(1 )按照电压等级可分5kv,10kv,20kv,25kv,35kv (2)按颜色可分为:黑色胶垫，红色胶垫，绿色胶垫 (3)按厚度可分为:3mm,4mm, 5mm,6mm,8mm, 10mm,12mm.
