PE Plastic Corrugated Laminated Sheet is in 4mm and is manufactured in Polyethylene in a very similar way to corrugated fiber. Most commonly made with two flat sheets on each side with a third wave pattern sheet in the middle. Instead of gluing these sheets together they are brought together hot and melted together. The second variety is in the form called single face. This version only has one flat side and the wave pattern is exposed on the opposite side. Single face laminated sheet can be rolled and is much more pliable than the standard sheet.