R-438A PT Chart

R-438A saturation pressure, −40 to 148 °F−40 to 64 °C. Used in R-22 retrofits (MO99).

How to use ↓

Safety class A1Zeotropic blendGlide 9.59 °F at 40 °F evapGlide 5.33 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-438A 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.

The table covers −40 to 148 °F−40 to 64 °C only: the published manufacturer data stops there, and the table is not extrapolated past it.

R-438A saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Liquid bubble, psig	Vapor dew, psig
-40	1.7	5.2 inHg
-39	2.1	4.5 inHg
-38	2.6	3.8 inHg
-37	3.0	3.1 inHg
-36	3.5	2.3 inHg
-35	3.9	1.6 inHg
-34	4.4	0.8 inHg
-33	4.9	0.0
-32	5.4	0.4
-31	5.9	0.8
-30	6.4	1.2
-29	6.9	1.7
-28	7.4	2.1
-27	8.0	2.5
-26	8.5	3.0
-25	9.1	3.5
-24	9.6	3.9
-23	10.2	4.4
-22	10.8	4.9
-21	11.4	5.4
-20	12.0	5.9
-19	12.7	6.4
-18	13.3	7.0
-17	13.9	7.5
-16	14.6	8.1
-15	15.3	8.6
-14	16.0	9.2
-13	16.7	9.8
-12	17.4	10.4
-11	18.1	11.0
-10	18.8	11.6
-9	19.6	12.3
-8	20.3	12.9
-7	21.1	13.6
-6	21.9	14.2
-5	22.7	14.9
-4	23.5	15.6
-3	24.3	16.3
-2	25.1	17.0
-1	26.0	17.7
0	26.8	18.5
1	27.7	19.2
2	28.6	20.0
3	29.5	20.8
4	30.4	21.6
5	31.4	22.4
6	32.3	23.2
7	33.3	24.0
8	34.3	24.9
9	35.3	25.7
10	36.3	26.6
11	37.3	27.5
12	38.3	28.4
13	39.4	29.4
14	40.5	30.3
15	41.6	31.2
16	42.7	32.2
17	43.8	33.2
18	44.9	34.2
19	46.1	35.2
20	47.3	36.2
21	48.4	37.3
22	49.6	38.3
23	50.9	39.4
24	52.1	40.5
25	53.4	41.6
26	54.6	42.8
27	55.9	43.9
28	57.3	45.1
29	58.6	46.3
30	59.9	47.5
31	61.3	48.7
32	62.7	49.9
33	64.1	51.2
34	65.5	52.5
35	67.0	53.7
36	68.4	55.1
37	69.9	56.4
38	71.4	57.7
39	72.9	59.1
40	74.5	60.5
41	76.0	61.9
42	77.6	63.3
43	79.2	64.8
44	80.9	66.2
45	82.5	67.7
46	84.2	69.2
47	85.9	70.8
48	87.6	72.3
49	89.3	73.9
50	91.0	75.5
51	92.8	77.1
52	94.6	78.7
53	96.4	80.4
54	98.3	82.1
55	100.2	83.8
56	102.0	85.5
57	104.0	87.3
58	105.9	89.0
59	107.8	90.8
60	109.8	92.7
61	111.8	94.5
62	113.9	96.4
63	115.9	98.3
64	118.0	100.2
65	120.1	102.1
66	122.2	104.1
67	124.4	106.1
68	126.5	108.1
69	128.8	110.1
70	131.0	112.2
71	133.2	114.3
72	135.5	116.4
73	137.8	118.6
74	140.1	120.7
75	142.5	122.9
76	144.9	125.2
77	147.3	127.4
78	149.7	129.7
79	152.2	132.0
80	154.7	134.3
81	157.2	136.7
82	159.8	139.1
83	162.3	141.5
84	164.9	144.0
85	167.6	146.4
86	170.2	148.9
87	172.9	151.5
88	175.6	154.0
89	178.4	156.6
90	181.2	159.3
91	184.0	161.9
92	186.8	164.6
93	189.7	167.3
94	192.6	170.1
95	195.5	172.9
96	198.4	175.7
97	201.4	178.5
98	204.4	181.4
99	207.5	184.3
100	210.6	187.2
101	213.7	190.2
102	216.8	193.2
103	220.0	196.3
104	223.2	199.3
105	226.4	202.4
106	229.7	205.6
107	233.0	208.8
108	236.3	212.0
109	239.7	215.2
110	243.1	218.5
111	246.6	221.8
112	250.0	225.2
113	253.5	228.6
114	257.1	232.0
115	260.6	235.5
116	264.2	239.0
117	267.9	242.5
118	271.6	246.1
119	275.3	249.7
120	279.0	253.4
121	282.8	257.1
122	286.6	260.8
123	290.5	264.6
124	294.4	268.4
125	298.3	272.2
126	302.3	276.1
127	306.3	280.1
128	310.3	284.0
129	314.4	288.0
130	318.5	292.1
131	322.7	296.2
132	326.9	300.3
133	331.1	304.5
134	335.4	308.7
135	339.7	313.0
136	344.0	317.3
137	348.4	321.7
138	352.8	326.1
139	357.3	330.5
140	361.8	335.0
141	366.3	339.5
142	370.9	344.1
143	375.6	348.7
144	380.2	353.4
145	384.9	358.1
146	389.7	362.9
147	394.5	367.7
148	399.3	372.5

R-438A saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Liquid bubble, kPa	Vapor dew, kPa
-40	11.7	-17.7
-39	17.0	-13.4
-38	22.5	-8.9
-37	28.3	-4.3
-36	34.2	0.6
-35	40.4	5.6
-34	46.8	10.9
-33	53.4	16.3
-32	60.2	21.9
-31	67.3	27.8
-30	74.6	33.8
-29	82.1	40.1
-28	89.9	46.6
-27	98.0	53.4
-26	106.3	60.3
-25	114.8	67.6
-24	123.7	75.0
-23	132.8	82.7
-22	142.2	90.7
-21	151.9	99.0
-20	161.9	107.5
-19	172.1	116.3
-18	182.7	125.3
-17	193.6	134.7
-16	204.8	144.3
-15	216.3	154.3
-14	228.2	164.6
-13	240.4	175.1
-12	252.9	186.0
-11	265.8	197.3
-10	279.1	208.8
-9	292.7	220.7
-8	306.6	233.0
-7	320.9	245.6
-6	335.7	258.5
-5	350.7	271.8
-4	366.2	285.5
-3	382.1	299.6
-2	398.4	314.1
-1	415.1	329.0
0	432.2	344.2
1	449.8	359.9
2	467.7	376.0
3	486.1	392.5
4	505.0	409.4
5	524.3	426.8
6	544.0	444.6
7	564.3	462.9
8	584.9	481.6
9	606.1	500.8
10	627.8	520.5
11	649.9	540.7
12	672.6	561.3
13	695.7	582.5
14	719.4	604.2
15	743.6	626.4
16	768.3	649.1
17	793.5	672.3
18	819.3	696.1
19	845.6	720.4
20	872.5	745.3
21	900.0	770.8
22	928.0	796.8
23	956.6	823.4
24	985.8	850.6
25	1015.6	878.4
26	1046.0	906.9
27	1077.0	935.9
28	1108.6	965.6
29	1140.8	995.9
30	1173.7	1026.9
31	1207.2	1058.5
32	1241.3	1090.8
33	1276.2	1123.8
34	1311.6	1157.4
35	1347.8	1191.8
36	1384.6	1226.8
37	1422.1	1262.6
38	1460.3	1299.1
39	1499.3	1336.4
40	1538.9	1374.4
41	1579.2	1413.2
42	1620.3	1452.7
43	1662.1	1493.0
44	1704.7	1534.1
45	1748.0	1576.1
46	1792.1	1618.8
47	1837.0	1662.4
48	1882.6	1706.8
49	1929.0	1752.0
50	1976.3	1798.2
51	2024.3	1845.2
52	2073.2	1893.1
53	2122.8	1941.8
54	2173.3	1991.6
55	2224.7	2042.2
56	2276.9	2093.8
57	2330.0	2146.3
58	2384.0	2199.8
59	2438.8	2254.3
60	2494.5	2309.7
61	2551.1	2366.2
62	2608.7	2423.7
63	2667.1	2482.2
64	2726.5	2541.8

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R-438A PT Chart

°F / psig · Safety class A1 · Zeotropic blend

refrigerantptchart.com

°F	Liquid	Vapor
-40	1.7	5.2"
-39	2.1	4.5"
-38	2.6	3.8"
-37	3.0	3.1"
-36	3.5	2.3"
-35	3.9	1.6"
-34	4.4	0.8"
-33	4.9	0.0
-32	5.4	0.4
-31	5.9	0.8
-30	6.4	1.2
-29	6.9	1.7
-28	7.4	2.1
-27	8.0	2.5
-26	8.5	3.0
-25	9.1	3.5
-24	9.6	3.9
-23	10.2	4.4
-22	10.8	4.9
-21	11.4	5.4
-20	12.0	5.9
-19	12.7	6.4
-18	13.3	7.0
-17	13.9	7.5
-16	14.6	8.1
-15	15.3	8.6
-14	16.0	9.2
-13	16.7	9.8
-12	17.4	10.4
-11	18.1	11.0
-10	18.8	11.6
-9	19.6	12.3
-8	20.3	12.9
-7	21.1	13.6
-6	21.9	14.2
-5	22.7	14.9
-4	23.5	15.6
-3	24.3	16.3
-2	25.1	17.0
-1	26.0	17.7
0	26.8	18.5
1	27.7	19.2
2	28.6	20.0
3	29.5	20.8
4	30.4	21.6
5	31.4	22.4
6	32.3	23.2
7	33.3	24.0

°F	Liquid	Vapor
8	34.3	24.9
9	35.3	25.7
10	36.3	26.6
11	37.3	27.5
12	38.3	28.4
13	39.4	29.4
14	40.5	30.3
15	41.6	31.2
16	42.7	32.2
17	43.8	33.2
18	44.9	34.2
19	46.1	35.2
20	47.3	36.2
21	48.4	37.3
22	49.6	38.3
23	50.9	39.4
24	52.1	40.5
25	53.4	41.6
26	54.6	42.8
27	55.9	43.9
28	57.3	45.1
29	58.6	46.3
30	59.9	47.5
31	61.3	48.7
32	62.7	49.9
33	64.1	51.2
34	65.5	52.5
35	67.0	53.7
36	68.4	55.1
37	69.9	56.4
38	71.4	57.7
39	72.9	59.1
40	74.5	60.5
41	76.0	61.9
42	77.6	63.3
43	79.2	64.8
44	80.9	66.2
45	82.5	67.7
46	84.2	69.2
47	85.9	70.8
48	87.6	72.3
49	89.3	73.9
50	91.0	75.5
51	92.8	77.1
52	94.6	78.7
53	96.4	80.4
54	98.3	82.1
55	100.2	83.8

°F	Liquid	Vapor
56	102.0	85.5
57	104.0	87.3
58	105.9	89.0
59	107.8	90.8
60	109.8	92.7
61	111.8	94.5
62	113.9	96.4
63	115.9	98.3
64	118.0	100.2
65	120.1	102.1
66	122.2	104.1
67	124.4	106.1
68	126.5	108.1
69	128.8	110.1
70	131.0	112.2
71	133.2	114.3
72	135.5	116.4
73	137.8	118.6
74	140.1	120.7
75	142.5	122.9
76	144.9	125.2
77	147.3	127.4
78	149.7	129.7
79	152.2	132.0
80	154.7	134.3
81	157.2	136.7
82	159.8	139.1
83	162.3	141.5
84	164.9	144.0
85	167.6	146.4
86	170.2	148.9
87	172.9	151.5
88	175.6	154.0
89	178.4	156.6
90	181.2	159.3
91	184.0	161.9
92	186.8	164.6
93	189.7	167.3
94	192.6	170.1
95	195.5	172.9
96	198.4	175.7
97	201.4	178.5
98	204.4	181.4
99	207.5	184.3
100	210.6	187.2
101	213.7	190.2
102	216.8	193.2
103	220.0	196.3

°F	Liquid	Vapor
104	223.2	199.3
105	226.4	202.4
106	229.7	205.6
107	233.0	208.8
108	236.3	212.0
109	239.7	215.2
110	243.1	218.5
111	246.6	221.8
112	250.0	225.2
113	253.5	228.6
114	257.1	232.0
115	260.6	235.5
116	264.2	239.0
117	267.9	242.5
118	271.6	246.1
119	275.3	249.7
120	279.0	253.4
121	282.8	257.1
122	286.6	260.8
123	290.5	264.6
124	294.4	268.4
125	298.3	272.2
126	302.3	276.1
127	306.3	280.1
128	310.3	284.0
129	314.4	288.0
130	318.5	292.1
131	322.7	296.2
132	326.9	300.3
133	331.1	304.5
134	335.4	308.7
135	339.7	313.0
136	344.0	317.3
137	348.4	321.7
138	352.8	326.1
139	357.3	330.5
140	361.8	335.0
141	366.3	339.5
142	370.9	344.1
143	375.6	348.7
144	380.2	353.4
145	384.9	358.1
146	389.7	362.9
147	394.5	367.7
148	399.3	372.5

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-438A PT Chart

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

refrigerantptchart.com

°C	Liquid	Vapor
-40	11.7	-17.7
-39	17.0	-13.4
-38	22.5	-8.9
-37	28.3	-4.3
-36	34.2	0.6
-35	40.4	5.6
-34	46.8	10.9
-33	53.4	16.3
-32	60.2	21.9
-31	67.3	27.8
-30	74.6	33.8
-29	82.1	40.1
-28	89.9	46.6
-27	98.0	53.4
-26	106.3	60.3
-25	114.8	67.6
-24	123.7	75.0
-23	132.8	82.7
-22	142.2	90.7
-21	151.9	99.0
-20	161.9	107.5
-19	172.1	116.3
-18	182.7	125.3
-17	193.6	134.7
-16	204.8	144.3
-15	216.3	154.3
-14	228.2	164.6
-13	240.4	175.1
-12	252.9	186.0
-11	265.8	197.3
-10	279.1	208.8
-9	292.7	220.7
-8	306.6	233.0
-7	320.9	245.6
-6	335.7	258.5

°C	Liquid	Vapor
-5	350.7	271.8
-4	366.2	285.5
-3	382.1	299.6
-2	398.4	314.1
-1	415.1	329.0
0	432.2	344.2
1	449.8	359.9
2	467.7	376.0
3	486.1	392.5
4	505.0	409.4
5	524.3	426.8
6	544.0	444.6
7	564.3	462.9
8	584.9	481.6
9	606.1	500.8
10	627.8	520.5
11	649.9	540.7
12	672.6	561.3
13	695.7	582.5
14	719.4	604.2
15	743.6	626.4
16	768.3	649.1
17	793.5	672.3
18	819.3	696.1
19	845.6	720.4
20	872.5	745.3
21	900.0	770.8
22	928.0	796.8
23	956.6	823.4
24	985.8	850.6
25	1015.6	878.4
26	1046.0	906.9
27	1077.0	935.9
28	1108.6	965.6
29	1140.8	995.9

°C	Liquid	Vapor
30	1173.7	1026.9
31	1207.2	1058.5
32	1241.3	1090.8
33	1276.2	1123.8
34	1311.6	1157.4
35	1347.8	1191.8
36	1384.6	1226.8
37	1422.1	1262.6
38	1460.3	1299.1
39	1499.3	1336.4
40	1538.9	1374.4
41	1579.2	1413.2
42	1620.3	1452.7
43	1662.1	1493.0
44	1704.7	1534.1
45	1748.0	1576.1
46	1792.1	1618.8
47	1837.0	1662.4
48	1882.6	1706.8
49	1929.0	1752.0
50	1976.3	1798.2
51	2024.3	1845.2
52	2073.2	1893.1
53	2122.8	1941.8
54	2173.3	1991.6
55	2224.7	2042.2
56	2276.9	2093.8
57	2330.0	2146.3
58	2384.0	2199.8
59	2438.8	2254.3
60	2494.5	2309.7
61	2551.1	2366.2
62	2608.7	2423.7
63	2667.1	2482.2
64	2726.5	2541.8

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-438A chart

This R-438A 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 charts (Chemours). Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-438A pressure at 40 °F?

60.5 psig vapor (dew) and 74.5 psig liquid (bubble) at saturation, from the table above.

What is the R-438A pressure at 100 °F?

187.2 psig vapor (dew) and 210.6 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-438A has 9.59 °F of glide at a 40 °F evaporator, so the two columns differ.

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R-438A PT Chart

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R-438A pressure temperature table

How to use

About this R-438A chart

FAQ

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