Optimized Processing of High Viscosity Liquid Silicone Rubbers for Large Electrical Components
Components used for MV and HV applications are exposed to high electrical loads and their insulation materials must be free of defects such as voids or air bubbles. However, liquid silicone rubbers are sometimes processed without vacuum pre-treatment to de-gas the basic components. This presentation describes the benefits of vacuum treatment with special attention to parts having large volume as well as on the machinery required. The focus will be on casting or injection of insulation components featuring a high shot weight of silicone material, e.g. cable joints or hollow core insulators where shot weights of LSR vary from 20 to 70 kg.