274 Table 254 



THERMAL CONDUCTIVITY OF INSULATING MATERIALS 



(Compiled from the International Critical Tables, which see for more complete data.) 



Material 



Density 

 g/cm 3 



t°C 



Conductivity 



joule/cmVsec. 



-cal./cm ! /sec. 



9 

 io 

 ii 



12 



13 

 14 

 15 

 16 



17 

 18 



19 



20 

 21 

 22 

 23 



24 



25 

 26 



27 

 28 



29 



30 

 31 

 32 



33 

 34 

 35 

 36 

 37 

 38 

 39 

 40 



4i 

 42 

 43 

 44 

 45 

 46 



47 

 48 



49 

 50 

 5i 

 52 

 53 



Air, 76 cm Hg 



Asbestos wool 



" with 85 per cent MgO. 

 Brick, very porous, dry 



" machine made, dry 



" moist 



1.2% vol 



Calorox, fluffy mineral matter . . 



Celluloid, white 



Cement mortar 



Chalk 



Charcoal 



Coke dust 



Concrete 



Cork 



Cotton, tightly packed 



Cotton wool, tightly packed. . . . 

 Diatomite, (binders may increase 



.100%).... 



Diatomite, ditto 



Ebonite 



Felt, flax fibers 



" hair 



' ' wool 



Fuller's earth 



Glass, lead 



" soda 



wool 



Graphite, 100 mesh 



40 " 



20 to 40 mesh 



Horsehair, compressed 



Ice 



Leather, chamois 



cowhide 



" sole 



Linen 



Linoleum, cork 



Mica, average 



.00129 

 .40 

 .40 

 .40 

 •3 

 •7i 

 [-54 



.064 

 1.4 

 2.0 



.18 



1.0 



1.6 

 •05 

 •05 

 •35 

 •35 

 .08 

 .08 

 .08 

 .08 



.20 



.20 



•50 



•50 



1. 19 



1. 19 



1. 19 



.18 



.27 



•15 



•33 



•53 



2-59 

 2-59 

 .22 

 .22 

 .22 

 .22 



.42 

 .70 



•17 

 .92 



1.0 

 •54 



o 



— 100 



o 



+ 100 



30 



20 

 o 



50 

 30 

 30 

 90 



20 



20 











100 







100 



-I50 



o 



+150 

 30 



o 

 400 



o 

 400 



— 190 



- 78 



o 



30 

 30 

 40 

 30 

 30 

 15 



20 



100 



50 



IOO 



200 



300 



40 



40 



40 



20 



o 



85 

 85 

 30 



20 

 20 

 50 



.OOO23 

 .OOO68 

 .OOO9O 

 .OOIOI 

 .OOO75 

 .OOI74 

 .OOO38 



.OOO96 



.OOO32 



.00021 



•OO55 



.OO92 



.OOO55 



.OOI5 



.008 



.OOO32 



.OOO4I 



.00061 



.OOO79 



.OOO38 



.OOO56 



.OOO76 



.OOO42 



.OOO52 



.OOO94 



.00086 



•OOI57 



.OOI38 



.OOI57 



.OOl6o 



.OOO47 



.OOO36 



.OOO63 



.OOO52 



.OOIOI 



.0060 



.OO72 



.OO76 



.OOO42 



.OOO5O 



.OOO65 



.OOO81 



.0018 



.OO38 



.0129 



.00051 



.022 



.OOO63 



.OOI76 



.0016 



.OOO86 



.OOOSO 



.0050 



.OOOO55 



.OOOI62 



.000215 



.OOO24 



.OOOI79 



.OOO42 



.OOOO9 l 



.OOO23 



.OOOO76 



.OOOO5O 



.OOI3 



.0022 



.OOOI3 



.OOO36 



.002 



.OOOO76 



.OOOO98 



.OOOI46 



.OOOI89 



.OOOO91 



.OOOI33 



.OOOI8 



.OOOIO 



.OOOI2 

 .00022 

 .0002 1 

 .OOO37 

 .OOO33 

 .OOO38 

 .OOO38 

 .00011 



.000086 

 .000151 

 .000124 

 .00024 



.00143 



.00172 

 .00182 

 .000100 

 .000120 



.000155 

 .000195 

 .00044 

 .00093 



.0031 



.000122 



•0053 



.000151 



.00042 1 



.00038 



.00021 



.000191 



.0012 



Smithsonian Tables 



