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How to choose quality upvc?

Time : 2022-03-21 Hits : 3

Knowing how to choose quality construction is vital to buying premium quality uPVC for your windows that will last for years.

Quality uPVC materials can be observed with these tips on uPVC windows & doors.

uPVC windows are very popular. Their clean lines, no maintenance characteristics, and energy efficiency make them a natural for both new homes and older homes that need a facelift.

However, not all uPVC windows are created equally. In fact, there can be vast differences in quality between windows that look identical.

The raw materials of upvc windows

Wood and aluminum windows have an advantage over PVC windows in one respect. Wood and aluminum are stiffer and they don’t bend quite as easily as uPVC. This is just one reason why it is important to really do your homework when deciding which uPVC window or door to purchase.

Many homeowners who installed the first generation of uPVC windows were disappointed. Large windows or windows that faced direct, hot afternoon sunlight sometimes were the victims of sag. The PVC would sag under the weight of large, heavy pieces of glass and/or would sag because the uPVC softened because of heat. The results were not pretty, as the uPVC would sometimes retain this new shape after the uPVC had cooled.


Other homeowners became disenchanted with uPVC windows because they would mysteriously change color after several years. Poor quality uPVC windows had a tendency to turn yellow. This color change was a result of poor quality ingredients in the uPVC Material Compound.

What makes good uPVC?

uPVC windows and doors are made using polyvinyl chloride (PVC). This is the same plastic that is used in plumbing pipes, electrical pipes and many other household items. uPVC is made by combining several chemicals, fillers, plasticizers and pigments. As you might imagine, each of these ingredients is available in different levels of quality.

Those manufacturers who choose to make a quality product almost always purchase the highest quality ingredients. These, of course, are more costly. This, in turn, makes the cost of the materials higher than those being used by a competitor who wants to offer you a low price.

Color Change

Let’s take color change for an example. The ingredients which make uPVC stay pure white for many years are basically two ingredients: titanium dioxide (TiO2) and an organic form of tin. TiO2 is a pure white chemical used to tint the vinyl white. It is also used heavily by the paint industry to make pure white paints.

Anyway, these two ingredients are costly and they need to be used in certain minimum quantities to produce a high quality vinyl. Also, the grade of TiO2 must be a non-chalking grade, so that your windows don’t begin to dust after so many years.

uPVC Window manufacturers who do not use sufficient amounts or high quality forms of these two ingredients often must tint their windows a light blue color to buy time before they begin to yellow.

If you see uPVC windows that are a polar blue shade of white, BEWARE! If in doubt,ask for a sample of the vinyl material and take it to another showroom. Hold it against the windows in the highest priced showroom in your town. Compare the colors of different samples. When seen by itself, a polar blue uPVC doesn’t really look blue. But, when held against pure white samples, the blue coloration is dramatic.

It is important to note that some certified manufacturers do manufacture a high quality vinyl which does have the blue shading. They have chosen to do this on their own accord, as some of them think the blue coloration is attractive.

The Chambers

When you visit a window store, be sure to ask to see a cross section of the uPVC window frame material. Ask for a sample that you can take with you. You will notice that the frame is constructed of various sized chambers. Not only will the chambers be different sizes, there will be different numbers of chambers depending upon the quality of the manufacturer. The highest quality windows usually have the highest number of chambers.

The number of the chambers is important. The strength of the window and frame are a function of where the walls of each chamber connect to the walls of the other chambers. Yes, this sounds confusing, but it is important.

We already discussed that heat can make the uPVC soft. This softening can lead to deformation. The high quality uPVC windows have frames and sashes (that part of the window which frames the glass) that have been engineered to withstand the heat that causes the deformation.

During research and design testing, the stress points on a window frame or sash are identified. The good manufacturers then design the sashes and frames to have extra chambers to hold in shape those chambers exposed to the sun. These chambers are generally shaded and remain cooler.

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