R-12 PT Chart

R-12 saturation pressure, −40 to 150 °F−40 to 65 °C. Used in legacy domestic, auto and commercial systems.

Safety class A1Single component (CFC)No glideNo glide

R-12 (CFC-12) is a CFC. US production and import of CFCs ended on 1 January 1996 (limited exemptions), so systems are serviced from recovered, recycled or previously produced refrigerant. Source: US EPA: Phaseout of Class I Ozone-Depleting Substances.

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Step 3 Temperature

°F°C

Type a temperature to see the saturation pressure.

R-12 pressure temperature table

Below 0 psig: inches of mercury vacuum. Highlighted: 40 °F and 100 °F.Negative kPa = vacuum. Highlighted: 4 °C and 38 °C.

R-12 saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Pressure psig
-40	11.0 inHg
-39	10.5 inHg
-38	10.0 inHg
-37	9.5 inHg
-36	8.9 inHg
-35	8.4 inHg
-34	7.8 inHg
-33	7.3 inHg
-32	6.7 inHg
-31	6.1 inHg
-30	5.5 inHg
-29	4.9 inHg
-28	4.3 inHg
-27	3.7 inHg
-26	3.0 inHg
-25	2.4 inHg
-24	1.7 inHg
-23	1.0 inHg
-22	0.3 inHg
-21	0.2
-20	0.5
-19	0.9
-18	1.3
-17	1.7
-16	2.0
-15	2.4
-14	2.8
-13	3.2
-12	3.6
-11	4.0
-10	4.5
-9	4.9
-8	5.3
-7	5.8
-6	6.2
-5	6.7
-4	7.2
-3	7.6
-2	8.1
-1	8.6
0	9.1
1	9.6
2	10.1
3	10.7
4	11.2
5	11.7
6	12.3
7	12.9
8	13.4
9	14.0
10	14.6
11	15.2
12	15.8
13	16.4
14	17.0
15	17.7
16	18.3
17	19.0
18	19.6
19	20.3
20	21.0
21	21.7
22	22.4
23	23.1
24	23.8
25	24.6
26	25.3
27	26.1
28	26.8
29	27.6
30	28.4
31	29.2
32	30.0
33	30.8
34	31.7
35	32.5
36	33.4
37	34.2
38	35.1
39	36.0
40	36.9
41	37.8
42	38.7
43	39.7
44	40.6
45	41.6
46	42.6
47	43.6
48	44.6
49	45.6
50	46.6
51	47.6
52	48.7
53	49.8
54	50.9
55	51.9
56	53.1
57	54.2
58	55.3
59	56.5
60	57.6
61	58.8
62	60.0
63	61.2
64	62.4
65	63.7
66	64.9
67	66.2
68	67.5
69	68.8
70	70.1
71	71.4
72	72.7
73	74.1
74	75.5
75	76.8
76	78.2
77	79.7
78	81.1
79	82.5
80	84.0
81	85.5
82	87.0
83	88.5
84	90.0
85	91.6
86	93.2
87	94.7
88	96.3
89	98.0
90	99.6
91	101.3
92	102.9
93	104.6
94	106.3
95	108.0
96	109.8
97	111.5
98	113.3
99	115.1
100	116.9
101	118.8
102	120.6
103	122.5
104	124.4
105	126.3
106	128.2
107	130.2
108	132.1
109	134.1
110	136.1
111	138.1
112	140.2
113	142.2
114	144.3
115	146.4
116	148.6
117	150.7
118	152.9
119	155.1
120	157.3
121	159.5
122	161.8
123	164.0
124	166.3
125	168.6
126	171.0
127	173.3
128	175.7
129	178.1
130	180.5
131	183.0
132	185.5
133	188.0
134	190.5
135	193.0
136	195.6
137	198.2
138	200.8
139	203.4
140	206.0
141	208.7
142	211.4
143	214.1
144	216.9
145	219.7
146	222.5
147	225.3
148	228.1
149	231.0
150	233.9

R-12 saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Pressure kPa
-40	-37.2
-39	-34.2
-38	-31.0
-37	-27.7
-36	-24.3
-35	-20.7
-34	-17.1
-33	-13.3
-32	-9.3
-31	-5.3
-30	-1.1
-29	3.3
-28	7.8
-27	12.4
-26	17.2
-25	22.2
-24	27.3
-23	32.6
-22	38.0
-21	43.6
-20	49.4
-19	55.3
-18	61.5
-17	67.8
-16	74.3
-15	81.0
-14	87.9
-13	95.0
-12	102.3
-11	109.8
-10	117.5
-9	125.4
-8	133.5
-7	141.9
-6	150.4
-5	159.2
-4	168.3
-3	177.6
-2	187.1
-1	196.8
0	206.8
1	217.1
2	227.6
3	238.4
4	249.4
5	260.7
6	272.3
7	284.1
8	296.2
9	308.6
10	321.3
11	334.3
12	347.6
13	361.2
14	375.1
15	389.3
16	403.8
17	418.6
18	433.8
19	449.3
20	465.1
21	481.2
22	497.7
23	514.5
24	531.7
25	549.2
26	567.1
27	585.4
28	604.0
29	623.0
30	642.3
31	662.1
32	682.2
33	702.7
34	723.6
35	744.9
36	766.6
37	788.7
38	811.2
39	834.1
40	857.5
41	881.3
42	905.5
43	930.1
44	955.2
45	980.8
46	1006.7
47	1033.2
48	1060.1
49	1087.4
50	1115.3
51	1143.6
52	1172.4
53	1201.7
54	1231.4
55	1261.7
56	1292.4
57	1323.7
58	1355.5
59	1387.8
60	1420.6
61	1454.0
62	1487.9
63	1522.3
64	1557.3
65	1592.8

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R-12 PT Chart

°F / psig · Safety class A1 · Single component (CFC)

refrigerantptchart.com

°F	psig
-40	11.0"
-39	10.5"
-38	10.0"
-37	9.5"
-36	8.9"
-35	8.4"
-34	7.8"
-33	7.3"
-32	6.7"
-31	6.1"
-30	5.5"
-29	4.9"
-28	4.3"
-27	3.7"
-26	3.0"
-25	2.4"
-24	1.7"
-23	1.0"
-22	0.3"
-21	0.2
-20	0.5
-19	0.9
-18	1.3
-17	1.7
-16	2.0
-15	2.4
-14	2.8
-13	3.2
-12	3.6
-11	4.0
-10	4.5
-9	4.9
-8	5.3
-7	5.8
-6	6.2
-5	6.7
-4	7.2
-3	7.6
-2	8.1
-1	8.6
0	9.1
1	9.6
2	10.1
3	10.7
4	11.2
5	11.7
6	12.3
7	12.9

°F	psig
8	13.4
9	14.0
10	14.6
11	15.2
12	15.8
13	16.4
14	17.0
15	17.7
16	18.3
17	19.0
18	19.6
19	20.3
20	21.0
21	21.7
22	22.4
23	23.1
24	23.8
25	24.6
26	25.3
27	26.1
28	26.8
29	27.6
30	28.4
31	29.2
32	30.0
33	30.8
34	31.7
35	32.5
36	33.4
37	34.2
38	35.1
39	36.0
40	36.9
41	37.8
42	38.7
43	39.7
44	40.6
45	41.6
46	42.6
47	43.6
48	44.6
49	45.6
50	46.6
51	47.6
52	48.7
53	49.8
54	50.9
55	51.9

°F	psig
56	53.1
57	54.2
58	55.3
59	56.5
60	57.6
61	58.8
62	60.0
63	61.2
64	62.4
65	63.7
66	64.9
67	66.2
68	67.5
69	68.8
70	70.1
71	71.4
72	72.7
73	74.1
74	75.5
75	76.8
76	78.2
77	79.7
78	81.1
79	82.5
80	84.0
81	85.5
82	87.0
83	88.5
84	90.0
85	91.6
86	93.2
87	94.7
88	96.3
89	98.0
90	99.6
91	101.3
92	102.9
93	104.6
94	106.3
95	108.0
96	109.8
97	111.5
98	113.3
99	115.1
100	116.9
101	118.8
102	120.6
103	122.5

°F	psig
104	124.4
105	126.3
106	128.2
107	130.2
108	132.1
109	134.1
110	136.1
111	138.1
112	140.2
113	142.2
114	144.3
115	146.4
116	148.6
117	150.7
118	152.9
119	155.1
120	157.3
121	159.5
122	161.8
123	164.0
124	166.3
125	168.6
126	171.0
127	173.3
128	175.7
129	178.1
130	180.5
131	183.0
132	185.5
133	188.0
134	190.5
135	193.0
136	195.6
137	198.2
138	200.8
139	203.4
140	206.0
141	208.7
142	211.4
143	214.1
144	216.9
145	219.7
146	222.5
147	225.3
148	228.1
149	231.0
150	233.9

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-12 PT Chart

°C / kPa (gauge) · Safety class A1 · Single component (CFC)

refrigerantptchart.com

°C	kPa
-40	-37.2
-39	-34.2
-38	-31.0
-37	-27.7
-36	-24.3
-35	-20.7
-34	-17.1
-33	-13.3
-32	-9.3
-31	-5.3
-30	-1.1
-29	3.3
-28	7.8
-27	12.4
-26	17.2
-25	22.2
-24	27.3
-23	32.6
-22	38.0
-21	43.6
-20	49.4
-19	55.3
-18	61.5
-17	67.8
-16	74.3
-15	81.0
-14	87.9
-13	95.0
-12	102.3
-11	109.8
-10	117.5
-9	125.4
-8	133.5
-7	141.9
-6	150.4
-5	159.2

°C	kPa
-4	168.3
-3	177.6
-2	187.1
-1	196.8
0	206.8
1	217.1
2	227.6
3	238.4
4	249.4
5	260.7
6	272.3
7	284.1
8	296.2
9	308.6
10	321.3
11	334.3
12	347.6
13	361.2
14	375.1
15	389.3
16	403.8
17	418.6
18	433.8
19	449.3
20	465.1
21	481.2
22	497.7
23	514.5
24	531.7
25	549.2
26	567.1
27	585.4
28	604.0
29	623.0
30	642.3
31	662.1

°C	kPa
32	682.2
33	702.7
34	723.6
35	744.9
36	766.6
37	788.7
38	811.2
39	834.1
40	857.5
41	881.3
42	905.5
43	930.1
44	955.2
45	980.8
46	1006.7
47	1033.2
48	1060.1
49	1087.4
50	1115.3
51	1143.6
52	1172.4
53	1201.7
54	1231.4
55	1261.7
56	1292.4
57	1323.7
58	1355.5
59	1387.8
60	1420.6
61	1454.0
62	1487.9
63	1522.3
64	1557.3
65	1592.8

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-12 chart

This R-12 pressure temperature chart gives the saturation pressure for every degree, in psig with °F or kPa (gauge) with °C. Below 0 psig the °F table shows inches of mercury (inHg) vacuum.

Source: supplier chart (National Refrigerants), checked against NIST. Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-12 pressure at 40 °F?

36.9 psig at saturation, from the table above.

What is the R-12 pressure at 100 °F?

116.9 psig at saturation.

Does R-12 have glide?

No. R-12 is a single-component refrigerant, so one saturation pressure works for both superheat and subcooling.

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R-12 PT Chart

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