Paperboard

Paperboard is a thick paper-based material. According to ISO standards, paperboard is a paper with a grammage above 250 g/m, but there are exceptions. Paperboard can be single- or multi-ply. The related term box board dates at least to the 1790s. Terminology and classifications of paperboard are not always uniform. To produce paperboard, fibrous material is turned into pulp and bleached to create one or more layers of board, which can be optionally coated for a better surface and/or improved appearance.