The polymer coating protects the metal lining of sandwich panels from corrosion, mechanical influences and ultraviolet radiation. It is this element that determines how long the panels will retain their original appearance and perform their protective functions. However, the service life of the coating depends not only on its type, but also on the operating conditions, the quality of installation and regular maintenance. In this article, we will look at how many years such materials can last and what factors affect their durability.
What determines the service life of the coating
The basis of most sandwich panels is galvanized steel with a protective and decorative polymer layer. The thickness of the zinc coating is usually 100-275 g/m2, and the thickness of the polymer layer is from 20 to 200 microns, depending on its type and purpose. This combination provides the metal with reliable protection from environmental influences. The following conditions help extend the service life of the coating:
• high-quality galvanized steel with uniform application of protective layers;
• the right type of polymer coating, taking into account the climatic conditions and the purpose of the facility;
• no damage to the protective layer during transportation and installation;
• regular cleaning of the surface from contaminants that retain moisture and aggressive substances;
• timely removal of deep scratches and other mechanical damages.
When these conditions are met, polyester-coated panels usually retain their performance properties for 20-30 years. More resistant coatings based on PVDF or polyurethane can effectively protect metal for 30-40 years, and even longer under favorable conditions.
Why does fading and corrosion occur?
Gradual color change under the influence of sunlight is considered a natural process. High-quality polymer coatings fade slowly and evenly, so small changes in hue become noticeable only after many years of operation.
It is much more dangerous when the protective layer is damaged mechanically. Through deep scratches or chips, moisture gets access to the metal, which can lead to corrosion over time. Such processes develop especially rapidly in areas with high humidity, industrial emissions, or under constant exposure to salts and chemically active substances.
Even the most durable coating is not designed to disrupt the installation technology. Using unsuitable tools, damaging the surface with abrasive wheels, or untimely removal of metal shavings can significantly shorten the service life of the panels.
The polymer coating remains an effective protection only with a combination of high-quality materials, proper installation and proper operation. That is why, when choosing sandwich panels, it is worth paying attention not only to the thickness of the metal, but also to the characteristics of the protective layer. You will always find such products in the MaxProduct catalog. We produce wall and roof sandwich panels with reliable polymer coatings designed for long-term operation in various climatic conditions.