There is a common misconception that uPVC may warp or discolour over time. However, the truth is that uPVC is highly durable and is resistant to rot, corrosion, and fading, ensuring long-lasting performance and minimal maintenance. Many years ago (back in the 1970s and 1980s) there were some issues with uPVC yellowing over time, however, modern uPVC is extremely durable and does not warp or discolour. uPVC has been used for windows and door in UK and Germany since 1970’s and is the most common joinery used due to its exceptional insulation and durability.