Hi tvel3,
The information you would need to assess the quality of the materials and assess whether it has any obvious weak links and make meaningful comparisons to other mattresses is in this article. Once you have all the information you need then you can compare the quality of the materials to the guidelines here and of course to the other finalists you are considering.
In some cases a factory that only sells their mattresses to retailers and isn’t factory will only provide this information to their retailers (assuming they provide it at all) so I would ask your retailer to call the factory and find out the information you need (if they don’t know it already) rather than trying to find out yourself. Part of the job of any good retailer is to make sure that their customers have all the information they need to make an informed buying decision.
Phoenix