... septum 3)Feature:colorful,durable,recyclable 4)Favorable RED PP CORRUGATED PLASTIC SHEET--- PP Hollow Board --- Introduction: PP ( ... Polypropylene, It has extremely light weight properties of corrugated board which is widely used in packing, advertising, ... food packing etc. 2. Advertising: sign board, shopwindow displays, pop-up displays, exhibition boards, picture frame backing, digital printing and ...