polyuréthane

Polyurethane, often abbreviated as PU, is a versatile polymer composed of organic units joined by carbamate (urethane) links. It is formed by the reaction of a polyol with a diisocyanate or a polymeric isocyanate. The properties of polyurethane can be widely varied depending on the choice of starting materials, allowing for the creation of a vast range of products. These include flexible and rigid foams, durable elastomers, tough coatings and adhesives, and high-performance fibers.

Polyurethanes are known for their excellent abrasion resistance, tensile strength, and tear resistance. They can be formulated to be soft and flexible, like those found in cushioning and upholstery, or rigid and strong, used in construction materials and automotive parts. The chemical resistance of polyurethane also makes it suitable for protective coatings and sealants. In its elastomeric form, it can replace rubber in many applications due to its superior durability. The manufacturing process for polyurethane typically involves mixing precise amounts of polyol and isocyanate components, often with catalysts and other additives, which then undergo a chemical reaction. This process can be carried out in various ways, including molding, spraying, and casting, depending on the desired final product.