Table 254 (continued) 

 THERMAL CONDUCTIVITY OF INSULATING MATERIALS 



275 



No. 



Material 



Density 



g/cm 3 



t°C 



Conductivity 



joule/cm 2 /sec. 



g-cal./cmVsec. 



54 



55 

 56 

 57 

 58 

 59 

 60 

 61 

 62 

 63 

 64 

 65 

 66 



67 

 68 

 69 



70 



7i 

 72 



73 

 74 

 75 

 76 



77 

 78 

 79 

 80 

 81 

 82 

 83 

 84 

 85 

 86 



87 



90 

 9i 

 92 



93 

 94 

 95 

 96 



97 

 98 



99 

 100 

 101 

 102 

 103 

 104 

 105 

 106 

 107 

 108 



Micanite 



Mineral wool 



Paper, rice 



blotting 



Paraffin wax 



Peat, dry 



" blocks 



Porcelain 



Rubber, rigid sponge, hard 



sponge, vulcanized 



commercial, 40% rubber, 

 92% " 



Sawdust 



Shellac 



Silk . .. 



" scrap from spinning mill. . . . 



Snow 



Steel wool 



Wool, pure 



' very loose packing. . 

 Woods: Ash _L to grain 



Balsa _L to grain 



Boxwood 



Cedar X to grain 



Cypress _|_ to grain .... 



Fir X to grain 



" || to grain 



Lignum vitae 



Mahogany, _L to grain . 

 || to grain . 



Oak, J_ to grain 



|| to grain 



Pine, pitch, J_ to grain . 

 Virginia, ditto. . . . 



white, ditto 



|| to grain. 



Spruce, X to grain 



Teak, X to grain 



|| to grain 



Walnut, X to grain .... 



Rocks: Basalt 



Chalk 



Granite 



Limestone, very variable 



Slate, X to cleavage .... 



|| to cleavage .... 



Sandstone, air-dried .... 



freshly cut. . . 



•15 

 •30 



•19 

 .84 



.09 

 .22 



2.8 

 2.0 



2.2 

 2-3 



30 



30 



40 

 20 

 30 

 30 

 20 

 90 



25 

 20 



25 

 25 

 30 



■200 



■IOO 



O 



50 



o 

 55 

 55 

 30 

 30 

 20 

 20 

 30 

 20 



30 

 20 

 20 

 20 

 100 

 20 

 20 

 15 

 15 

 30 

 30 

 60 

 60 



15 

 15 

 20 

 20 



20 

 95 

 95 

 20 

 20 



.0021- 



.0042 



.00042 



.00052 



.00046 



.00063 



.0023 



.00052 



.0017 



.0104 



.00037 



.00054 



.0028 



.0016 



.00060 



.0023 



.00040 



.00023 



.00037 



.000495 



.00056 



.0016 



.00080 



.00090 



.00036 



.00042 



.0017 



.0031 



.00045 



.0015 



.0011 



.00096 



.0014 



•0035 



.0025 



.0030 



.0016 



.0031 



.0021 



.0036 



.0015 



.0014 



.0011 



.0026 



.0011 



•00175 



.0038 



.0014 



.020 



.0092 



.022 



.010 



.014 



.025 



.013 



.017 



.000050- 



.00010 



.00010 



.00012 



.00011 



.00015 



.00055 



.00012 



.00041 



.0025 



.000088 



.00013 



.00067 



.00038 



.000143 



.0006 



.00010 



.000055 



.000088 



.000118 



.000134 



.00038 



.000191 



.00022 



.000086 



.00010 



.00041 



.00074 



.000084 



.00036 



.00027 



.00023 



.00033 



.00081 



.00060 



.00072 



.00038 



.00074 



.00050 



.00086 



.00036 



.00033 



.00026 



.00062 



.00026 



.00042 



.00091 



•00033 



.0048 



.0022 



•0053 



.0024 



•0033 



.0060 



.00031 



.00041 



Running numbers arranged in order of increasing conductivity at room temperatures: .0002: 10, I, 16, 

 9. 32, 77. 7. 63, 69, 30, 55. 78. 81. 37. 3L 50, 72, 81; .0005: 46, 24, 56, 34. 60, 64, 13, 21, 67. 18, 33, 58; 

 .00075. 5, 52, 26, 51. 3, 76, 84; .001: 35. 83, 97. 85, 94. IOO, 14, 82, 93, 30, 50, 66. 74. 89, 61, 79, 6, 43, 

 98. 54. 91. 59, 68; .0025: 87, 65, 80, 90, 86, 44, 36, 92, 99. 54; -005: S3. 36, 37. IS. 12, 102; .010: 104, 45, 

 107, 108, 101, 47, 103. 



Smithsonian Tables 



