
1) Art material 2) Cardboard 3) Composition board 4) English invention 5) Poster board 6) Posterboard
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https://www.crosswordclues.com/clue/paperboard

1) Poster board
Found on
https://www.crosswordclues.com/clue/paperboard

Paperboard is a thick paper-based material. While there is no rigid differentiation between paper and paperboard, paperboard is generally thicker (usually over 0.25 mm, 0.010 in, or 10 points) than paper. According to ISO standards, paperboard is a paper with a basis weight (grammage) above 224 g/m2, but there are exceptions. Paperboard can be sin...
Found on
http://en.wikipedia.org/wiki/Paperboard

(from the article `papermaking`) Converters of paper and paperboard have also turned to new materials combined with paper and paperboard to give their products special ... The term paperboard is a general term that is descriptive of products which are 0.30 millimetre (0.012 inch) or more in thickness, made of fibrous ... ...because o...
Found on
http://www.britannica.com/eb/a-z/p/14

General term for heavyweight grades of paper that are used for containers, boxes, cartons and packaging materials. It is divided into: Containerboard, Boxboard and Other Paperboard.
Found on
http://www.encyclo.co.uk/local/20096

Paper with a caliper greater than .012 inches, or 12 points. Paperboard is used primarily for packaging and construction materials. Paperboard doesn't need to have the same white- ness and brightness as premium printing and writing papers, and because the process of de-inking is less important in its manufacture, it is a perfect product for using r...
Found on
http://www.encyclo.co.uk/local/20829

[
n] - a cardboard suitable for making posters
Found on
http://www.webdictionary.co.uk/definition.php?query=paperboard
poster board noun a cardboard suitable for making posters
Found on
https://www.encyclo.co.uk/local/20974

Any paper with a thickness (caliper) of 12 points (.3mm) or more.
Found on
https://www.encyclo.co.uk/local/22539
No exact match found.