ISP PP 73 series are decorative- wood imitation polyurethane rigid foam systems which blowing agent is HFC – 365mfc/227ea. Polyurethane foam producing from these systems has a fire behaviour B3 grade according to DIN 4102. They are widely used in decorative construction, the foam has a good dimensional stability when they react with PMDI (normal functionality) which is the recommended isocyanate for the formulation.