Foaming material can be regarded as a gas filled polymer composite with large amounts of bubbles in a polymer matrix. The merits of low mass

high specific strength

sound-absorbing and heat-insulation make it very competitive in building

automotive industrial

packaging industry

aerospace fields and household electrical appliances. Polypropylene can be well suited to serve as a polymer matrix to prepare foaming material due to its excellent thermal

mechanical properties and chemical stability

foaming PP become the most potential composites in the 21st century after PS and PE foaming material This paper summarized the progress of the preparation methods

cell morphology

modification methods

applications and outlooks of expanded polypropylene (EPP). This paper may provide theoretical foundation for the applications and developments of EPP.