... profile:1).Aluminum Alloy:1.0-2.0mm. 2).PVC/UPVC:2.0mm,2.5mm(thickness of reinforce steel:0.8mm ... top brand like GuoQing,LianXin,ChuGuang).11.Advantages of PVC/UPVC windows1)waterproof,fireproof,sound insulation,corrosion resistant2) Environmentally friendly, ... install, easy to maintain,easy to clean12.Advantages of Aluminum windows:1)top quality,durable and strong2) Elegant appearance .Varies color ...