board
A generic term for a stiff and thick "paper." The
distinction between board and paper is somewhat
vague; however, in general, board is heavier in
basis weight, thicker, and stiffer than paper.
Most sheets 0.012 or more inches in thickness are
considered to be boards, while nearly all less
than 0.006 inch are termed paper; most of those in
between these dimensions are also classed as
paper. Blotting paper, in excess of 0.012 inch,
however, is still classed as paper, and liner
board, although sometimes less than 0.012 inch
thick, is classed as board. See also: BINDER'S BOARD . (17 , 19 , 42 )