The arc resistance of binary filled silicone rubber

To research the influence of inorganic fillers on arc resistance of silicone rubber, alumina trihydrate (Al(OH)₃, ATH), boron nitride (BN) were chosen as fillers, unary filled and binary filled silicone rubber (SIR) specimens were prepared, the dispersion of organic fillers in SIR were characterized by scanning electron microscope (SEM), arc resistance of each specimen were investigated by high voltage low current arc test, and thermal degradation property was tested by thermogravimetric analysis. The results indicate that ATH unary filled SIR specimens show good performance during the arc test, but decompose seriously and loss much weight. Narrow conducting path forms rapidly when BN filled SIR specimens are exposed to arc discharge. The arc resistance property of ATH and BN binary filled SIR is improved as it takes the advantage of both ATH and BN.