The first "real" windows were made on the basis of small sheets of glass. The production technology of this material was quite primitive — therefore, it was not possible to obtain a sufficiently large sheet with uniform thickness and transparency. For the glazing of a large opening, a standard solution was used: first, a metal or wooden binding was mounted, and small plates of glass were inserted into its cells.
Today, the practical need for such a complication of technology has disappeared. With modern equipment, it is possible to produce sheets of glass of a very large area — so there are no difficulties with glazing large openings. But sometimes, for design purposes, you need to simulate the design of a window with bindings. In order not to make the product more expensive, decorative bindings — sprats are used instead of full-fledged imposts.
Plastic profiles — sprats can be used to simulate a traditional window with internal bindings. Such elements are used to decorate almost any structures:
Previously, sprats were made from aluminum or alloys based on it. Today, metal products have been almost completely abandoned due to their high thermal conductivity. They were replaced by plastic sprats, which can be:
One of the important characteristics of sprats is their width. The narrower the details, the less noticeable they will be. The narrowest sprats imitate a decorative lattice on the windows, the widest ones allow you to create the impression of a traditional window with a binding.
Two types of elements are used when forming a layout of sprats — straight sprats and connectors. For the connection, both simple crosspieces can be used (then the connection turns out to be as inconspicuous as possible), and decorative sockets. Usually manufacturers of metal-plastic windows use sockets with different designs, which allows you to choose the style of window decor.

The decoration of double-glazed windows of modern plastic windows is made with the use of several types of sprats.
This is the most popular and most frequently used variety of sprats:
Installing a decorative layout inside a double—glazed window does not increase its thermal conductivity - light hollow plastic profiles practically do not conduct heat. Therefore, the decoration of the double-glazed window does not reduce the energy efficiency of the structure.
In contrast to the internal layout, external sprats (false bindings or false imposts) are placed outside the double-glazed window:
There are disadvantages to such a solution. Firstly, the installation of false imposts complicates the care of the double-glazed window — the external decorative layout accumulates dust. Secondly, when using low-quality glue, there is a risk of peeling the bindings from the glass.
In fact, these are not sprats, but just narrow imposts, which can be vertical or horizontal. They divide the frame into several parts, and at the same time several double-glazed windows are required for the glazing of such a structure.
Constructive sprats differ from conventional imposts only in thickness — therefore, such a solution is not used too often. The only advantage is an increase in strength due to the appearance of additional stiffeners. But at the same time they also increase:
Sprats — primarily internal or overhead — can significantly improve the appearance of the window. Their installation makes it possible to simulate the traditional design of a window sash or window grating, and to do this with minimal costs and without compromising the performance characteristics of the product.
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