Abstract
Abstract The weathering characteristics of grey and black PVC-covered conductors from several manufacturers were investigated after long-term exposure under both in-service and weather station conditions. Visual examination and physical testing revealed significant deterioration of light grey and dark grey conductor samples provided by one manufacturer. Accelerated weathering tests confirmed these results. Molecular weight distributions as determined by gel-permeation chromatography indicated that surface degradation by chain scission of the PVC resin had occurred in the deteriorated samples. The prime cause of this deterioration is believed to be the absence of suitable UV blocking properties, in these cases insufficient quantities of titanium dioxide.
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