EPDM foam sheet : Open cell epdm foam is one kind of rubber and plastic foaming products, EPDM have open cell pore and closed cell pore. The internal cells of EPDM closed cell pore foam material are separated by cell wall membranes, they don't link together, belonging to independent cell structure, and mainly are the smaller bubble hole shape or extremely small micropore. The Internal cells of EPDM open cell pore foam material are link together with each other and also link with the outer skin, belongs to non-independent cell structure, and mainly are larger bubble holes or rough holes.