The density of the foams was determined by measuring thedimensions of parallelepiped-shaped samples (with dimensionsof 30 mm × 30 mm × 15 mm) with a digital caliper (Mitutoyo CD-15DC), and their mass with an electronic balance (Mettler ToledoML503). The presented density of each composition was deter-mined as the average of the results obtained on 8 test specimens.