SMART (PIR) Ducting System V/s PUR Ducting System
| DESCRIPTION | POLYISOCYANURATE (PIR) PANELS | POLYURETHANE (PU/ PUR) | REMARKS |
|---|---|---|---|
| Effect of Temperature | PIR will not become supple or melt away even at increased temperatures of above 200o F. | PU will start softening & dripping at temperature above 165o F and melts above 200o F. | More Service temperature of PIR Foam |
| Effect of Ultraviolet Light | No affect. | UV Light degrades PU. | - |
| Effect of Construction Material | PIR is not affected by solvents in adhesives, paint, strain, water repellent and preservatives. | PU can be affected with many solvents in adhesives, paint, strain, water repellent and preservatives. | - |
| Water Vapour Transmission | No | Water will penetrate and condense the cells thus reducing Insulation Value | - |
| Fire Propagation Properties | BS 476, Part 6, Class 0, with better fire retardant properties. | BS 476, Part 6, Class 0 | - |
| Insulation Property | Higher | Lower | Higher is Better |
| Density | More than 45 Kg/m3 | More than 28 Kg/m3 | Higher is Better |
| Thermal Conductivity | 0.019 W/m.K | 0.024 W/m.K | Lower is Better |
| Water Absorption | 0.03% | 2.23% | Lower is Better |
| Apparent Closed Cell | More than 95% | More than 95% | Higher is Better |
| Thermal Performance | More R Value per inch | Less R Value per inch | More is Better |