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swa garden lights
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<blockquote data-quote="Phoenix" data-source="post: 494339" data-attributes="member: 8133"><p>That applies to cables but not conduit (although black conduit will be bleached by the UV rays and go a greyish colour on the top half).</p><p></p><p>The breakdown of PVC occurs due to the effect on the plastisicer and turns it brittle (the sheath on twin and earth goes almost white and starts to crack outside), things like window frames and trunking are made from Upvc, with the U being unplasticised, i.e. it is a ridgid plastic and is not flexable like a cable, and while there might be a bit of embrittlement over the years, it doesn't suffer the same fate as oridnary PVC.</p><p></p><p>Some PVC can have UV stablisiing compounds added to the mix, which you get for thinks like the PVC oversheath on SWA, I learned once that tye wrapps are availble with and without it, but no one really worries about that too much, unless they break after twenty years and the SWA to a ticket office falls off the tray above the raileay, hangs down, and then is caught by the train and is pulled out the glands and whips back, causing damage/injuries</p></blockquote><p></p>
[QUOTE="Phoenix, post: 494339, member: 8133"] That applies to cables but not conduit (although black conduit will be bleached by the UV rays and go a greyish colour on the top half). The breakdown of PVC occurs due to the effect on the plastisicer and turns it brittle (the sheath on twin and earth goes almost white and starts to crack outside), things like window frames and trunking are made from Upvc, with the U being unplasticised, i.e. it is a ridgid plastic and is not flexable like a cable, and while there might be a bit of embrittlement over the years, it doesn't suffer the same fate as oridnary PVC. Some PVC can have UV stablisiing compounds added to the mix, which you get for thinks like the PVC oversheath on SWA, I learned once that tye wrapps are availble with and without it, but no one really worries about that too much, unless they break after twenty years and the SWA to a ticket office falls off the tray above the raileay, hangs down, and then is caught by the train and is pulled out the glands and whips back, causing damage/injuries [/QUOTE]
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