On 04/08/2016 12:11 PM, Tom Gardner wrote: > Sorry, to a EE they are all epoxies, but:
Gorilla glue is an epoxy? News to me. Polyurethane is far from stable over the long term and exhibits hygroscopic properties: For example, vide: http://www.ptonline.com/knowledgecenter/Plastics-Drying/Resin-Types/Hygroscopic-VS-Non-Hygroscopic-Resins ...and many others. Floppy and tape binder also is somewhat of a witches' brew as it usually includes a fatty acid or some other substance for lubrication. As far as "stability", that's subjective. Most plastics will eventually degrade; some are worse than others. There's a big problem in the museum archiving business that not much, other than freezing seems to retard eventual decomposition of plastics. --Chuck
