How is cardboard different from paperboard?
Corrugated cardboard has the waffled inner layer sandwiched between two flat pieces of usually brown material. Packing boxes are made of corrugated cardboard. Paperboard, also called grayboard, is the flat material, typically gray or brown in color. Paperboard is what cereal and cracker boxes, six-pack cartons, and paper towel rolls are made of. In many cases, paperboard has a color, glossy side with the product information on it and a dull gray or brown side. Sometimes, as with paper towel rolls or the backs of legal pads of paper, both sides are unfinished. Paperboard is NOT recycled with cardboard but should be included with MIXED PAPER. You may also encounter paperboard that is white. This is also considered MIXED PAPER unless it is a frozen food box. Freezer boxes have a moisture-resistant coating on them that make them unrecyclable.
