What is the difference between polyurethane (PUR), polyisocyanurate (PIR) and certified polyisocyanurate (PIR)?
A. These materials all belong to the same generic family of thermosetting materials. PIR has a special polymer structure which gives improved fire performance compared to PUR. PIR has various levels of fire performance linked to the specific formulation used. Certified PIR uses a unique formulation that gives a highly fire resistant product which is capable of passing insurance industry tests. Companies such as LPCB and FM Global have precise details of approved formulations and regularly audit manufacturers facilities to confirm compliance.
