Editing Adhesive (section)

=====Multi-part=====
''Multi-component adhesives'' harden by mixing two or more components which chemically react. This reaction causes polymers to cross-link<ref>{{Cite book|url=https://books.google.com/books?id=-Y2ykcUBWZsC&q=Multi-component+adhesives+harden+by+mixing+two+or+more+components+which+chemically+react&pg=PA83|title=Plastics: in Architecture and Construction|last1=Engelsmann|first1=Stephan|last2=Spalding|first2=Valerie|last3=Peters|first3=Stefan|date=2010-01-01|publisher=Walter de Gruyter|isbn=9783034611947|language=en}}</ref> into [[Acrylate polymer|acrylates]], [[Carbamate|urethanes]], and [[Epoxy|epoxies]] {{crossreference|(see [[:Thermosetting polymer]])}}.

There are several commercial combinations of multi-component adhesives in use in industry. Some of these combinations are:
* Polyester resin & polyurethane resin
* Polyols & polyurethane resin
* Acrylic polymers & polyurethane resins

The individual components of a multi-component adhesive are not adhesive by nature. The individual components react with each other after being mixed and show full adhesion only on curing. The multi-component resins can be either solvent-based or solvent-less. The solvents present in the adhesives are a medium for the polyester or the polyurethane resin. The solvent is dried during the curing process.