Conducting Hard Rubber and its Use as Composition Resistor
Swayam Bikash Mishra · IETE Journal of Research · 1960
Study of the conducting characteristics of carbon black compounded hard rubber using various types of carbon blacks has been made. This study has been done on cured samples of 38 mm. long and 7 mm. diameter. The effect of percentage of carbon black content, temperature of curing, period of curing and ageing of mixture on the conductivity has been investigated. These investigations reveal that all carbon blacks do not give stable conducting properties. It has been possible to get stable conducting characteristics up to specific resistance 10 MΩ-cm. and stable resistors of 38 mm. long and 7 mm. diameter up to 100 MΩ have been made. These resistere have been found to have low voltage coefficient and low temperature coefficient.Details of a noise measuring equipment built is given. Noise measurement has shown that the noise characteristics of these resistors are better than similar market resistors specially for values below 1 MΩ.