HP 152aAerosol Propellant

Physical Properties of HP 152a and Isobutane Mixtures

Technical Information
For the full range of HP 152a/I compositions, thisFigure 1. Saturated Vapor Pressure of HP 152/I at 70°F—

bulletin presents the saturated vapor pressures andExperimental Dataliquid densities from 70°F to 130°F (21.1°C to 54.4°C)
and flammability data for the vapor mixtures in air.

100

The saturated vapor pressure data for HP 152a/I are shown in

Data Sources
This Study
Ref. 1
Ref. 190Figures 1–4 and Table 1. The graphs are based on literature
data for the pure components (Ref. 1) and experimental data
80

vapor pressures for the HP 152a/I blends at 70°F and 130°F,
reveal that HP 152a and isobutane form an azeotropic
mixture containing 70 weight percent HP 152a at 70°F and77 weight percent HP 152a at 130°F.

Pressure, psia

given in Table 1. Figures 1 and 2, which show the saturated

7060

Figure 5 and Table 2 show the liquid densities that werecalculated from pure component data (Ref. 1). The
flammability of HP 152a/I vapor mixtures in air is shown in50

Figure 6 and Table 3. These data are based on literature
values for the pure components (Ref. 2 and 3) andexperimental values for a 50/50 mole percent(53.25/46.75 wt %) HP 152a/I mixture.

References
1. ASHRAE, Handbook of Fundamentals, 1972.
2. Bulletin 503, Bureau of Mines, “Limits of Flammability ofGases and Vapors”.
3. Handbook of Aerosol Technology, P.A. Sanders, Van
Nostrand Reinhold Company, 1979.

400204060
HP 152a in Mixture, wt %80100

HP 152aAerosol Propellant

Figure 2. Saturated Vapor Pressure of HP 152/I at 130°F—

Figure 4. Saturated Vapor Pressures of HP 152/I Mixtures

Experimental Data
Data Sources
This Study
Ref. 1Ref. 1200Pressure, psia

Pressure, psia

180160140100908070

HP 152a, wt %2008090100300

2206050403020120

1000204060
HP 152a in Mixture, wt %

80

100

10010203040506070

Temperature, °C

Figure 3. Saturated Vapor Pressures of HP 152/I Mixtures
3007050403020200

100Note: Data based on pure component data plus shown experimental points (–)
Note: A 70 wt % HP 152 line falls at or just below the 80 wt % line. A 70 wt % HP 152
mixture has a pressure of 44.6 psia at 0°C and 288.7 psia at 70°C. The azeotropic
mixture contains 70 wt % HP 152 at 70°F and 77 wt % HP 152 at 130°F.

Table 1. Saturated Vapor Pressures of HP 152/I Mixtures—

HP 152a, wt %Pressure, psia

Experimental Data
10090807060
50
4077°F (25°C)

130°F (54.4°C)

0*

45.1

109.7

15.0

66.7

152.2

33.0

77.7

181.4

50.0

83.1

195.1

67.0

85.9

203.7

80.0

85.1

204.5

90.0

83.0

201.3

100.0*

77.2

191.5

302010010203040

Temperature, °C5060

70Pressure, psia

HP 152 in Propellant
Mixture, wt %*Ref. 1

HP 152aAerosol Propellant

Figure 5. Liquid Densities of HP 152/I Mixtures

Figure 6. Flammability Limits of HP 152/I Mixtures

0.95

2018HP 152/I Mixture Vapors in Air, volume %

0.90
0.85

Density, g/cc

0.80
0.75
0.70
°F

70F

°00

0.65

1F°
30

10.60

161412108
Flammable
Zone

640.550.50

Data Sources
This Study
Ref. 3
Ref. 220204060
HP 152a, wt %80

0100

020406080
HP 152a in HP 152a/I Mixture, wt %100Note: Data calculated from pure component densities.

Table 2. Calculated Liquid Densities of HP152/I Mixtures

Concentration of HP 152 in
HP 152/I Mixture

Densities, g/cc at

HP 152 inMixture, wt %

70°F

100°F

130°F

0*

0.55590.53470.5117200.6027

0.57900.5529400.6582

0.63120.601460

0.72480.69380.6592800.8065

0.77020.7293100*

Table 3. Flammability Limits of HP 152/I Vapor Mixtures in Air

0.90900.86550.8161

Weight, %Mole, %Lower

Upper

0.0a

0.0

1.8

8.4

53.25

50.0

2.7 ± 0.1

11.5 ± 0.1

100.0

100.0

3.9

16.9

ba

Flammability Limits in Air, vol %Ref. 2Ref. 3b*Ref. 1

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