When it comes to durability, mineral paints by KEIM are unrivalled. An exterior coating should last at least 20 years – in terms of both appearance and functionality. That’s no great challenge for mineral paints by KEIM: they can easily last twice as long. Some exterior coatings with KEIM paints are 100 years old!
Exterior paints essentially have two tasks – to provide a colourful building, and to protect it from outside influences such as rain, UV radiation, heat, cold, harmful substances or micro-organisms. It is therefore no great surprise that some paint coatings cannot withstand these constant stresses for long, which then means: repainting. Or you can choose durable materials from the outset – silicate paints by KEIM.
When you build or renovate a house, you think in the long term and calculate in decades. This also includes the exterior walls of a house, with their important role as a weather shell with an aesthetic appeal when it comes to value preservation. Exterior paint is important because it protects against the effects of weather and damage due to moisture. This only applies if it remains permanently intact. Exterior surfaces are anything but a superficial topic – it is worth taking a closer look and choosing the right materials.
Mineral paints have proven themselves to be the benchmark for generations. There are good reasons why these paints have such a long life span:
The potassium silicate binder is extremely weatherproof because it bonds chemically with the substrate. The result is an extremely resistant, UV-stable bond without microscopic cracks and flaking paint. The mineral, permanently integrated pigments preserve the colour shades in the long term, and the surface does not become chalky.
KEIM paints also age with time – but they do so “gracefully”. Over the decades, they acquire a naturally beautiful patina.
Facade soiling depends on static charging, binder "stickiness" and surface condensation. Conventional emulsion paints are plastic-based and actually attract dirt. Warm temperatures make the organic binder sticky and dirt particles become embedded. The so-called "lotus phenomenon” of facades is frequently discussed. But in the end, the tendency of silicone resin paints for example to let water "pearl off" has proven to be more of a drawback in practice. Many facades with such "hydrophobic" (water-repellent) coatings are seen to be heavily soiled. Although the drops of water containing dirt particles pearl off to start with, in the end they become trapped by grains of render and settle on the surface.
1. Keim paints offer no suitable surfaces for dirt to settle. The potassium silicate binder is antistatic and is non-thermoplastic, which means it does not become sticky in warm temperatures.
2. Silicate-coated facades are open to diffusion, in other words, vapour permeable. Although they absorb water, they dry out again very quickly and in doing so, they release far more water than they absorbed. There is therefore far less chance for dirt particles to settle. As a result, the risk of algae infestation is far smaller. In addition, the enormous vapour permeability prevents annoying moisture congestion and possible frost damage behind coatings that are too thick. In other words: KEIM paints are ideal when it comes to building physics.
KEIM paints are also absolutely safe. They are non-flammable. This ensures maximum safety in the event of a fire, and no toxic gas release. Fire tests in Germany and the United Kingdom confirm this. Just one reason why silicate paints are used in public areas such as underground stations, tunnels, schools or cinemas. Health and safety first! And a coat of KEIM silicate paint pays off in more than one respect due to its long durability, optimum building physics and colour stability.
Impressive proof abounds: today there are still many original KEIM facades in great condition which originally date back to the end of the 19th century. Plenty of reasons why builders of prestigious buildings worldwide place their trust in KEIM products.