What is the steel profile?
Simply put the profile is installed into a window that can still be seen after the outer surface. Such as the large and small faces of the box. While the middle glass trough installed glass and pressed after the invisible, that is non-visible surface.
GB 8814-2004 according to the thickness of the main section of the profile will be divided into three categories of ABC, according to the "visible wall thickness minimum / non-visible wall thickness minimum" said, A type of wall thickness of 2.8 / 2.5mm, B Type of material requirements wall thickness 2.5 / 2.0mm, C type of wall thickness does not specify the requirements. The mainstream of the national standard profiles are Class B.
The profile is still visible when the window is still visible
