Application of waste products from agricultural-food industry for production of rigid polyurethane-polyisocyanurate foams

Solid parts of the wheat slops (90% w/w of dry mass and 10% w/w of water) were applied as a filler (5–30% w/w in relation to the sum of polyisocyanate and polyol masses) in PUR-PIR composition. Six foams containing different amounts of slops were prepared by this method and then, their physical–mechanical properties i.e. apparent density, compressive strength, brittleness, after-combustion residue, stability of linear dimensions, change of volume, loss in mass (48 h, temp 120 °C), softening point, content of the closed cells and absorbability of water were determined. Moreover, the foams were subjected to thermogravimetric and infrared analyses.