Editing Chlorine (section)

=== Chlorine-induced cracking in structural materials ===
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[[File:Chlorine attack1.jpg|thumb|Chlorine "attack" on an acetal resin plumbing joint resulting from a fractured acetal joint in a water supply system which started at an [[injection molding]] defect in the joint and slowly grew until the part failed. The fracture surface shows iron and calcium salts that were deposited in the leaking joint from the water supply before failure and are the indirect result of the chlorine attack.]]

Chlorine is widely used for purifying water, especially potable water supplies and water used in swimming pools. Several catastrophic collapses of swimming pool ceilings have occurred from chlorine-induced [[stress corrosion cracking]] of [[stainless steel]] suspension rods.<ref>{{Cite book|url=https://books.google.com/books?id=cEmq232h1zcC&pg=PA148|page=148|title=Corrosion of steel in concrete: prevention, diagnosis, repair|author=Bertolini, Luca|author2=Elsener, Bernhard|author3=Pedeferri, Pietro|author4=Polder, Rob B.|publisher=Wiley-VCH|date=2004|isbn=978-3-527-30800-2|access-date=2020-05-06|archive-date=2023-12-30|archive-url=https://web.archive.org/web/20231230134102/https://books.google.com/books?id=cEmq232h1zcC&pg=PA148#v=onepage&q&f=false|url-status=live}}</ref> Some [[polymer]]s are also sensitive to attack, including [[acetal resin]] and [[polybutene]]. Both materials were used in hot and cold water domestic plumbing, and [[stress corrosion cracking]] caused widespread failures in the US in the 1980s and 1990s.<ref>{{cite book|author=Lewis, P.R.|title=Polymer Product Failure|url=https://books.google.com/books?id=SFm8rKotSaUC&pg=PA19|access-date=2011-04-30|date=1 January 2000|publisher=iSmithers Rapra Publishing|isbn=978-1-85957-192-7|pages=19–|url-status=live|archive-url=https://web.archive.org/web/20130510041524/http://books.google.com/books?id=SFm8rKotSaUC&pg=PA19|archive-date=10 May 2013}}</ref>