This thesis describes a study of electrical conduction in polyvinylchloride compounds. By way of an introduction the first chapter outlines mechanism of absorption and conduction in polymeric systems, reviews the principles of formulation of polyvinylchloride compiounds for use in electrical insulation applications, and gives a review of previous measurements on such compounds. In the second chapter a description of the experimental techniques employed in the present study is given. The experimental results are presented in the third chapter, and in the final chapter the results are discussed and conclusions drawn. The research described is the original work of the author and has not been submitted for any other degree. Additional information has been gathered from various literary sources which are listed at the end of the thesis.