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/m^3	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