The rigid polyurethane-poyisocyanurate foams containing from 5% to 25% w/w of the following fillers: aluminium hydroxide, chalk and borax have been prepared. The increase in aluminium hydroxide and chalk resulted in the increase in conipressive strength of foams. Addition of chalk and borax resulted in the reduction of brittleness and softening point. On the basis of results, it was found that aluminium hydroxide, chalk and borax were the additives improving properties of rigid PUR-PIR foams.
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