AVERAGE VALUE OF THERMAL CONDUCTIVITY

Average value of thermal conductivity at normal pressure and temperature


Material

                                 Thermal

conductivity

         W/m-deg                 

Kcal/m-hr-deg

 

Metals

 

 

Aluminium

225

193

Brass

107

92

Copper

385

331

Cast iron

55-65

47-56

Steel

20-45

17-38

Silver

410

352

 

Construction Materials

 

 

Concrete

1.20

1.03

Brick (masonary)

0.65

0.56

Brick  (first clay)

0.78-1.75

05-1.5

Earth

0.138

0.119

Furnace of boiler slag

0.30

0.26

Glass (window)

0.75

0.65

Plaster

0.75-0.95

0.65

 

Insulating materials

 

 

Asbestos sheet

0.17

0.146

Cork, felt

0.05-0.10

0.043-0.086

Glass wool

0.03

0.032

Saw dust

0.07

0.06

Wood (Balsa)

0.052

0.045

 

Miscellaneous

 

 

Air

0.024

0.021

Ash

0.12

0.103

Ice

2.25

1.935

water

0.55-0.7

0.047-0.6

Freon

0.0083

0.0096

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