{"id":61,"date":"2015-01-03T16:41:02","date_gmt":"2015-01-03T14:41:02","guid":{"rendered":"http:\/\/komiadesign.fi\/glaston\/hub\/?p=61"},"modified":"2022-11-09T16:50:20","modified_gmt":"2022-11-09T14:50:20","slug":"iridescence-dealing-with-strain-patterns","status":"publish","type":"post","link":"https:\/\/www.glastory.net\/de\/iridescence-dealing-with-strain-patterns\/","title":{"rendered":"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass"},"content":{"rendered":"<p>In recent years, I&#8217;ve been contacted more and more frequently by building designers with a photo of a fa\u00e7ade with a weird stripe or pattern on it. The question I hear: &#8220;Is this acceptable and what can I do\u00a0to\u00a0get rid of it?&#8221;<\/p>\n<p>Read more about the <a title=\"Is anisotropy a defect in tempered glass?\" href=\"https:\/\/www.glastory.net\/anisotropy-defect-tempered-glass\/\">industry thoughts here<\/a> and keep on reading this post if you want\u00a0to get some actionable tips on how to get rid of it.<\/p>\n<p>This phenomenon is called iridescence. Iridescence is a term for stress differences in tempered glass that become visible in certain lighting and viewing conditions.\u00a0Sometimes this effect can be disturbingly visible. The phenomenon is more noticeable when:<\/p>\n<div class='content-column one_half'><ul>\n<li>The degree of polarization is high<\/li>\n<li>The glass is used\u00a0by the seaside<\/li>\n<li>The time is 2 to 3 hours before sunset<\/li>\n<li>The\u00a0glass is observed from\u00a0a low angle<\/li>\n<\/ul>\n<p>Iridescence becomes even more visible with thick glass (8-15 mm) and with heat-strengthened glass. If\u00a0the tempering process is not optimized in terms of condition, parameters and the tempering line itself, it will also affect the\u00a0amount of iridescence.<\/p>\n<p>Visible iridescence does not make the glass bad from a structural perspective,\u00a0but it does make it look like\u00a0low quality. It\u2019s visible \u2013 and usually it should not be.<\/p>\n<p><a title=\"Iridescence in Wikipedia\" href=\"http:\/\/en.wikipedia.org\/wiki\/Iridescence\" target=\"_blank\" rel=\"noopener\">Iridescence in Wikipedia<\/a><\/div><div class='content-column one_half last_column'><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-118 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-1126x845.jpg\" alt=\"\" width=\"1126\" height=\"845\" data-sizes=\"auto\" data-srcset=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-1126x845.jpg 1126w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-300x225.jpg 300w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-640x480.jpg 640w\" sizes=\"(max-width: 1126px) 100vw, 1126px\" \/><noscript><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-118\" src=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-1126x845.jpg\" alt=\"\" width=\"1126\" height=\"845\" srcset=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-1126x845.jpg 1126w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-300x225.jpg 300w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/iri6_quench-furnace-640x480.jpg 640w\" sizes=\"(max-width: 1126px) 100vw, 1126px\" \/><\/noscript><\/div><div class='clear_column'><\/div><\/p>\n<h2>Types and causes of iridescence<\/h2>\n<p>To\u00a0understand how the iridescence can be minimized in a tempering line, it is crucial to understand what causes it. In short:<\/p>\n<blockquote><p>Iridescence is caused by uneven heating or uneven cooling in the tempering process.<\/p><\/blockquote>\n<p>This is already an important distinction. It is not <em>only<\/em>\u00a0about heating, nor is it <em>only<\/em>\u00a0about quenching and cooling. They both have an impact \u2013 so it is about the uniformity of both. If you heat the glass uniformly and quench the glass uniformly, you have no iridescence. However, that is only theoretical with heat-treated tempered glass.<\/p>\n<p>People tend to think that iridescence is caused only by the quench. Surprisingly, the worst iridescence examples usually are caused in\u00a0the heating section. So what impact does the heating then have? It has a major impact. If you create a temperature difference in\u00a0the glass during\u00a0the heating phase, it will stay there throughout the quench and show up as iridescence as a result. A good example of this is when local convection heating is too strong.<\/p>\n<blockquote><p>If you use local heating that is too strong, for example, with convection, you end up with a serious temperature difference that\u00a0results in\u00a0iridescence.<\/p><\/blockquote>\n<p>Quench also plays a large part in iridescence. All non-uniformity shows up as iridescence. This can be rollers conducting a\u00a0cooling effect onto the glass, the quench nozzles blowing quenching air inconsistently\u00a0to different parts of the glass and many other things.<\/p>\n<p><p>Invalid Displayed Gallery<\/p><\/noscript><\/p>\n<h2>5 ways to reduce iridescence in tempered glass<\/h2>\n<p>Now to the part you have all been waiting for. What you can do to minimize the iridescence in your tempered glass:<\/p>\n<p><strong>1. Identify what\u00a0is causing your problem \u2013 your heating or cooling.<\/strong> Go back to the pictures in this post and compare these to your results. Start optimizing the process\u00a0that causes the problems.<\/p>\n<p><strong>2. HEATING:\u00a0Decrease your furnace temperature and increase your heating time.<\/strong> This will heat\u00a0the glass more uniformly and increase your overall quality.<\/p>\n<p><strong>3. HEATING: Set the\u00a0longest possible oscillation length.<\/strong> Utilize the &#8220;crawling function&#8221; in your furnace, if you have one, to minimize the stopping points. Make sure your furnace program supports alternating stopping points.<\/p>\n<p><strong>4. QUENCHING:<\/strong> <strong>Clean your quench nozzles.<\/strong> Make sure you don&#8217;t have any nozzles blocked.<\/p>\n<p><strong>5. QUENCHING: Optimize the first stopping point. <\/strong>Adjust your transfer speed to quench at\u00a0a low level. Aim to have\u00a0the first stopping point in as low temperature as possible.<\/p>\n<p>As a bonus, I want to remind you to\u00a0take good care of your machines. Running with broken heaters will impact your ability to heat the glass uniformly and thus your iridescence.<\/p>\n<p>If you are in the process of buying a new line, make sure you have a so-called shifted\u00a0design heating system with no parallel running lines to minimize this effect.<\/p>\n<p>Did you find a solution to your problem?<br \/>\nIf not,\u00a0send us your question <a title=\"AskGlaston\" href=\"https:\/\/www.glastory.net\/askglaston\/\">here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In recent years, I&#8217;ve been contacted more and more frequently by building designers with a photo of a fa\u00e7ade with a weird stripe or pattern on it. The question I hear: &#8220;Is this acceptable and what can I do\u00a0to\u00a0get rid of it?&#8221; Read more about the industry thoughts here and keep on reading this post [&hellip;]<\/p>\n","protected":false},"author":66,"featured_media":191,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[11],"tags":[6,1160,264,2,81,10,1065,194,257,7,111,265,121,190],"acf":[],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass &ndash; Glastory<\/title>\n<meta name=\"description\" content=\"Weird strain patterns or rainbow-colored streaks after tempering the glass are called glass iridescence. Here&#039;s how to get rid of it.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass &ndash; Glastory\" \/>\n<meta property=\"og:description\" content=\"Weird strain patterns or rainbow-colored streaks after tempering the glass are called glass iridescence. Here&#039;s how to get rid of it.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/\" \/>\n<meta property=\"og:site_name\" content=\"Glastory\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/GlastonCorporation\" \/>\n<meta property=\"article:published_time\" content=\"2015-01-03T14:41:02+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-11-09T14:50:20+00:00\" \/>\n<meta name=\"author\" content=\"Miika \u00c4ppelqvist\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Miika \u00c4ppelqvist\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"3\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.glastory.net\/#organization\",\"name\":\"Glastory\",\"url\":\"https:\/\/www.glastory.net\/\",\"sameAs\":[\"https:\/\/www.youtube.com\/user\/GlastonCorporation\",\"https:\/\/www.instagram.com\/glastoncorp\/\",\"https:\/\/www.linkedin.com\/company\/107541\/\",\"https:\/\/www.facebook.com\/GlastonCorporation\",\"https:\/\/twitter.com\/GlastonCorp\"],\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/www.glastory.net\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.glastory.net\/wp-content\/uploads\/2022\/11\/Glastory_Logo_Final_color.png\",\"contentUrl\":\"https:\/\/www.glastory.net\/wp-content\/uploads\/2022\/11\/Glastory_Logo_Final_color.png\",\"width\":2402,\"height\":1717,\"caption\":\"Glastory\"},\"image\":{\"@id\":\"https:\/\/www.glastory.net\/#\/schema\/logo\/image\/\"}},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.glastory.net\/#website\",\"url\":\"https:\/\/www.glastory.net\/\",\"name\":\"Glastory\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.glastory.net\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.glastory.net\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/\",\"url\":\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/\",\"name\":\"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass &ndash; Glastory\",\"isPartOf\":{\"@id\":\"https:\/\/www.glastory.net\/#website\"},\"datePublished\":\"2015-01-03T14:41:02+00:00\",\"dateModified\":\"2022-11-09T14:50:20+00:00\",\"description\":\"Weird strain patterns or rainbow-colored streaks after tempering the glass are called glass iridescence. Here's how to get rid of it.\",\"breadcrumb\":{\"@id\":\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.glastory.net\/de\/glastory\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass\"}]},{\"@type\":\"Article\",\"@id\":\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/\"},\"author\":{\"name\":\"Miika \u00c4ppelqvist\",\"@id\":\"https:\/\/www.glastory.net\/#\/schema\/person\/07074175c6dae022b7ba8995a8cda8cc\"},\"headline\":\"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass\",\"datePublished\":\"2015-01-03T14:41:02+00:00\",\"dateModified\":\"2022-11-09T14:50:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/\"},\"wordCount\":708,\"publisher\":{\"@id\":\"https:\/\/www.glastory.net\/#organization\"},\"keywords\":[\"anisotropy\",\"architectural\",\"FC Series\",\"featured\",\"flat glass tempering\",\"glass quality\",\"glass tempering\",\"glass tempering process\",\"GlastonAir\",\"iridescence\",\"quality\",\"RC Series\",\"safety glass\",\"tempered glass\"],\"articleSection\":[\"Quality\"],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.glastory.net\/#\/schema\/person\/07074175c6dae022b7ba8995a8cda8cc\",\"name\":\"Miika \u00c4ppelqvist\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/www.glastory.net\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/www.glastory.net\/wp-content\/uploads\/avatars\/66\/1663087690-bpfull.jpg\",\"contentUrl\":\"https:\/\/www.glastory.net\/wp-content\/uploads\/avatars\/66\/1663087690-bpfull.jpg\",\"caption\":\"Miika \u00c4ppelqvist\"},\"description\":\"Encourages transparent solutions in buildings and ways of working. Several years of experience from being a glass-man in product management, sales and projects with a focus on glass heat treatment. Believes helping is the best marketing any company can do. Father of three and a wannabe sportsman with an internal love of ice hockey.\",\"url\":\"https:\/\/www.glastory.net\/de\/author\/appelman\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass &ndash; Glastory","description":"Weird strain patterns or rainbow-colored streaks after tempering the glass are called glass iridescence. Here's how to get rid of it.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/","og_locale":"de_DE","og_type":"article","og_title":"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass &ndash; Glastory","og_description":"Weird strain patterns or rainbow-colored streaks after tempering the glass are called glass iridescence. Here's how to get rid of it.","og_url":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/","og_site_name":"Glastory","article_publisher":"https:\/\/www.facebook.com\/GlastonCorporation","article_published_time":"2015-01-03T14:41:02+00:00","article_modified_time":"2022-11-09T14:50:20+00:00","author":"Miika \u00c4ppelqvist","twitter_misc":{"Verfasst von":"Miika \u00c4ppelqvist","Gesch\u00e4tzte Lesezeit":"3\u00a0Minuten"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/www.glastory.net\/#organization","name":"Glastory","url":"https:\/\/www.glastory.net\/","sameAs":["https:\/\/www.youtube.com\/user\/GlastonCorporation","https:\/\/www.instagram.com\/glastoncorp\/","https:\/\/www.linkedin.com\/company\/107541\/","https:\/\/www.facebook.com\/GlastonCorporation","https:\/\/twitter.com\/GlastonCorp"],"logo":{"@type":"ImageObject","inLanguage":"de","@id":"https:\/\/www.glastory.net\/#\/schema\/logo\/image\/","url":"https:\/\/www.glastory.net\/wp-content\/uploads\/2022\/11\/Glastory_Logo_Final_color.png","contentUrl":"https:\/\/www.glastory.net\/wp-content\/uploads\/2022\/11\/Glastory_Logo_Final_color.png","width":2402,"height":1717,"caption":"Glastory"},"image":{"@id":"https:\/\/www.glastory.net\/#\/schema\/logo\/image\/"}},{"@type":"WebSite","@id":"https:\/\/www.glastory.net\/#website","url":"https:\/\/www.glastory.net\/","name":"Glastory","description":"","publisher":{"@id":"https:\/\/www.glastory.net\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.glastory.net\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"de"},{"@type":"WebPage","@id":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/","url":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/","name":"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass &ndash; Glastory","isPartOf":{"@id":"https:\/\/www.glastory.net\/#website"},"datePublished":"2015-01-03T14:41:02+00:00","dateModified":"2022-11-09T14:50:20+00:00","description":"Weird strain patterns or rainbow-colored streaks after tempering the glass are called glass iridescence. Here's how to get rid of it.","breadcrumb":{"@id":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/#breadcrumb"},"inLanguage":"de","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.glastory.net\/de\/glastory\/"},{"@type":"ListItem","position":2,"name":"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass"}]},{"@type":"Article","@id":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/#article","isPartOf":{"@id":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/"},"author":{"name":"Miika \u00c4ppelqvist","@id":"https:\/\/www.glastory.net\/#\/schema\/person\/07074175c6dae022b7ba8995a8cda8cc"},"headline":"What is iridescence (anisotropy) and 5 ways to reduce it in tempered glass","datePublished":"2015-01-03T14:41:02+00:00","dateModified":"2022-11-09T14:50:20+00:00","mainEntityOfPage":{"@id":"https:\/\/www.glastory.net\/es\/iridescence-dealing-with-strain-patterns\/"},"wordCount":708,"publisher":{"@id":"https:\/\/www.glastory.net\/#organization"},"keywords":["anisotropy","architectural","FC Series","featured","flat glass tempering","glass quality","glass tempering","glass tempering process","GlastonAir","iridescence","quality","RC Series","safety glass","tempered glass"],"articleSection":["Quality"],"inLanguage":"de"},{"@type":"Person","@id":"https:\/\/www.glastory.net\/#\/schema\/person\/07074175c6dae022b7ba8995a8cda8cc","name":"Miika \u00c4ppelqvist","image":{"@type":"ImageObject","inLanguage":"de","@id":"https:\/\/www.glastory.net\/#\/schema\/person\/image\/","url":"https:\/\/www.glastory.net\/wp-content\/uploads\/avatars\/66\/1663087690-bpfull.jpg","contentUrl":"https:\/\/www.glastory.net\/wp-content\/uploads\/avatars\/66\/1663087690-bpfull.jpg","caption":"Miika \u00c4ppelqvist"},"description":"Encourages transparent solutions in buildings and ways of working. Several years of experience from being a glass-man in product management, sales and projects with a focus on glass heat treatment. Believes helping is the best marketing any company can do. Father of three and a wannabe sportsman with an internal love of ice hockey.","url":"https:\/\/www.glastory.net\/de\/author\/appelman\/"}]}},"_links":{"self":[{"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/posts\/61"}],"collection":[{"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/users\/66"}],"replies":[{"embeddable":true,"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/comments?post=61"}],"version-history":[{"count":19,"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/posts\/61\/revisions"}],"predecessor-version":[{"id":7777,"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/posts\/61\/revisions\/7777"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/media\/191"}],"wp:attachment":[{"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/media?parent=61"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/categories?post=61"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glastory.net\/de\/wp-json\/wp\/v2\/tags?post=61"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}