Reply To: Types of glue
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The precise definition of a resin is a chemistry thing, and I do not know any chemistry. I do know resins can be natural. They can be derived from plants. Think of amber for example. You can collect your own from pine — I think you can find instructions on the web to make glue from pine resin. It can also be derived from animals. Shellac is a resin derived from insects. Frankincense is a resin too. I do not know where it comes from, but do know I do not like the smell. Resins are now often artificial. Asphaltite is a resin, this time derived from petroleum bitumens. To get a modern glue from them you generally have to do a lot of stuff to them. For example, epoxy resin needs to be mixed with stuff (the second tube) to serve as a glue. Lots of glues involve one sort of resin or another derived from some modified natural thing or wholly artificial.
I have seen discussions (you can look them up) that say yellow carpenters glue is a resin (aliphatic resin I think) while white PVA glue is not. That has something to do with the different characteristics of white and yellow glue. Not sure any of that helps.