Will AIS uPVC profiles turn yellow over a period of time?
AIS vinyl (PVC) is formulated using a superior durable grade of TiO2 that protects the vinyl (PVC) from the harmful effects of the Sun’s UV
rays. As long as your window is kept clean, with a periodic wash, it will not turn yellow. However there could be a variation in colour over a long period of time which is measured in ΔE.