CURTIS: PROPERTIES OF SOLID DIELECTRICS 493 



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TABLE 1 



Volume Resistivity of Solid Dielectrics 

 {Materials arranged in order of decreasing resistivity) 



Material 



Special Paraffin over 



Ceresin over 



Fused Quartz over 



Hard Rubber 



Clear Mica 



♦Sulphur 



*Ainberite 



*Rosin 



*Mica (India ruby slighth- 

 stained) 



G. E. No. 55R 



HallowaxNo. 5055 B 



Mica (Brown African 

 clear) 



Bakelite. L55S 



♦Elect rose No. 8 



*Parowax (paraffin) 



Glyptol 



♦Shellac 



Kavalier Glass 



♦Insulate No 2 



♦Sealing Wax 



♦Yellow Electrose 



♦Duranoid. 



♦Murdock No. 100 



♦Yellow Beeswax 



Khotinsky Cement 



♦G. E. No. 40 



♦G. E. No. o5A 



^Moulded Mica 



Resistivity 

 olims-cm. 



5000 X lO''^ 



5000 X 1015 



5000 X 1015 



1000 X 1015 



200 X 1015 



100 X 1015 



50 X 1015 



50 X 1015 



50 X 1015 



40 X 1015 



20 X 1015 



20 X 1015 



20 X 1015 



20 X 1015 



10 X 1015 



10 X 1015 



10 X 1015 



8 X 1015 



8 X 1015 



8 X 1015 



5 X 1015 



3 X 1015 



3 X 1015 



2 X 1015 



2 X 1015 



1 X 1015 



1 X 1015 



1 X 1015 



Unglazed Porcelain 300 X lOi^ 



Redmonite (157,4) 200 X lOi^ 



Black Electrose 100 X lOi^ 



Tetrachlornaphthalene. . . 50 X 10'- 



Mica (India ruby stained) 50 X 10i== 



German Glass 50 X lO'^ 



Material 



Paraffined Mahogany .... 



Stabalite 



Plate Glass 



Hallowax No. 1001 



Dielectrite 



Bakelite No. 5199 RGRB. 



Bakelite No. 150 



Gummon 



Tegit 



Opal glass 



Resistivity 

 ohms-cm. 



40 X 1012 



30 X 1012 



20 X 10" 



20 X 1012 



5 X 1012 



5 X 1012 



4 X 1012 



3 X 1012 



2 X 1012 



1 X 1012 



Paraffined Poplar 500 



Bakelite No. G5200 RGR . . 400 



Paraffined Maple 300 



Bakelite No. 1 200 



Bakelite No. 190 100 



Italian Marble 100 



Bakelite Micarta 50 



Bakelite No. G 5074 40 



Black Condensite 40 



Yellow Condensite 40 



Vulcabeston 20 



White Celluloid 20 



Hard fiber 20 



Black Galalith 20 



Lavite 20 



White Galalith 10 



Hemit 10 



Red Fiber 5 



Marble Pink Tenn 5 



Marble Blue Vermont 1 



X 10» 

 X 109 

 X 10' 

 X 10-' 

 X 10=' 

 X 10« 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 

 X 109 



Ivory 200 X 10^ 



Slate 100 X 106 



Bakelite Xo 140 20 X lO^ 



♦ Apparent resistivity taken after the voltage had been applied for fifteen 

 minutes. 



