Polyurethane is polymers consisting of a chain of organic units involving carbamate connections and is found by Otto Bayer and his colleagues in 1937. It is a material that looks like glass with a very low density, varnish, rubber or tyre looking like bubble. PIR (Polyisocyanurate) is the version of polyurethane system, the degree of incombustibility of which is developed for composite sandwich panels.

Polyurethane has a decent bubble structure, 90-95% of the cells in its structure is covered. This ensures heat insulation of polyurethanes to be perfect; in other words, makes it the best insulator known in the world.

Usage density can be produced between 30-40 kg/m3 and 1200 kg/m3.
Even though it has a covered cell structure, polyurethane also provides a good sound insulation.
Polyurethanes have good adherence characteristics. They adhere to almost all surfaces that are applied to.
Even though they are in B3 non-combustion class, they can be elevated to B2 and B1 and even to A class with some additives.
Polyurethanes have high dimensional determination. Between -30 and 80 0C, they neither present any expansion, nor do they draw apart from the surface they adhered.
As polyurethane exterior siding materials do not involve the chemicals the known plaster types involve, their exterior siding dye have very long life times, their colour remain brighter and they are more resistant to climate conditions.
They do not absorb water.
They do not let bacteria generation inside.