The condenser type (a.k.a. internal insulation) of ChinSun® bushings includes Impregnated Synthetics (RIS) and Resin Impregnated Paper (RIP). For both types, carbon-fiber paper is used as the capacitive grading layers with the supplementary semiconductive paper edge, which provides good conductivity and gets a less than <5pC partial discharge performance and a less than <0.004 dielectric loss factor.