20-30 pages, which must contains technical details regarding the most producers of the elements of glass frames ( REHAU, VEKA, KOMERLING, GEALAN, etc)
The information from the materials, must be utils for taking a decision for choice a type of (frame and glass panel) or another type of window. So, it's necessary to provide inside the materials, the data about technical and economical info.
Some additional information, about what kind of product which we want to analize in materials, you can see on [url removed, login to view]; [url removed, login to view]; [url removed, login to view], etc.
(If is posible in Romanian language)