Pella Impervia windows and doors are made from Duracast® - the strongest, most durable material available in windows and patio doors.*
- Duracast is nine times stronger than vinyl and twice as strong as aluminum.*
- Highly stable material is suitable for all climates.
- Won’t expand, warp or sag in summer heat.
- Won’t shrink or turn brittle in harsh winter conditions.
- Resists dents, scratches and damaging UV rays to stay looking like new year after year.
*In testing performed in accordance with ASTM testing standards, Pella’s Duracast has displayed superior performance in strength, ability to withstand extreme heat and cold, and resistance to dents and scratches.