Window from polyvinylchloride (PVC)
The PVC windows is the hardly flammable and self-extinguished material. It is steady against influence of alkalis, acids, lime, and also against atmospheric actions.
Polyvinylchloride (PVC) is the material relating to group of thermolayers (Termoplasta are plastic which after formation of a product keep ability to repeated processing). Pure PVC for 43% consists of ethylene (petrochemical product) and for 57% from the connected chlorine received from table salt. PVC is emitted in the form of powder. For production of window profiles, add stabilizers, modifiers, pigments and auxiliary additives to powdery PVC. These components exert impact on such properties of window profiles as light resistance, stability against atmospheric actions, a color shade, quality of a surface, a svarivayemost, etc.
As stabilizers lead which is in PVC in the connected, i.e. biologically passive state is mainly used. Recently a number of firms began to apply even more harmless compound of calcium and zinc.
For increase of impact strength (impact strength is an ability of material to absorb mechanical energy in the course of deformation and destruction under the influence of shock loading) add modifiers which increase durability of window details at their processing to the polymeric materials going for production of system profiles. Therefore sometimes the PVC which is used for production of window profiles call modified.