LeHunt
Materials and Their Characteristics # 1985 York
The behaviour of UPVC pipes exposed to natural weathering for periods up to 51 months has been evaluated in terms of colour change, surface behaviour and low speed mechanical properties and the influence of CaCO,/Tj;0, substitution and gelation variations has been investigated within the programme.
As part of a continuing programme to evaluate the behaviour of UPVC products under natural exposure conditions encountered in Australia, the influence of varying gelation levels and formulation substitution of CaCO3 and TiO2 within standard specification constraints has been examined.
The specimens were exposed at 40° slope facing North and exposure conditions recorded both in calendar months elapsed and in terms of ultra violet radiation <385nm as measured for the exposure zone by Eppely pyranometer and expressed in terms of MF.Hr/m2.
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