Aluminum extrusions PVC-u is much stronger, stronger, more stable and longevity than horns. The life of an aluminum window is shown as 40 years, while the PVC-u windows need to be changed in 25 years. 100% recyclable, natural and environmental. 95% energy saving is provided for recycling. That is, the energy used for recycling is only 5% of the energy consumed for primary production. 80 million tons of greenhouse gas emissions are saved from the recycling of aluminum scrap. Lead, mercury, etc. Toxic and carcinogenic substances.