ON THE CONDUCTIVITY OF CARBON COMPOUNDED RUBBER AND A NEW METHOD OF GRADING RUBBER COMPOSITIONS

Abstract

It is well known that since the discovery of carbon blacks as active and essential fillers of rubber compositions the electrical conductivity of rubber can be varied in a great range from a highly insulating material to a good conductor. There are some results already published about the conductivity of rubber compounds with various carbon blacks (see literature references at the end of the article). The curves given are however vague and the range of conductivity from 10 Megohm to 1 million Megohm has not been studied in detail so that it seemed to be worthwhile to investigate these rubber compounds and the mechanism of the carbon rubber conductivity more thoroughly.