Upvc is based on Polyvinyl chloride(pvc) one of the most versatile polymers found in the century;where U stands for unplasticized. It's one of the most preferred window framing material across the material. It is low on maintenance & offers high weather/UV resistance.It offers better insulation as compared to aluminum windows due to its non metallic property.It's 100%recyclable.Excellent cost benefit ratio & indoor air quality.