PYROLYTIC FILM RESISTORS: CARBON AND BOROCARBON 



307 



Table II 



Table III 



1 For resistances of 0.4 ohms to 90,000 ohms 



2 For resistances of 90,000 ohms to . 25 megohms 



It is possible now to produce pyrolytic film type resistors with temperature 

 coefficients as small as -20 PPM deg C-^ roughly one tenth the minimum 

 value for pyrolytic carbon, and, indeed, lower than for many wire-wound 

 types. 



Boron is incorporated in the carbon by the simultaneous pyrolytic de- 

 position of carbon and boron from gaseous compounds of these elements. 



