How to choose plastic windows

Today in the production of windows is offered a huge amount views of the window profile. And naturally, it depends a lot from the quality of this plastic - it can be for example unstable to the frost, brittle, bad

transferring temperature differences, lose color in the sun, etc. It also has a considerable value of the external profile walls (for Russia at least 3 mm) and their homogeneity, the number of aircases, etc.
So, what is important when choosing a plastic window?
Any plastic window reinforced (reinforced) metal inside (therefore windows and have the name of metal plastic). It should be noted that the weight of the opening window sash windows with a two-chamber double-glazed window (in three glasses) can have a weight of more than 50 kg. Naturally, this weight will not hold any plastic. In general, fasten the frame in the window opening and the windows sash hold the loop, and all this construction does not respond and not fall off only due to the metal inside the design.
The design and aesthetics of the profile is good, but everyone wants to buy plastic windows at low prices so that they are not only beautiful in appearance, but reliable! So, that all this is humanly was, the window of a square closed section should be used as a reinforcement (amplifier) \u200b\u200bof the window. These are four ribs of strength and rigidity.
Such a geometric design plus special steel makes it possible to achieve excellent static indicators and avoid the "savings" of the sash. Nevertheless, windows manufacturers are very often saving, the reinforcing frame profile of the pipe window "P" is a shape. In fact, it is only two ribs. If at the same time save on the thickness of the wall capacity and the metal itself, the result will be a deplorable ...
I also want to notice that some types of PVC windows are made so that it is physically not provided for the possibility of complete reinforcement with a square pipe. But, as they say, in the snow in the winter it is possible to walk in the dies, and the defective, the hip window does not open at all. So when choosing plastic windowsbe careful that the PVC windows become reliable and comfortable protecting your home from drafts, and a beautiful but unreliable framed.