Commercial
Butane

Commercial
Propane

Relative density of liquid at 15 ƒC

0,57 to 0,58

0,50 to 0,51

Imperial gallons/ton at 15 ƒC

385 to 393

439 to 448

Litre/tonne at 15 ƒC

1 723 to 1 760

1 965 to 2 019

Relative density of gas compared with air at 15 ƒC and 1 013,25 mbar

1,90 to 2,10

1,40 to 1,55

Volume of gas (litres) per kg of liquid at 15 ƒC and 1 013,25 mbar

406 to 431

537 to 543

Volume of gas (ft3) per lb of liquid at 60ƒ F and 30 in Hg

6,5 to 6,9

8,5 to 8,7

Boiling point at atmospheric pressure ƒC approx.

-2

-45

Vapour pressure for products at their maximum specified vapour pressure (gauge): Vapour pressure for products at their maximum specified vapour pre

Temp. ƒC

-40

-18

0

15

38

45

 

 

Bar

-

*

0,9

1,93

4,83

5,86

 

 

Bar

0,5

2,3

4,5

6,9

14,5

17,6

Latent heat of vaporisation (kJ/kg) at 15 ƒC

372,2

358,2

Latent heat of vaporisation (Btu/lb) at 60ƒ F

160

154

Specific heat of liquid at 15 ƒC (kJ/kg ƒC)

2,386

2,512

Sulphur content per cent weight

Negligible to 0,02

Negligible to 0,02

Limits of flammability (percentage by volume of gas in a gas-air mixture to form a combustible mixture)

Upper 9,0

Lower 1,8

Upper 10,0

Lower 2,2

Calorific Values:

Gross:

(MJ/m3) dry

(Btu/ft3) dry

(MJ/kg)

(Btu/lb)

Nett:

(MJ/m3) dry

(Btu/ft3) dry

(MJ/kg)

(Btu/lb)

 

 

121,8

3 270

49,3

21 200

 

112,9

3 030

45,8

19 700

 

 

93,1

2 500

50,0

21 500

 

86,1

2 310

46,3

19 900

Air required for combustion (m3 to burn 1 m3 of gas)

30

24