Flame retardant properties of s-triazine phosphonates in PU rigid foams

The liquid flame retardant tris(2-chloro-isopropyl) phosphate (TCPP) is widely used in polyurethane (PUR) and polyisocyanurate rigid foams (PIR). However, TCPP is currently under assessment by the European Chemicals Agency ECHA and the National Toxicology Program NTP, USA. For this reason, new flame retardants with similarly good processing and application properties are of high interest. In this poster, the influence of s-triazine phosphonates on the foaming behavior and flame retardancy of PUR and PIR rigid foams for building applications is discussed. The newly developed flame retardants s-triazine phosphonates improve the flame retardancy of PUR and PIR rigid foams and are able to replace the flame retardant TCPP in PIR rigid foam formulations for building applications without any loss of foam properties.