Research Article
Modyfication of the Rigid Polyurethane-Polyisocyanurate Foams
Table 3
Basic utility properties of rigid PUR-PIR foams (numbers of foams as in Table
1)
| No. of foam | Apparent density kg/m3 | Compressive strength kPa | Brittleness % | Softening point °C | Oxygen index % | Retention % | Loss of volume % | Loss of mass % |
| 0 | 36.9 | 221.7 | 41.1 | 230.0 | 22.1 | 76.6 | 0.00 | 0.00 | 1 | 29.4 | 229.3 | 38.3 | 226.6 | 22.5 | 77.7 | −0.5 | 0.2 | 2 | 29.2 | 236.2 | 36.6 | 223.6 | 22.4 | 79.9 | −0.8 | 0.5 | 3 | 29.6 | 239.3 | 30.1 | 221.9 | 22.2 | 82.7 | −1.2 | 0.5 | 4 | 29.8 | 242.1 | 28.7 | 219.7 | 21.8 | 84.4 | −1.0 | 0.4 | 5 | 29.7 | 247.7 | 25.3 | 212.1 | 21.5 | 85.9 | −1.1 | 0.6 | 6 | 29.7 | 250.1 | 22.4 | 209.4 | 22.5 | 87.2 | −0.9 | 0.4 | 7 | 29.6 | 257.2 | 22.0 | 206.1 | 23.2 | 88.3 | −0.9 | 0.5 | 8 | 29.5 | 265.9 | 21.7 | 205.9 | 23.4 | 88.8 | −0.8 | 0.5 |
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