Abstract: Rigid polyurethane foam was prepared using a third generation blowing agent HFC365mfc. The factors influencing the properties of the foam including isocyanate index, dosage, and foaming dynamics were studied. When the isocyanate index was about 1.2, blowing agent dosage was 25 phr, the foam provided the optimal comprehensive properties, which were better than those with HCFC141b and water. The foaming technology using HFC365mfc and HCFC141b was similar, and the blowing agent HFC365mfc could be easily applied.

Key words: rigid polyurethane foam, foaming agent, isocyanate index, compression strength