Physical Properties

A-17

A-31

A-108

Iso Pentane

n-Pentane

DME

152a

134a

Formula

C4H10

C4H10

C3H8

C5H12

C5H12

CH3-O-CH3

CH3-CHF2

CF3-CFH2

Molecular Weight

58.123

58.123

44.096

72.15

72.15

46.069

66.051

102.03

Vapor pressure @ 70 °F (psig)

16.9

31.1

109.3

-3.1

-6.2

61.3

63.9

71.0

Vapor Pressure @ 100 °F (psig)

37.5

59.0

172.0

5.8

0.8

106.0

111.1

124.2

Boiling Point @ 1 ATM,. °F

31.1

10.9

-43.7

82

97

-12.7

-13

-15.5

Freezing Point @ 1 ATM., °F

-217.0

-255.3

-305.7

-255.8

-201.5

-223

-179

-149.8

AutoIgnition Temperature °F

761

1010

842

–

588

662

849

–

Specific Gravity Liquid @ 60 °F

0.584

0.563

0.508

0.624

0.630

0.671

0.922

1.245

Specific Gravity Gas @ 60 °F

2.006

2.006

1.522

2.491

2.491

1.590

2.280

3.523

Density of Liquid lbs./gal. @ 60 °F

4.864

4.699

4.234

5.200

5.255

5.579

7.696

10.384

Vol. of Vapor/lb. @ 60 °F (cu. ft.)

6.54

6.53

8.62

5.27

5.27

8.24

5.74

3.72

Vol. of Vapor/gal. @ 60 °F (cu. ft.)

31.75

30.59

36.35

27.40

27.68

46.12

44.20

38.64

Gas Vol/Liq Vol @ 1 ATM & 60 °F

237.8

229.3

272.7

205.0

207.0

345.0

330.6

289.0

Critical Temperature °F

305.6

274.5

206.1

369.1

385.8

260.3

236.2

213.9

Critical Pressure (psia)

550.6

527.9

616

490.4

488.8

778.9

652.5

587.4

Flash Point °F

-101

-117

-156

-60

-40

-42

-58

–

Spc Heat of Gas, Cp @ 60 °F, BTU/lb °F

0.395

0.387

0.389

0.384

0.388

0.412

0.240

0.282

Spc Heat of Liquid, Cp @ 60°F, BTU/lb °F

0.570

0.570

0.620

0.538

0.544

0.566

0.378

0.331

Heat of Vaporization, BTU/lb °F @ BP

165.8

157.2

183.0

147.1

153.6

201.0

140.9

93.4

Net Heat of Combustion of Liquid at 77 °F (BTU/lb)

19,657

19,589

19,918

19,304

19,495

12,397

4,937

0

Chemical Heat of Combustion (kJ/g)

43.3

42.8

44.0

41.9

42.5

26.5

6.3

0

Viscosity of Liq., centipoise @ 100 °F

0.140

0.131

0.084

0.191

0.196

0.115

0.141

0.166

Coefficient of Liquid Expansion @ 60 °F

0.0011

0.0012

0.0016

0.0009

0.0009

0.0012

0.0014

0.0016

Solubility in water @ 70 °F (% by wgt)

0.008

0.008

0.007

Neg.

Neg.

35.0

1.7

0.95

Solubility of water @ 70 °F (% by wgt)

0.007

0.008

0.016

0.01

0.009

6.9

0.17

0.095

Surface Tension @ 77 ° F (dynes/cm)

11.9

9.8

7.0

14.5

15.5

11.4

10.0

7.8

Kauri-Butanol Value

20

18

15

N/A

N/A

60

11

9.2

Flammability Limits in Air

1.9 – 8.5

1.8 – 8.4

2.2 – 9.5

1.4 – 7.6

1.5 – 7.8

3.3 – 18.0

3.9 – 16.9

–