THE DIFFERENCE BETWEEN PIR AND PU
PUR and PIR are both types of rigid polyurethane foam, but there are significant differences in their chemical and physical properties.
Polyurethane rigid foam is mainly composed of polyols and isocyanates. Polyols are further divided into polyether polyols and polyester polyols.
Polyurethane rigid foam is mainly composed of polyols and isocyanates. Polyols are further divided into polyether polyols and polyester polyols.
The product produced by the reaction of polyether polyols and isocyanates is PUR, while polyester polyols and isocyanates undergo trimerization
to produce polyisocyanurate (PIR).
The production process of PUR and PIR is different, and the product performance may vary. PIR foam has more excellent and stable performance. Compared with PUR foam, PIR foam with the same density has much higher compressive strength than PUR.
PIR has better flame retardancy and low smoke properties than PUR. Therefore, it is mainly used for building insulation.
PIR has good heat resistance. It can be used for a long time in an environment of 150 ℃, with a size change rate of less than 1%. The temperature
The production process of PUR and PIR is different, and the product performance may vary. PIR foam has more excellent and stable performance. Compared with PUR foam, PIR foam with the same density has much higher compressive strength than PUR.
PIR has better flame retardancy and low smoke properties than PUR. Therefore, it is mainly used for building insulation.
PIR has good heat resistance. It can be used for a long time in an environment of 150 ℃, with a size change rate of less than 1%. The temperature
is higher for short-term use. If ordinary polyurethane rigid foam is used at this temperature for a long time, its strength will gradually decline, and its appearance and size will also change.
