... . Widely used for advertising and package PP hollow board / coroplast pp boards / pp corrugated board / pp hollow plastic board1.Specification: (1) Thickness ... mm1400g-2500 g/sqm2. Features: 1) PP Hollow Sheet can be electrostatic prevention and electric conduction.2 ... With corona treatment, PP hollow sheet can be used as advertising board, show board, brand mark, light box board, shopwindow displays, ...