Nicholas Bodley skribis:

>
> As to materials, particle board seems to be popular; I
> don't like it, but it is practical (and heavy). Old particle
> board released small amounts of formaldehyde from the
> adhesive that bonds the wood chips, so be cautious
> about old particle-board furniture.

Popular, yes; practical, no. At least for the horizontal
shelves. These need to be solid boards of wood. The
problem with particle board is that it has no stiffness.
At first the shelves will look okay, but after six months,
the weight of the books will cause particle board shelves
to become deeply bowed in the center.

--Ph. D.