How are uPVC windows manufactured?

Having been around since the 1980s, uPVC windows are now a common sight in homes across the UK. We are used to seeing them, but we seldom give any thought to how they are manufactured. What goes into a uPVC window?

Image Credit

The basic component of uPVC frames is a profile section that is made by molten PVC being forced through a die. Once the profile is formed, it is cut to length and the pieces are used to make the shape of the window. The sections of the frame are joined together using either T-joints or a heat welding process. To deliver extra strength for large windows, bays and so on, a steel or aluminium section is fitted inside the UPVC. There are around 1,500 companies in the UK making uPVC frames.

Image Credit

Plastic fantastic

That explains the assembly of the frames, but what about the uPVC material itself? This is based on polyvinyl chloride; however, to make it suitable for windows, it has a number of other things added. These include stabilisers to ensure the material can withstand heat, cold and the effects of sunlight.

The material can also be coloured to suit the particular application, making it suitable for use in windows on a wide range of properties. It can, of course, also be used to make uPVC fascia and soffits, which are available from companies such as

Repair and maintenance

uPVC is designed to last for a long time, so it is important that any problems can be fixed easily. Keeping your frames clean and ensuring that moving parts are lubricated from time to time can help to ensure your windows have a long life.

The way uPVC windows are designed means that accessories such as locks and hinges are easy to access. This means they can be replaced without too much difficulty should the need arise. They are usually standard sizes, so getting replacement parts is no problem.

If the frame itself is damaged, it is often possible to repair chips and scratches using wax to fill the holes and smooth the surface. Kits are available to do this and come in assorted colours to match the original finish. Larger areas of damage can be repaired using resin and finished with a lacquer spray, although this is a more specialist job.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.