The "u" in uPVC stands for unplasticised. While standard PVC (Polyvinyl Chloride) contains plasticisers (phthalates) to make it flexible and soft—like the material used for cables or garden hoses—uPVC contains no such additives. This results in a rigid, durable, and chemically stable material ideal for structural applications.

Yes, uPVC is considered highly sustainable within the polymer family. It is 100% recyclable and can be re-processed up to ten times without losing its structural integrity. Furthermore, its long service life (often exceeding 50 years) and excellent thermal insulation properties significantly reduce the carbon footprint of buildings.

High-quality uPVC is formulated with Titanium Dioxide (TiO₂), which acts as a UV stabiliser. This prevents the material from degrading or yellowing when exposed to intense sunlight.
Modern British Standard compliant uPVC is designed to maintain its colour and finish for decades.

uPVC performs exceptionally well in moderate climates. It has a low thermal conductivity, meaning it does not transfer heat easily.
However, it can become brittle at temperatures approaching 0°C and may begin to soften if exposed to constant temperatures above 60°C. For high-heat industrial applications, CPVC (Chlorinated PVC) is often used instead.

uPVC is inherently self-extinguishing. It has a high ignition temperature and a low flame spread. Because of its chlorine content, it will not support combustion once the external flame source is removed.
It typically carries a Class 1 fire rating (BS 476) or a V-0 rating under UL 94.

Generally, no. Standard uPVC is rated for cold water or ambient temperature fluids. Continuous exposure to water above 60°C can cause the pipes to lose their pressure rating and eventually deform. For domestic hot water, materials like CPVC, copper, or PEX (Cross-linked Polyethylene) are preferred.

Maintenance is minimal. Surfaces should be cleaned with warm soapy water and a soft cloth. You should avoid abrasive cleaners, scouring pads, or solvent-based cleaners (like thinners or acetone) as these can scratch the surface or eat into the polymer, leading to permanent damage.

uPVC is chemically inert and safe for the transport of potable (drinking) water. Because it does not contain BPA or phthalates, it does not leach harmful chemicals into the water supply. It is also resistant to bacterial growth due to its exceptionally smooth internal surface.

While uPVC does not require painting, it can be painted using specialised uPVC-bond paints or coatings. Standard household paints will not adhere properly and will likely peel. It is often more cost-effective to purchase "foil-wrapped" or "colour-through" uPVC if a specific aesthetic is required.

uPVC offers the best balance of thermal efficiency, cost, and maintenance.
Unlike timber, it does not rot, warp, or require regular painting. Unlike aluminium, it is a natural insulator and does not require a thermal break to prevent condensation and heat loss, making it a superior choice for energy-efficient glazing.