Introduction to uPVC Windows uPVC windows, crafted from unplasticized polyvinyl chloride, have become a popular choice for homeowners and businesses due to their durability, energy efficiency, and aesthetic appeal. As the demand for sustainable and low-maintenance building materials grows, uPVC windows stand out as a leading option in the construction and renovation industries. Button Key Features of uPVC Windows One of the primary reasons for the popularity of uPVC windows is their impressive features. These windows are highly resistant to weathering, corrosion, and termites.