Sell Cheap PolyfoamPolyfoam is a plastic sheet with polystirene processed in foam, commonly called the PS foam board. Polyfoam is very lightweight, with a flat and smooth surface on both sides with sparkling white and black pearl effects. Polyfoam is suitable for poster and sticker attachment media, light product displays, 3D embossed letters and packaging. We, PT. Diblestari Djauhari sells quality polyfoam at low prices.