Aluminium paints are lacquers and coating materials that in addition to a paint binder (mostly synthetic resin) contain aluminium powder. The powder consists of extremely fine flakes and is the substance responsible for the colour, the pigment, and the colour is thus silver-white or -grey. Once they have been applied, the flakes arrange themselves in the binder parallel to each other in a thin coating consisting of five to ten layers. As the flakes overlap each other and are only joined to each other by extremely fine layers of the binder, moisture and corrosive substances have to go a long way to penetrate to the base material - which means there is good resistance to weathering and corrosion. Moreover the high reflectance means that aluminium paints reflect 60 to 75 per cent of incident light and heat rays.
Depending on the binder, these properties result in paints (primary, intermediate and top coats) with special qualities for different purposes, above all for the protection of iron and steel, but also for timber and brickwork.
- Very good corrosion resistance coupled with high reflectance, also for ultraviolet radiation - for protective coatings on piping and tanks in the open.
- Decorative metallic appearance (metallic look) - for example, for painting road vehicles.
- Highly resistant to heat - for coatings on industrial furnaces.
- High reflectance of heat radiation - for the thermal insulation of roofs, goods wagons and storage tanks having temperature-sensitive contents (it remains noticeably cooler under aluminium paints than under coatings of other paints).