HVAC Toolkit

Pressure-Temperature Charts

Saturation P-T data for common refrigerants

Select Refrigerant

HFC / HCFC

R-22 R-32 R-125 R-134a R-143a R-404A Z R-407C Z R-410A R-507A

Low GWP (HFO)

R-449A Z R-454B Z Low GWP R-513A R-1234yf Low GWP R-1234ze(E) Low GWP

Natural

R-290 (Propane) Low GWP R-600a (Isobutane) Low GWP R-744 (CO2) Low GWP R-717 (NH3) Low GWP

Pressure Unit

psig kPa bar kgf/cm²

R-290

Pure
GWP: 3
ODP: 0
Safety Class: A3

Natural refrigerant with ultra-low GWP. Used in small commercial refrigeration and domestic applications (charge limits apply per IEC 60335-2-89).

A3 HIGHLY FLAMMABLE - Safety Warning

  • ASHRAE 34 Classification: A3 - Non-toxic but HIGHLY FLAMMABLE
  • Maximum charge limits: 150g (sealed systems) per IEC 60335-2-89
  • Use only explosion-proof equipment and tools
  • Work in well-ventilated areas - gas is heavier than air
  • No open flames, sparks, or hot surfaces during service
  • Use hydrocarbon-rated recovery equipment and leak detectors
  • Install gas detection equipment per local codes
Flammability Range: LEL 2.1% - UEL 9.5% in air

Quick P-T Lookup

psig

* Results are interpolated from the P-T table data

Pressure Units: psig = Gauge pressure (relative to atmosphere) kPa / bar / kgf/cm² = Absolute pressure

°C °F psig
-50 -58 -9.2
-45 -49 -6.4
-40 -40 -3.1
-35 -31 0.8
-30 -22 5.4
-25 -13 10.7
-20 -4 16.8
-15 5 23.8
-10 14 31.8
-5 23 40.8
0 32 51.0
5 41 62.4
10 50 75.1
15 59 89.2
20 68 104.8
25 77 121.9
30 86 140.7
35 95 161.4
40 104 183.9
45 113 208.4
50 122 235.0
55 131 263.9
60 140 295.1
65 149 328.8
70 158 365.1
75 167 404.1
80 176 446.0
85 185 490.8
90 194 538.8