Expanded rigid polyurethane panel
One of the most important types of polyurethane is the expanded rigid one.
These materials, thanks to their excellent thermal insulation performances, contribute to improve energy efficiency of buildings and of all those products and systems which require a careful management of heat exchanges.
Expanded rigid polyurethanes (PUR) are polymers derived from an exothermic chemical reaction, complete and irreversible, of two main liquid components (isocyanates and polyols) woth blowing agents and other additives.
Polymerization leads to the creation of a macromolecule with a urethane structure (PUR = polyurethane).
The process of creation of macromolecules releases a considerable amount of heat (exothermic reaction) which the blowing agent utilizes to pass from the liquid status to the steam one, thus causing the foam expansion.
This reaction results in the development of a polymer which permanently adhere to coatings, by facilitating the creation of sandwich panels for insulation.