It's the most classic debate in every home preparing for renovation. The moment someone suggests uPVC windows for their excellent insulation and affordable price, there's always someone who says: "Don't install plastic in Greece! The sun will burn them - they'll turn yellow in five years and become brittle."
This fear is perfectly justified. The Mediterranean sun is relentless and UV radiation severely stresses construction materials. But if this rule still held true, how do we explain uPVC steadily gaining market share in Greece?
Let's look at what happened in the past, how the modern industry permanently solved the problem, and what exactly you need to check before buying to keep your windows pure white for decades.
To understand the myth, we need to go back to the 1990s. That's when the first mass imports of synthetic windows arrived in Greece, mainly from Northern or Eastern European countries.
The problem was that those profiles were designed for the German or Polish climate, where sunshine is limited. When placed in sunny Athens or on the Greek islands, intense UV radiation broke down the polymer chains. The result: windows lost their gloss, yellowed ("chalking") and became brittle.
Today, major branded uPVC manufacturers leave nothing to chance. To shield the material against UV radiation, they add a powerful ingredient to the plastic compound: Titanium Dioxide (TiO2).
Think of Titanium Dioxide as the window's sunscreen. Just as we apply high-SPF sunscreen to avoid sunburn at the beach, this ingredient reflects UV radiation, preventing it from penetrating and destroying the profile structure. The higher the TiO2 content, the more "invulnerable" the white colour is over time.
To be 100% sure your money is well spent, the salesman's word is not enough. You need to look for the correct European certification.
Under European standard EN 12608, uPVC profiles are divided into climate classes. Class M is intended for moderate climates (Northern and Central Europe). These profiles must not be installed in Greece.
Class S is designed for harsh, sunny climates with high temperatures (Mediterranean, Middle East). Class S profiles are tested in accelerated ageing chambers, bombarded with extreme UV doses for thousands of hours. In Greece, you must insist strictly on Class S profiles only.
White reflects heat. But what happens if you want modern dark colours (e.g. Anthracite) or wood-look finishes on a south-facing wall?
Here the risk isn't yellowing but thermal deformation. A dark plastic under the August sun can develop surface temperatures of 70-80°C.
Coloured PVC is clad with special acrylic films (foils) using "CoolColors" technology, which reflect infrared (thermal) radiation, dropping the profile temperature by 10-15 degrees.
Thicker, stronger galvanised steel is required inside the profile to contain thermal expansion and prevent the window from warping.
The "yellowing" myth firmly belongs to the past, as long as you make the right choice. Modern, branded synthetic windows designed for the Greek market are heavy-duty, reinforced with titanium filters and engineered to withstand the most extreme Mediterranean temperatures.
💡 Key Takeaway: Insist on Tropical Class (Class S) per EN 12608 with TiO2 in the formulation. For dark colours, ensure CoolColors film and reinforced steel are present.
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