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Published online by Cambridge University Press: 01 February 2011
The processing of fire-resistant non-halogeneted electric cables is a specific challenge. Metal hydroxides have always been extensively used as fillers in the insulating polymer sheaths. Recently, an hydrated zinc borate has been said to act in synergy with the traditionnal aluminium trihydroxide. We report the results of a microstructural investigation of a cable containing zinc borate in combination with aluminium trihydroxide, submitted to different heat treatments in order to get information about the structural modifications and the degradation of the electrical properties. We conclude with a short proposal to improve its efficiency.