ELECTRICAL INSULATION SYSTEM
1452337 Printed Circuits XEROX CORP 21 Dec 1973 59534/73 Heading H1R Substantially closed cell foam or microcellular material 14, inert to ozone, is mounted in close proximity to points of potential discharge such as at the ends of the connections I 1A, 12A of components 11 and 12 on the printed circuit board 10. The material 14 may be of neoprene, polyethylene, a polyvinyl chloride. Such material is said to be more efficient in suppressing corona discharge than the non-resilient and generally open-cell plastics material which has been previously suggested for reducing damage due to vibration, and also prevents egress of water vapour to the electrical connections.