Dielectric strengths for insulators CONDUCTOR AND INSULATOR TABLES

Dielectric strength in kilovolts per inch (kV/in):

Material*         Dielectric strength
=========================================  
Vacuum --------------------- 20          
Air ------------------------ 20 to 75    
Porcelain ------------------ 40 to 200   
Paraffin Wax --------------- 200 to 300  
Transformer Oil ------------ 400         
Bakelite ------------------- 300 to 550  
Rubber --------------------- 450 to 700  
Shellac -------------------- 900         
Paper ---------------------- 1250        
Teflon --------------------- 1500        
Glass ---------------------- 2000 to 3000
Mica ----------------------- 5000        

* = Materials listed are specially prepared for electrical use

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