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What the material is, and how it compares to timber, aluminium and PVC.
The word that matters is unplasticised. What that changes, what goes into the compound, and the five things to check when buying.
One is for windows, the other for hot water pipes. What chlorination actually changes, and why the two are not interchangeable.
Plasticisers are the whole story. What they do to rigidity, ageing and UV resistance — and what to compare once you know every window profile is unplasticised.
Timber wins on appearance and repairability. uPVC wins on everything that happens after year three. The honest version of both cases.
An untreated aluminium quote looks cheaper because it is a different product. What a thermal break costs, and where aluminium still wins.
Each material fails differently, and how it fails matters more than how it performs when new. A four-way comparison on whole-life criteria.
A straight assessment rather than a list of benefits — including the five cases where uPVC is the wrong choice.
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