ABSTRACT
Rigid Polyisocyanurate-Polyurethane foams (PIR-PUR) have been synthesized with expandable graphite (EG) as the flame retardant halogen free additive. In order to study possible synergistic effects, mixtures of EG and triethylphosphate (TEP) were used to make fire retarded, pentane-blown PIR/PUR foams with a constant NCO index equal to 250. To this point, there has been no commercial production of such rigid PIR/PUR foams using expandable graphite as the fire retardant additive.
This study investigated the influence of the flame retardant additives on the foam physical and mechanical properties, such as compression strength and thermal conductivity. In order to evaluate fire performance, the foams were studied using cone calorimeter analysis and the oxygen index test.
