I don't have a lot of knowledge but I thought once it was cooled, it stopped outgassing about as much as its going to. when I've vaccum formed 2part silicone molds the outgas phase is super quick. like 2-5 min? at that point its set up and unless I stick my nose to it I don't smell anything even if I store a bunch of them in a closet for weeks. *after I wash off the release agent- it smells and is greasy.
I personally don't worry about most chemicals/materials after they've "set up". Some adhesives I've worked with were drawn out, but, they also had VERY SLOW setup & cure times(24-48hrs+). Some chemicals will (i don't know if its the right word) leach out of plastics when heated/cooled... but its not outgassing... some processes when working with plastics require heat/wash cycles before you try to bond/work with the material.
I think its about when its hot & being worked that it outgasses, after that I think its as safe as any other abs.
