{"id":30266,"date":"2021-10-10T13:27:00","date_gmt":"2021-10-10T10:27:00","guid":{"rendered":"https:\/\/componentbyozdisan.com\/?p=30266"},"modified":"2025-10-23T09:22:32","modified_gmt":"2025-10-23T06:22:32","slug":"what-is-fr4-material","status":"publish","type":"post","link":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/","title":{"rendered":"What is FR4 Material?"},"content":{"rendered":"
\n
\"\"
M\u0130RA\u00c7 BAKICI
PCB DEPARTMENT MANAGER<\/strong><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n

FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant. Structurally, it is a composite material consisting of woven fiberglass fabric with epoxy resin binder.<\/p>\n\n\n\n

Example of FR4 weaving<\/strong><\/strong><\/h4>\n\n\n\n

Having a good strength-to-weight ratio, FR4 is highly resistant to harsh environmental conditions. With little moisture absorption, it is widely preferred as an electrical insulator with heat and mechanical strength. It is compatible with all types as the final coating (Finished Type) in PCB production.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n
\u201cThe main body of multilayer PCBs is called the core (Fr4 core), and the outer insulation structures are called PP (Fr4 Prepreg).\u201d<\/strong><\/h5>\n\n\n
\n
\"FR4\"<\/figure>\n<\/div>\n\n\n

Today, it is a standard for in-hole coating. It is not that suitable for molded (cutting, drilling holes) production. It is possible to use single-layer, double-layer and multi-layer PCB types. Today, we can call it the \u201cstandard\u201d and the first material type that comes to mind for PCB. \u201cThe main body of multilayer PCBs is called the core (Fr4 core), and the outer insulation structures are called PP (Fr4 Prepreg).\u201d Here are some main parameters that may be important when selecting the FR4 material.<\/p>\n\n\n\n

Dielectric Constant \u2013 Permittivity<\/strong><\/strong><\/h4>\n\n\n\n

It is an important parameter for signal integrity and impedance in high frequency electrical circuits. For most FR4 materials, this value is in the range of Er, 2.2 to 4.7. The dielectric constant varies with frequency and usually decreases as the frequency increases.<\/p>\n\n\n

\n
\"FR4\"<\/figure>\n<\/div>\n\n\n

Loss Factor<\/strong><\/strong><\/h4>\n\n\n\n

It is a measure of power that is lost due to the material. The lower this value, the less power is lost. At the same time, this loss also changes with frequency. The loss tangent is important in very high frequency circuits (usually above 1GHz).<\/p>\n\n\n\n

CTI<\/strong><\/h4>\n\n\n\n

It measures the ability of the PCB material to resist electrical deterioration in the Z-direction (inter-surface) of the PCB. It is expressed in Volts.<\/p>\n\n\n\n

Tg<\/strong><\/h4>\n\n\n\n

It is the temperature at which the material transforms from a reasonably hard, glass-like substance into a more flexible and bendable, plastic-like material. This value is important both for board-placement and the working environment performance. A normal Tg is considered to be 130\u00b0C, medium Tg is considered to be 150\u00b0C, and high Tg is considered to be 170\u00b0C and above.<\/p>\n\n\n\n

Td<\/strong><\/h4>\n\n\n\n

This is a measure of deterioration of the material. The analysis method measures the time when 5% of the material is lost with weight. This creates a breach of reliability and delamination. High reliability requires \u201cPCB Td \u2265340\u00b0C\u201d.<\/p>\n\n\n\n

Coefficient of Thermal Expansion (CTE)<\/strong><\/h4>\n\n\n\n

It is the expansion rate during heating of the material. The CTE of a material is usually much higher than that of copper, which can cause coupling issues when the PCB is heated.<\/p>\n\n\n\n

Halogen Material (HalogenFree)<\/strong><\/strong><\/h4>\n\n\n\n

It refers to the materials that do not contain fluorine, chlorine or bromine. Halogen-containing materials produce toxic gases when burning. Therefore, halogen-free material may have to be preferred according to the application.<\/p>\n\n\n\n

CAF (Anti-CAF Material)<\/strong><\/strong><\/h4>\n\n\n\n

CAFs are metal filaments that can grow from copper through perforated coating along glass fibers embedded in PCB materials. Eventually, they can create a short \/ open circuit that negatively affects the reliability of products in the field. Anti-CAF material should be preferred to prevent this problem.<\/p>\n","protected":false},"excerpt":{"rendered":"

FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant. Structurally, it is a composite material consisting of woven fiberglass fabric with epoxy resin binder. Example of FR4 weaving Having a good strength-to-weight ratio, FR4 is highly resistant to harsh environmental conditions. With little moisture absorption, it is […]<\/p>\n","protected":false},"author":1,"featured_media":14472,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2427,2079],"tags":[2428,2190],"class_list":["post-30266","post","type-post","status-publish","format-standard","has-post-thumbnail","category-17-issue","category-expertopinion","tag-17-issue","tag-expertopinion"],"yoast_head":"\nWhat is FR4 Material? - Component By \u00d6zdisan<\/title>\n<meta name=\"description\" content=\"FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is FR4 Material? - Component By \u00d6zdisan\" \/>\n<meta property=\"og:description\" content=\"FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant\" \/>\n<meta property=\"og:url\" content=\"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/\" \/>\n<meta property=\"og:site_name\" content=\"Component By \u00d6zdisan\" \/>\n<meta property=\"article:published_time\" content=\"2021-10-10T10:27:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-23T06:22:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2021\/10\/FR4-kpk.png\" \/>\n\t<meta property=\"og:image:width\" content=\"323\" \/>\n\t<meta property=\"og:image:height\" content=\"323\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Yonetici\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Yonetici\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/\"},\"author\":{\"name\":\"Yonetici\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#\\\/schema\\\/person\\\/b8881d213a434962c5d126ce57930fd3\"},\"headline\":\"What is FR4 Material?\",\"datePublished\":\"2021-10-10T10:27:00+00:00\",\"dateModified\":\"2025-10-23T06:22:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/\"},\"wordCount\":532,\"publisher\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/componentbyozdisan.com\\\/wp-content\\\/uploads\\\/2021\\\/10\\\/FR4-kpk.png\",\"keywords\":[\"17. Issue\",\"ExpertOpinion\"],\"articleSection\":[\"17. Issue\",\"Expert Opinion\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/\",\"url\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/\",\"name\":\"What is FR4 Material? - Component By \u00d6zdisan\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/componentbyozdisan.com\\\/wp-content\\\/uploads\\\/2021\\\/10\\\/FR4-kpk.png\",\"datePublished\":\"2021-10-10T10:27:00+00:00\",\"dateModified\":\"2025-10-23T06:22:32+00:00\",\"description\":\"FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/#primaryimage\",\"url\":\"https:\\\/\\\/componentbyozdisan.com\\\/wp-content\\\/uploads\\\/2021\\\/10\\\/FR4-kpk.png\",\"contentUrl\":\"https:\\\/\\\/componentbyozdisan.com\\\/wp-content\\\/uploads\\\/2021\\\/10\\\/FR4-kpk.png\",\"width\":323,\"height\":323},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/what-is-fr4-material\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Anasayfa\",\"item\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/homepage\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What is FR4 Material?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/\",\"name\":\"Component By \u00d6zdisan\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#organization\",\"name\":\"Component By \u00d6zdisan\",\"url\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/componentbyozdisan.com\\\/wp-content\\\/uploads\\\/2024\\\/03\\\/componentbyozdisan-logo.png\",\"contentUrl\":\"https:\\\/\\\/componentbyozdisan.com\\\/wp-content\\\/uploads\\\/2024\\\/03\\\/componentbyozdisan-logo.png\",\"width\":508,\"height\":108,\"caption\":\"Component By \u00d6zdisan\"},\"image\":{\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.instagram.com\\\/ozdisan\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/#\\\/schema\\\/person\\\/b8881d213a434962c5d126ce57930fd3\",\"name\":\"Yonetici\",\"sameAs\":[\"http:\\\/\\\/componenttoproduction.com\"],\"url\":\"https:\\\/\\\/componentbyozdisan.com\\\/en\\\/author\\\/yonetici\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What is FR4 Material? - Component By \u00d6zdisan","description":"FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant","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:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/","og_locale":"en_US","og_type":"article","og_title":"What is FR4 Material? - Component By \u00d6zdisan","og_description":"FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant","og_url":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/","og_site_name":"Component By \u00d6zdisan","article_published_time":"2021-10-10T10:27:00+00:00","article_modified_time":"2025-10-23T06:22:32+00:00","og_image":[{"width":323,"height":323,"url":"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2021\/10\/FR4-kpk.png","type":"image\/png"}],"author":"Yonetici","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Yonetici","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/#article","isPartOf":{"@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/"},"author":{"name":"Yonetici","@id":"https:\/\/componentbyozdisan.com\/en\/#\/schema\/person\/b8881d213a434962c5d126ce57930fd3"},"headline":"What is FR4 Material?","datePublished":"2021-10-10T10:27:00+00:00","dateModified":"2025-10-23T06:22:32+00:00","mainEntityOfPage":{"@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/"},"wordCount":532,"publisher":{"@id":"https:\/\/componentbyozdisan.com\/en\/#organization"},"image":{"@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/#primaryimage"},"thumbnailUrl":"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2021\/10\/FR4-kpk.png","keywords":["17. Issue","ExpertOpinion"],"articleSection":["17. Issue","Expert Opinion"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/","url":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/","name":"What is FR4 Material? - Component By \u00d6zdisan","isPartOf":{"@id":"https:\/\/componentbyozdisan.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/#primaryimage"},"image":{"@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/#primaryimage"},"thumbnailUrl":"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2021\/10\/FR4-kpk.png","datePublished":"2021-10-10T10:27:00+00:00","dateModified":"2025-10-23T06:22:32+00:00","description":"FR4 (Flame Retardant 4), created by NEMA (National Electrical Manufacturers Association) in 1968, stands for flame retardant","breadcrumb":{"@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/#primaryimage","url":"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2021\/10\/FR4-kpk.png","contentUrl":"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2021\/10\/FR4-kpk.png","width":323,"height":323},{"@type":"BreadcrumbList","@id":"https:\/\/componentbyozdisan.com\/en\/what-is-fr4-material\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Anasayfa","item":"https:\/\/componentbyozdisan.com\/en\/homepage\/"},{"@type":"ListItem","position":2,"name":"What is FR4 Material?"}]},{"@type":"WebSite","@id":"https:\/\/componentbyozdisan.com\/en\/#website","url":"https:\/\/componentbyozdisan.com\/en\/","name":"Component By \u00d6zdisan","description":"","publisher":{"@id":"https:\/\/componentbyozdisan.com\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/componentbyozdisan.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/componentbyozdisan.com\/en\/#organization","name":"Component By \u00d6zdisan","url":"https:\/\/componentbyozdisan.com\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/componentbyozdisan.com\/en\/#\/schema\/logo\/image\/","url":"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2024\/03\/componentbyozdisan-logo.png","contentUrl":"https:\/\/componentbyozdisan.com\/wp-content\/uploads\/2024\/03\/componentbyozdisan-logo.png","width":508,"height":108,"caption":"Component By \u00d6zdisan"},"image":{"@id":"https:\/\/componentbyozdisan.com\/en\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.instagram.com\/ozdisan"]},{"@type":"Person","@id":"https:\/\/componentbyozdisan.com\/en\/#\/schema\/person\/b8881d213a434962c5d126ce57930fd3","name":"Yonetici","sameAs":["http:\/\/componenttoproduction.com"],"url":"https:\/\/componentbyozdisan.com\/en\/author\/yonetici\/"}]}},"_links":{"self":[{"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/posts\/30266","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/comments?post=30266"}],"version-history":[{"count":2,"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/posts\/30266\/revisions"}],"predecessor-version":[{"id":30272,"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/posts\/30266\/revisions\/30272"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/media\/14472"}],"wp:attachment":[{"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/media?parent=30266"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/categories?post=30266"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/componentbyozdisan.com\/en\/wp-json\/wp\/v2\/tags?post=30266"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}