Process for producing electric insulator

摘要

An electrical insulator is produced by coating a molded part of the insulator with a hydrophobic plasma-polymer coating. The plasma-polymer coating is produced by igniting a plasma in a non-polar working gas or a working gas having non-polar groups at a working pressure of between 0.001 Pa (1.10-5 mbar) and 50 Pa (5.10-1 mbar). The electrical power input per chamber volume lies between 0.5 and 5 kW/m3, the gas flow per chamber volume lies between 10 and 1000 sccm/m3. A durable, hard and hydrophobic plasma-polymer coating is created, the quality of which is independent of the material of the molded part.