Polyurethane

Polyurethane (PUR, PU) is a polymer. It can be produced with very different properties, e.g. hard and brittle, soft and elastic, quick reacting, strongly foaming, and in various forms. For injections in the field of construction, the two-component (main component + hardener component) polyurethane foams (SPUR) and polyurethane resins (PUR) make the most important group. The reagent for the quick reacting polyurethanes is normal water. Depending on the recipe, the air humidity or the residual moisture in the concrete are enough to cause the immediate reaction. Polyurethanes are used e.g. for the repair or sealing of constructions and for flexible coatings.