I currently have 26 Ikea Flarke shelf units holding books, databooks
and manuals
which I think are no longer available and they are chipboard so have
"some" wood in them.
They do bend a bit, but why worry about what they are made of it is
the contents that matter.
I see the archive purists screaming about use of plastics (out
gassing) etc, but in the case of records
and sleeves you have a large percentage of plastics in the make up of the item.
I see plastic coatings in use in a lot of items, we just have to get
used to the degradation over time until someone finds a real cure or
method of stabilizing random unknown plastics.
Dave Caroline