WEAKLY CONDUCTING NOZZLE FOR A GAS CIRCUIT BREAKER AND PTFE BASED MATERIAL THEREFORE

摘要

Provided is a nozzle for a gas circuit breaker and a material or a gas circuit breaker nozzle made of a composition comprising PTFE and at least one additive which leads to a weak dielectric conductivity of the PTFE-based material, wherein the composition comprises PTFE as a main substance, a first pigment-like additive giving the PTFE the necessary optical properties for a circuit breaker nozzle and a second additive giving the PTFE a controlled dielectric conductivity, wherein the amounts of the additives are selected in amounts, so that the material shows a core-shell like structure, wherein the core of the core-shell like structure is mainly formed by the PTFE and/or the PTFE with the first pigment like additive, and wherein the shell of the core-shell like structure is mainly formed by the second additive causing a dielectric conductivity of the sintered product in the range of 1*10 -14 S/m -8 S/m by forming the shell of the core-shell like structure.