Hey Jason,
Most of the PACIN folks are still posting on the listserv (which has about 800 folks signed up) until a few of them start pitching in over here I will drag comments over and post them.
In answer to your question, off-gassing generally means how a material behaves in its normal state so yes, it is recommended that any material that will be in an proximate to art/objects - especially in an enclosed environment over a long period of time be - chemically stable/inert/archival/acidfree etc....
This usually just referes to what is it made off - Polyethylene foams vs Urethane foams, or how they are processed - Blueboard (where the acidity is balanced by a base buffering agent) vs regular cardboard.
For non-storage use though I think just about any gluegun/stick is ok.