The silicate glass is an insulator having very few free carriers at room temperature. Until its breakdown it conducts very small current with very small conductivity. When the the critical electric field at breakdown the current begins to increases explosively. Because the breakdown occurs in very small area hot spot will be formed and consequently an S-curve breakdown will be formed. This is a characteristics behavior of breakdown of solid state insulators.
The silicate glass is an insulator having very few free carriers at room temperature. Until its breakdown it conducts very small current with very small conductivity. When the the critical electric field at breakdown the current begins to increases explosively. Because the breakdown occurs in very small area hot spot will be formed and consequently an S-curve breakdown will be formed. This is a characteristics behavior of breakdown of solid state insulators.