PIR (Polyisocyanurate) has similar properties to PUR. Even though PIR is not non – combustible, it does not burn in the same way as other foams such as EPS and PUR. When subject to fire, PIR forms a carbonaceous layer which retards further flame spread and penetration.
Physical Properties of PIR (Polyisocyanurate)
PIR (Polyisocyanurate) has a standard density of 35 kg/cubic meter. Its thermal conductivity (K value) is 0.022 W/m.K @ 10 degrees Celsius. Its recommended operating temperature is within the range of -180 to 120 degrees Celsius. PIR (Polyisocyanurate) has its Compressive strength of 110 kPa and the water absorption is 5 wt%.