Improved formulation for tracking resistance and long-term accelerated degradation of fiberglass reinforced plastics

This paper describes experiments which were conducted to determine the optimum composition of fiberglass reinforced plastic for tracking resistance. The evaluation of tracking resistance was conducted by the inclined plane method and a long-term accelerated voltage test under wet and contaminated conditions. Results show that the components having the greater effect on tracking resistance are glass fiber, aluminum trihydrate and thermoplastic polymer used as an anti-shrinking agent. Correlation between the inclined plane method and the long-term accelerated voltage test can be noted.