PVC products - facts and myths
Main construction element of windows are high-impact PVC, which is divided inside with vertical walls. This way of manufacturing provides the basis for classification of profiles into three, four, five, six, seven or even eight-chamber. From the number and width of the chambers and the profile width depends thermal transmittance coefficient U. In the most common, five-chamber profile with a typical width of 70 mm Uf is 1.3-1.5W/(m2*K). With the growth of chambers quantity and width of the profile the U ratio is lower ( less heat escapes through the surface of the window.
Windows can have facing profiles - it means that the surfaces of the sash and the outer frame are in the same plane. Outer frame to sash contact can be sealed with two or three gaskets. Window gaskets are made from slow-aging materials, such as silicone, ethylene-propylene rubber (EPDM), silicone rubber and TPE - thermoplastic elastomer. They are pressed into the slots in the profile (at the edge can be welded to it). If necessary, gaskets are easy to replace.
PVC used to produce windows is chemically enriched. Due use of the stabilizers, PVC profiles are protected against aging and loss of color. PVC windows are not harmful to health as well as plastic cups, spoons, sets of blood storage and many other plastic products. PVC profiles are evaluated by the PZH (National Institute of Hygiene).
Small and medium sized companies which produce PVC windows and doors often offers a higher quality product than the industry giants because of the lower cost of production and attention to customer satisfaction.
