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| :: The
Quiet Corner |
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The Lord's Prayer contains 56 words, the Ten Commandments 297, the
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sometimes when you least expect it"
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Doors:
Yellowing panels
Door Panels Discolouring
When people ask, ‘Does PVC-U fade?’, it is likely that they have seen a rogue door panel that has gone off colour, like this one. Either that or they have heard 'stories'.
| Yuk! But it actually looked an awful lot worse than this in the ‘flesh’! |
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First:
In the early days door panels were made out of fibreglass (GRP = glass reinforced plastic). It was a simple and natty idea: instead of fitting double-glazed sealed unit(s), make a feature panel and fit that instead, so that a PVC-U door looked more like a traditional wooden door. Great idea, but not long after their introduction, and to the horror of the industry, they started to lose their colour and yellowed. They could not be made to be UV stable and were quickly discontinued, but not before a lot of people saw them and thought that it was the PVC-U that was going
off-colour.
Next:
Next to come were thin sheets of PVC-U vacuum-formed to give the same effect. An indoor sheet and an outdoor sheet are formed to shape and then glued to an insulating foam core, job done. The problem was that most of the early ones held their colour only about twice as long as the early fibreglass ones, because the heating process necessary to create the vacuum had ruined the UV stability. Following much testing and research it was concluded that the problem came mainly from heating only one side of the PVC-U sheet and heating it too quickly.
Now:
Now that this is all old hat and well known in our industry and we have up-to date recognised methods of manufacture and machinery, we very rarely hear of new door panels
discolouring.
Read up more
about PVC-U going off-colour
If you fancy just getting out the paintbrush, see:
PVC-U colours and finishes and repainting
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