Product Description Cheap Design Most Popular 2 Panel Security Grill Upvc Sliding Windows Manufacturing Product Series PVC / UPVC Sliding Windows Profile Type 1.Extruded PVC / UPVC Profile 2.Yes/No fill galvanized steel strengthening reinforcements (1.5mm-2.0mm thickness) into cavities of extruded PVC / UPVC profiles. Profile Color White,Silver,Grey,Brown,Wood Grain Color,Other Laminated Film Colors.Custom Colors Are Available. Profile Finish Yes/No Laminated Film Covered Glass Type Tempered,Insulated,Laminated,Low-e,Float,Reflective,Bullet-proof,etc Glass Color Clear (Transparent),Frosted,Grey,Blown,Green,Blue,etc Glass Layer Single Glass,Double or Triple Glasses (argon filled available) Accessory International qualified hardware of Germany,America,Australia,China Top Brands,etc Grille Grille is made of aluminum or UPVC profile,placed between the panes of the insulating glasses. Screen Fiberglass / Nylon / Stainless steel mesh & Rolling shutter outside are available Function Good Insulation,Watertight,Wind Resistance,Anti-ultraviolet,Anti-thief,Durable,Anti-aging,High Strength Function Data Thermal Insulation U-Value:2.0W/m2K;Sound Insulation:36db;Water Tightness:450pa;Wind Resistance:4500pa;Air Tightness: 0.4m³(m2h)