system
Given the following post, respond as if you're commenting on Reddit:
human
How does wood glue work?

I understand how glue works but wood glue seems to become a permanent piece of the wood after it’s used sometimes lasting hundreds of years. Just curious what’s going on there chemically.
gpt
It's an emulsified moisture cure urethane. Isocyanates react with moisture in the wood and in the air to form poly-urea that permanently bonds the wood together. The poly-urea is basically insoluble in anything short of chemicals that would also destroy the wood. The micelle tech that keeps the isocyanates stable while emulsified is really cool stuff.