INTERESTING HISTORY FACTS ABOUT POLYURETHANE
The first commercial applications for polyurethane starts in the middle of the 20th century. Since then, they have been finding use in an ever-increasing number of applications in different industries. For example, construction, refrigeration, automotive, furniture, and footwear. Polyurethane is incredibly versatile.
ADVANTAGES OF PIR AND PUR INSULATION PRODUCTS
Rigid polyurethane (PUR) and polyisocyanurate (PIR) insulation products are highly effective, lightweight, and many can bond to most materials. They have extremely low thermal conductivity and high strength to weight ratio. In combination with excellent manufacturing versatility, it provides a wide range of products. As a result, PIR/PUR insulation products are the natural choice for most construction insulation applications.
PRODUCTION OF PIR AND PUR INSULATION
Thanks to the reaction of a liquid polyol component with a liquid polymeric isocyanate, we receive Rigid PUR insulation products. Methylene Diphenyl di-Isocyanate (MDI), element in the presence of a blowing agent and other additives. The mixed components then react exothermally to form a rigid thermosetting polymer. Since the blowing agent evaporates during this exothermic reaction, we will receive a rigid closed cell low-density insulation product as a result. Excellent insulation achieves because the gas trapped within the closed cell structure has a very low thermal conductivity. And there is minimal heat conduction through the solid cell walls due to the low density. Approximately 97% of the volume of the foam is trapped gas.
The production process of Rigid PIR uses an excess of the MDI component. It differs Rigid PIR from PUR. In the presence of an appropriate catalyst, the excess MDI reacts with itself to form isocyanurate, which means more excellent heat stability. The resultant PIR insulation products have excellent fire performance, reduced combustibility, and higher working temperature limits compared to PUR. When incorporated into building products, they can meet some of the most demanding fire performance requirements such as those currently stipulated for some applications by the insurance industry.