Editing Adhesive (section)

====Reactive====

=====Anaerobic=====
Anaerobic adhesives cure when in contact with metal, in the absence of oxygen.<ref>{{cite web |title=About anaerobic adhesives |publisher=ThreeBond Holdings Co. |url=https://www.threebond.co.jp/en/technical/seminar/adhesion2.html |access-date=15 September 2018 |archive-date=16 September 2018 |archive-url=https://web.archive.org/web/20180916055843/https://www.threebond.co.jp/en/technical/seminar/adhesion2.html |url-status=live }}</ref> They work well in a close-fitting space, as when used as a [[Thread-locking fluid]].

=====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.

=====Pre-mixed and frozen adhesives=====
''Pre-mixed and frozen adhesives'' (PMFs) are adhesives that are mixed, deaerated, packaged, and frozen.<ref>{{cite book|url=https://books.google.com/books?id=XiRdDgAAQBAJ|title=Polymeric Thermosetting Compounds|publisher=Apple Academic Press|author=Ralph D. Hermansen|page=31|date=16 March 2017|access-date=27 October 2017|isbn=9781771883153}}</ref> As it is necessary for PMFs to remain frozen before use, once they are frozen at −80&nbsp;°C they are shipped with [[dry ice]] and are required to be stored at or below −40&nbsp;°C.<ref>{{cite web|url=http://www.adhesivesmag.com/articles/93547-repackaging-options-for-two-component-adhesives-sealants-and-coatings|title=Repackaging Options for Two-Component Adhesives, Sealants and Coatings|publisher=Adhesives and Sealants Industry|date=5 January 2015|access-date=27 October 2017|archive-date=12 September 2017|archive-url=https://web.archive.org/web/20170912070031/http://www.adhesivesmag.com/articles/93547-repackaging-options-for-two-component-adhesives-sealants-and-coatings|url-status=live}}</ref> PMF adhesives eliminate mixing mistakes by the end user and reduce exposure of curing agents that can contain irritants or toxins.<ref>{{cite book|title=Adhesives Technology for Electronic Applications: Materials, Processing, Reliability|publisher=Elsevier|author1=James J. Licari|author2=Dale W. Swanson|date=2011|page=121|access-date=27 October 2017|url=https://books.google.com/books?id=ZZ5kEWU5aHoC&q=Premixed+and+frozen+adhesives+history&pg=PA28|isbn=9781437778908}}</ref> PMFs were introduced commercially in the 1960s and are commonly used in aerospace and defense.<ref>{{cite web|url=http://www.appli-tec.com/adhesives/history-of-frozen-adhesives/|title=History of Pre-Mixed and Frozen (PMF) Adhesives|publisher=Appli-tec|access-date=27 October 2017}}</ref>

=====One-part=====
''One-part adhesives'' harden via a chemical reaction with an external energy source, such as [[radiation]], heat, and [[moisture]].

[[File:Steeldive SD8205-2.jpg|thumb|A watch with a date magnifying lens ("cyclops"). The cyclops is attached with transparent UV light curing adhesive to the top of the watch crystal.]]

''Ultraviolet'' (UV) ''light curing adhesives'', also known as ''light curing materials'' (LCM), have become popular within the manufacturing sector due to their rapid curing time and strong bond strength. Light curing adhesives can cure in as little as one second and many formulations can bond dissimilar substrates (materials) and withstand harsh temperatures. These qualities make [[UV curing]] adhesives essential to the manufacturing of items in many industrial markets such as electronics, telecommunications, medical, aerospace, glass, and optical. Unlike traditional adhesives, UV light curing adhesives not only bond materials together but they can also be used to seal and coat products. They are generally acrylic-based.

''Heat curing adhesives'' consist of a pre-made mixture of two or more components. When heat is applied the components react and cross-link. This type of adhesive includes [[thermosetting polymer|thermoset]] [[epoxy|epoxies]], [[polyurethane|urethanes]], and [[polyimide]]s.

''Moisture curing adhesives'' cure when they react with moisture present on the substrate surface or in the air. This type of adhesive includes [[cyanoacrylates]] and [[polyurethane|urethanes]].
{{See also|List of polyurethane applications#Adhesives}}