Greyboard

A board made entirely from waste paper. It may be lined or unlined and is used for a variety of packaging purposes.
Found on http://www.roberthorne.co.uk/contact/glossary/

GREYBOARD

A board made entirely from waste paper. It can be lined or unlined and is used for a variety of packaging purposes.
Found on http://www.encyclo.co.uk/local/21179
No exact match found