Electrical conduction properties of phenolic–melaminic laminates

With the purpose of understanding a well-documented RPC ageing phenomenon, consisting of a gradual increase of the plate resistivity for chambers working at high rate, we carried out a systematic study on the electrical conduction properties of phenolic–melaminic electrode plates. A number of small size sample plates were kept under intense electrical current at fixed voltage, to simulate a high-rate RPC working condition. In each test, typically lasting up to several months, the current evolution was monitored in different conditions of temperature and humidity. The experimental data represent an adequate base for studying the electrical conduction mechanisms of this type of material, in view of a full understanding of the RPC ageing.