... -steel-structure.com, the glass sealant is installed on the window frame, and not only for lighting the windows open and ... airy, with good water-tightness and air tightnessSpeciation: * Window Glass Option: Clear,tinted,Low-E,tempered,insulated,reflective,frosted ... elegant appearance, anti-aging, high-quality steel doors and can live for more than 15 years. Also steel doors and windows ...