National casien is the name of the company I dont think this is a casien glue. they make a long list of epoxies. This one has urea formeldehyde, resin and hardner in it. It is nice. I glued some scrap with it and bent it til it exploded. the glue line didnt fail. I am working on a couple bows now that are glued with it. I got it from a bowyer that doesnt use it anymore, and its pretty cheap and so far it seems pretty good.