UPVC windows are one of the most popular options for energy-efficiency. UPVC stands for Unplasticized Polyvinyl Chloride. It’s a low-maintenance material used as a replacement for painted wood, mainly in window frames. UPVC is strong yet lightweight, and it’s durable in that it’s not affected by changes in temperature. For this reason, it’s fantastic to preserve window frames.At Milano, however, we go one step beyond. Our window frames are not UPVC, but they are also 100% lead-free. This way, you get the benefits of UPVC without the toxicity of lead commonly found in window frames.