8	88.4
77	104.6	90.0
78	106.4	91.7
79	108.3	93.5
80	110.2	95.2
81	112.1	97.0
82	114.0	98.7
83	115.9	100.6
84	117.9	102.4
85	119.9	104.2
86	121.9	106.1
87	123.9	108.0
88	125.9	109.9
89	128.0	111.8
90	130.1	113.8
91	132.2	115.8
92	134.4	117.8
93	136.5	119.8
94	138.7	121.9
95	140.9	123.9
96	143.1	126.0
97	145.4	128.2
98	147.7	130.3
99	150.0	132.5
100	152.3	134.7
101	154.6	136.9
102	157.0	139.1
103	159.4	141.4
104	161.8	143.7
105	164.3	146.0
106	166.8	148.3
107	169.3	150.7
108	171.8	153.1
109	174.3	155.5
110	176.9	158.0
111	179.5	160.4
112	182.1	162.9
113	184.8	165.5
114	187.5	168.0
115	190.2	170.6
116	192.9	173.2
117	195.6	175.8
118	198.4	178.5
119	201.2	181.2
120	204.1	183.9
121	206.9	186.6
122	209.8	189.4
123	212.7	192.2
124	215.7	195.0
125	218.7	197.9
126	221.7	200.8
127	224.7	203.7
128	227.8	206.6
129	230.8	209.6
130	234.0	212.6
131	237.1	215.6
132	240.3	218.7
133	243.5	221.8
134	246.7	224.9
135	250.0	228.1
136	253.3	231.3
137	256.6	234.5
138	259.9	237.7
139	263.3	241.0
140	266.7	244.3
141	270.2	247.7
142	273.6	251.1
143	277.2	254.5
144	280.7	257.9
145	284.3	261.4
146	287.9	264.9
147	291.5	268.5
148	295.1	272.0
149	298.8	275.6
150	302.6	279.3

R-401B saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Liquid bubble, kPa	Vapor dew, kPa
-40	-22.6	-41.9
-39	-18.8	-38.8
-38	-14.8	-35.5
-37	-10.7	-32.2
-36	-6.5	-28.7
-35	-2.1	-25.0
-34	2.5	-21.3
-33	7.3	-17.3
-32	12.2	-13.3
-31	17.3	-9.0
-30	22.5	-4.6
-29	28.0	-0.1
-28	33.6	4.7
-27	39.4	9.5
-26	45.4	14.6
-25	51.7	19.9
-24	58.1	25.3
-23	64.7	30.9
-22	71.5	36.7
-21	78.6	42.8
-20	85.9	49.0
-19	93.3	55.4
-18	101.1	62.0
-17	109.0	68.9
-16	117.2	76.0
-15	125.7	83.3
-14	134.4	90.8
-13	143.3	98.6
-12	152.5	106.6
-11	162.0	114.8
-10	171.7	123.3
-9	181.7	132.1
-8	192.0	141.1
-7	202.6	150.4
-6	213.4	160.0
-5	224.6	169.8
-4	236.0	179.9
-3	247.8	190.3
-2	259.8	201.0
-1	272.2	212.0
0	284.9	223.3
1	297.9	234.9
2	311.2	246.8
3	324.9	259.1
4	338.9	271.6
5	353.3	284.5
6	368.0	297.8
7	383.0	311.3
8	398.5	325.2
9	414.2	339.5
10	430.4	354.1
11	446.9	369.1
12	463.9	384.5
13	481.2	400.3
14	498.9	416.4
15	517.0	432.9
16	535.5	449.8
17	554.4	467.1
18	573.7	484.8
19	593.5	503.0
20	613.7	521.5
21	634.3	540.5
22	655.3	559.9
23	676.8	579.8
24	698.8	600.1
25	721.2	620.8
26	744.0	642.0
27	767.3	663.7
28	791.1	685.8
29	815.4	708.4
30	840.2	731.5
31	865.5	755.1
32	891.2	779.2
33	917.5	803.8
34	944.2	828.9
35	971.5	854.5
36	999.3	880.7
37	1027.6	907.4
38	1056.5	934.6
39	1085.9	962.3
40	1115.9	990.6
41	1146.4	1019.5
42	1177.4	1049.0
43	1209.0	1079.0
44	1241.2	1109.6
45	1274.0	1140.8
46	1307.3	1172.6
47	1341.3	1205.0
48	1375.8	1238.0
49	1411.0	1271.6
50	1446.7	1305.9
51	1483.1	1340.8
52	1520.0	1376.3
53	1557.7	1412.5
54	1595.9	1449.3
55	1634.8	1486.8
56	1674.3	1525.0
57	1714.5	1563.9
58	1755.4	1603.5
59	1796.9	1643.7
60	1839.1	1684.7
61	1881.9	1726.4
62	1925.5	1768.8
63	1969.8	1812.0
64	2014.7	1855.9
65	2060.4	1900.5

Back to the lookup ↑

R-401B PT Chart

°F / psig · Safety class A1 · Zeotropic blend

refrigerantptchart.com

°F	Liquid	Vapor
-40	6.7"	12.4"
-39	6.1"	11.9"
-38	5.4"	11.3"
-37	4.8"	10.8"
-36	4.1"	10.3"
-35	3.4"	9.7"
-34	2.8"	9.2"
-33	2.1"	8.6"
-32	1.3"	8.0"
-31	0.6"	7.4"
-30	0.1	6.8"
-29	0.4	6.2"
-28	0.8	5.5"
-27	1.2	4.9"
-26	1.6	4.2"
-25	2.0	3.5"
-24	2.4	2.8"
-23	2.8	2.1"
-22	3.3	1.4"
-21	3.7	0.6"
-20	4.1	0.1
-19	4.6	0.4
-18	5.1	0.8
-17	5.5	1.2
-16	6.0	1.6
-15	6.5	2.0
-14	7.0	2.5
-13	7.5	2.9
-12	8.0	3.3
-11	8.5	3.8
-10	9.1	4.2
-9	9.6	4.7
-8	10.2	5.1
-7	10.7	5.6
-6	11.3	6.1
-5	11.9	6.6
-4	12.5	7.1
-3	13.1	7.6
-2	13.7	8.1
-1	14.3	8.7
0	14.9	9.2
1	15.6	9.8
2	16.2	10.3
3	16.9	10.9
4	17.5	11.5
5	18.2	12.1
6	18.9	12.7
7	19.6	13.3

°F	Liquid	Vapor
8	20.3	13.9
9	21.1	14.6
10	21.8	15.2
11	22.6	15.9
12	23.3	16.5
13	24.1	17.2
14	24.9	17.9
15	25.7	18.6
16	26.5	19.3
17	27.3	20.0
18	28.2	20.8
19	29.0	21.5
20	29.9	22.3
21	30.8	23.0
22	31.7	23.8
23	32.6	24.6
24	33.5	25.4
25	34.4	26.3
26	35.4	27.1
27	36.3	27.9
28	37.3	28.8
29	38.3	29.7
30	39.3	30.6
31	40.3	31.5
32	41.3	32.4
33	42.4	33.3
34	43.4	34.3
35	44.5	35.2
36	45.6	36.2
37	46.7	37.2
38	47.8	38.2
39	48.9	39.2
40	50.1	40.2
41	51.2	41.3
42	52.4	42.3
43	53.6	43.4
44	54.8	44.5
45	56.0	45.6
46	57.3	46.7
47	58.5	47.9
48	59.8	49.0
49	61.1	50.2
50	62.4	51.4
51	63.8	52.6
52	65.1	53.8
53	66.5	55.0
54	67.8	56.3
55	69.2	57.5

°F	Liquid	Vapor
56	70.6	58.8
57	72.1	60.1
58	73.5	61.4
59	75.0	62.8
60	76.5	64.1
61	78.0	65.5
62	79.5	66.9
63	81.0	68.3
64	82.6	69.7
65	84.2	71.2
66	85.8	72.7
67	87.4	74.1
68	89.0	75.6
69	90.7	77.2
70	92.3	78.7
71	94.0	80.3
72	95.7	81.8
73	97.5	83.4
74	99.2	85.1
75	101.0	86.7
76	102.8	88.4
77	104.6	90.0
78	106.4	91.7
79	108.3	93.5
80	110.2	95.2
81	112.1	97.0
82	114.0	98.7
83	115.9	100.6
84	117.9	102.4
85	119.9	104.2
86	121.9	106.1
87	123.9	108.0
88	125.9	109.9
89	128.0	111.8
90	130.1	113.8
91	132.2	115.8
92	134.4	117.8
93	136.5	119.8
94	138.7	121.9
95	140.9	123.9
96	143.1	126.0
97	145.4	128.2
98	147.7	130.3
99	150.0	132.5
100	152.3	134.7
101	154.6	136.9
102	157.0	139.1
103	159.4	141.4

°F	Liquid	Vapor
104	161.8	143.7
105	164.3	146.0
106	166.8	148.3
107	169.3	150.7
108	171.8	153.1
109	174.3	155.5
110	176.9	158.0
111	179.5	160.4
112	182.1	162.9
113	184.8	165.5
114	187.5	168.0
115	190.2	170.6
116	192.9	173.2
117	195.6	175.8
118	198.4	178.5
119	201.2	181.2
120	204.1	183.9
121	206.9	186.6
122	209.8	189.4
123	212.7	192.2
124	215.7	195.0
125	218.7	197.9
126	221.7	200.8
127	224.7	203.7
128	227.8	206.6
129	230.8	209.6
130	234.0	212.6
131	237.1	215.6
132	240.3	218.7
133	243.5	221.8
134	246.7	224.9
135	250.0	228.1
136	253.3	231.3
137	256.6	234.5
138	259.9	237.7
139	263.3	241.0
140	266.7	244.3
141	270.2	247.7
142	273.6	251.1
143	277.2	254.5
144	280.7	257.9
145	284.3	261.4
146	287.9	264.9
147	291.5	268.5
148	295.1	272.0
149	298.8	275.6
150	302.6	279.3

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

R-401B PT Chart

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

refrigerantptchart.com

°C	Liquid	Vapor
-40	-22.6	-41.9
-39	-18.8	-38.8
-38	-14.8	-35.5
-37	-10.7	-32.2
-36	-6.5	-28.7
-35	-2.1	-25.0
-34	2.5	-21.3
-33	7.3	-17.3
-32	12.2	-13.3
-31	17.3	-9.0
-30	22.5	-4.6
-29	28.0	-0.1
-28	33.6	4.7
-27	39.4	9.5
-26	45.4	14.6
-25	51.7	19.9
-24	58.1	25.3
-23	64.7	30.9
-22	71.5	36.7
-21	78.6	42.8
-20	85.9	49.0
-19	93.3	55.4
-18	101.1	62.0
-17	109.0	68.9
-16	117.2	76.0
-15	125.7	83.3
-14	134.4	90.8
-13	143.3	98.6
-12	152.5	106.6
-11	162.0	114.8
-10	171.7	123.3
-9	181.7	132.1
-8	192.0	141.1
-7	202.6	150.4
-6	213.4	160.0
-5	224.6	169.8

°C	Liquid	Vapor
-4	236.0	179.9
-3	247.8	190.3
-2	259.8	201.0
-1	272.2	212.0
0	284.9	223.3
1	297.9	234.9
2	311.2	246.8
3	324.9	259.1
4	338.9	271.6
5	353.3	284.5
6	368.0	297.8
7	383.0	311.3
8	398.5	325.2
9	414.2	339.5
10	430.4	354.1
11	446.9	369.1
12	463.9	384.5
13	481.2	400.3
14	498.9	416.4
15	517.0	432.9
16	535.5	449.8
17	554.4	467.1
18	573.7	484.8
19	593.5	503.0
20	613.7	521.5
21	634.3	540.5
22	655.3	559.9
23	676.8	579.8
24	698.8	600.1
25	721.2	620.8
26	744.0	642.0
27	767.3	663.7
28	791.1	685.8
29	815.4	708.4
30	840.2	731.5
31	865.5	755.1

°C	Liquid	Vapor
32	891.2	779.2
33	917.5	803.8
34	944.2	828.9
35	971.5	854.5
36	999.3	880.7
37	1027.6	907.4
38	1056.5	934.6
39	1085.9	962.3
40	1115.9	990.6
41	1146.4	1019.5
42	1177.4	1049.0
43	1209.0	1079.0
44	1241.2	1109.6
45	1274.0	1140.8
46	1307.3	1172.6
47	1341.3	1205.0
48	1375.8	1238.0
49	1411.0	1271.6
50	1446.7	1305.9
51	1483.1	1340.8
52	1520.0	1376.3
53	1557.7	1412.5
54	1595.9	1449.3
55	1634.8	1486.8
56	1674.3	1525.0
57	1714.5	1563.9
58	1755.4	1603.5
59	1796.9	1643.7
60	1839.1	1684.7
61	1881.9	1726.4
62	1925.5	1768.8
63	1969.8	1812.0
64	2014.7	1855.9
65	2060.4	1900.5

Liquid = bubble (use for subcooling). Vapor = dew (use for superheat). Negative kPa = vacuum. 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-401B chart

This R-401B 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. Below 0 psig the °F table shows inches of mercury (inHg) vacuum.

Source: manufacturer and supplier charts (Arkema, National Refrigerants). Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-401B pressure at 40 °F?

40.2 psig vapor (dew) and 50.1 psig liquid (bubble) at saturation, from the table above.

What is the R-401B pressure at 100 °F?

134.7 psig vapor (dew) and 152.3 psig liquid (bubble) at saturation.

Which column do I use for superheat and subcooling?

Use vapor (dew) for superheat and liquid (bubble) for subcooling. R-401B has 9.07 °F of glide at a 40 °F evaporator, so the two columns differ.

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R-401B PT Chart

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R-401B pressure temperature table

How to use

About this R-401B chart

FAQ

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