{"id":831,"date":"2026-07-08T08:22:00","date_gmt":"2026-07-08T00:22:00","guid":{"rendered":"https:\/\/www.han-sphere.com\/?p=831"},"modified":"2026-07-06T10:41:33","modified_gmt":"2026-07-06T02:41:33","slug":"what-is-fr4-pcb-material","status":"publish","type":"post","link":"https:\/\/www.han-sphere.com\/de\/blog\/news\/what-is-fr4-pcb-material\/","title":{"rendered":"Was ist FR4-Leiterplattenmaterial?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">FR4 is the most common material used to manufacture printed circuit boards. From consumer electronics and industrial controllers to communication equipment and medical devices, millions of PCBs are built on FR4 every year.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its popularity comes from a balanced combination of electrical performance, mechanical strength, thermal stability, and manufacturing cost. While many specialized PCB materials are available today, FR4 remains the first choice for most standard applications.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"http:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB.jpg\" alt=\"FR4 PCB\" class=\"wp-image-833\" srcset=\"https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB.jpg 600w, https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-300x200.jpg 300w, https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">What Does FR4 Mean?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 stands for <strong>Flame Retardant 4<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The &#8220;FR&#8221; indicates that the material meets specific flame-retardant requirements, while the number &#8220;4&#8221; identifies the grade within the NEMA (National Electrical Manufacturers Association) classification system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 is not the name of a single manufacturer&#8217;s product. Instead, it refers to a category of fiberglass-reinforced epoxy laminates that meet similar performance standards.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although different laminate manufacturers use different resin formulations and fiberglass styles, most FR4 materials share similar characteristics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Is FR4 Made Of?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 is a composite material consisting of two primary components.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Fiberglass Cloth<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Woven fiberglass provides mechanical strength and dimensional stability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It helps the PCB maintain its shape during drilling, assembly, and long-term operation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Epoxy Resin<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The epoxy resin bonds the fiberglass layers together and provides electrical insulation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It also contributes to moisture resistance and flame-retardant performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After the fiberglass is impregnated with epoxy resin and cured under heat and pressure, the result is a rigid laminate suitable for PCB fabrication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Copper foil is then laminated onto one or both sides of the substrate to create the conductive layers used in printed circuit boards.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why FR4 Is the Most Common PCB Material<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 has remained the industry standard because it performs well across a wide range of applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its main advantages include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Good electrical insulation<\/li>\n\n\n\n<li>High mechanical strength<\/li>\n\n\n\n<li>Stable dimensions during manufacturing<\/li>\n\n\n\n<li>Reliable thermal performance for most applications<\/li>\n\n\n\n<li>Good moisture resistance<\/li>\n\n\n\n<li>Broad compatibility with PCB fabrication processes<\/li>\n\n\n\n<li>Competitive material cost<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Rather than excelling in only one area, FR4 offers a practical balance of performance and affordability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Typical Properties of FR4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Although specifications vary between laminate manufacturers, standard FR4 generally provides the following characteristics.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Eigentum<\/th><th>Typischer Wert<\/th><\/tr><\/thead><tbody><tr><td>Dielektrizit\u00e4tskonstante (Dk)<\/td><td>4,2\u20134,8<\/td><\/tr><tr><td>W\u00e4rmeleitf\u00e4higkeit<\/td><td>0.25\u20130.35 W\/m\u00b7K<\/td><\/tr><tr><td>Glas\u00fcbergangstemperatur (Tg)<\/td><td>Approximately 130\u2013170\u00b0C<\/td><\/tr><tr><td>Brandschutzklasse<\/td><td>UL94 V-0<\/td><\/tr><tr><td>Feuchtigkeitsabsorption<\/td><td>Approximately 0.10\u20130.20%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These values should be considered typical ranges rather than fixed specifications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weiterf\u00fchrende Lekt\u00fcre:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/www.han-sphere.com\/blog\/news\/fr4-material-properties\/\">Eigenschaften des FR4-Materials, die die Leistung von Leiterplatten beeinflussen<\/a><\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.han-sphere.com\/blog\/news\/fr4-dielectric-constant-er-vs-frequency\/\">FR4 Dielektrizit\u00e4tskonstante (Er) vs. Frequenz erkl\u00e4rt<\/a><\/strong><\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"http:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-1.jpg\" alt=\"FR4 PCB\" class=\"wp-image-834\" srcset=\"https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-1.jpg 600w, https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-1-300x200.jpg 300w, https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Common Applications of FR4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 is suitable for many types of electronic products.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zu den \u00fcblichen Anwendungen geh\u00f6ren:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Unterhaltungselektronik<\/li>\n\n\n\n<li>Industrial automation<\/li>\n\n\n\n<li>Medizinische Ger\u00e4te<\/li>\n\n\n\n<li>Kommunikationsger\u00e4te<\/li>\n\n\n\n<li>Stromversorgungen<\/li>\n\n\n\n<li>Test and measurement equipment<\/li>\n\n\n\n<li>Security systems<\/li>\n\n\n\n<li>Smart home products<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For these applications, FR4 provides sufficient electrical and mechanical performance without significantly increasing manufacturing cost.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Advantages of FR4 PCB Material<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Excellent Cost-to-Performance Balance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">One of the biggest reasons for FR4&#8217;s popularity is its balance between performance and cost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For many PCB projects, it delivers all the required characteristics without the need for premium materials.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Reliable Mechanical Strength<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Fiberglass reinforcement gives FR4 excellent rigidity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It resists bending and deformation during manufacturing and assembly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Good Electrical Insulation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 provides high insulation resistance between conductive layers, making it suitable for single-sided, double-sided, and multilayer PCBs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ausgereifter Herstellungsprozess<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Virtually every PCB manufacturer supports FR4 fabrication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This broad availability helps reduce production lead times and material costs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Limitations of FR4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Although FR4 is versatile, it is not suitable for every application.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Limited Thermal Conductivity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 transfers heat relatively slowly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">High-power products often require additional thermal management or alternative materials.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weiterf\u00fchrende Lekt\u00fcre:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Erl\u00e4uterung der W\u00e4rmeleitf\u00e4higkeit von FR4 im Leiterplatten-Design<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Not Ideal for High-Frequency Circuits<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">At microwave and millimeter-wave frequencies, dielectric loss becomes more significant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Low-loss materials are generally preferred for RF applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weiterf\u00fchrende Lekt\u00fcre:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/www.han-sphere.com\/blog\/news\/fr4-vs-rogers-pcb-high-frequency-design\/\">FR4 vs. Rogers PCB f\u00fcr Hochfrequenzdesign<\/a><\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.han-sphere.com\/blog\/news\/low-loss-pcb-materials-rf-microwave-circuits\/\">Verlustarme PCB-Materialien f\u00fcr RF- und Mikrowellenschaltungen<\/a><\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Temperaturbegrenzungen<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Standard FR4 performs well under normal operating conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Applications exposed to higher temperatures may require High-Tg laminates for improved thermal stability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Weiterf\u00fchrende Lekt\u00fcre:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/www.han-sphere.com\/blog\/news\/high-tg-pcb-material\/\">Leiterplattenmaterial mit hoher Glas\u00fcbergangstemperatur (Tg) f\u00fcr Hochtemperatur- und zuverl\u00e4ssige Leiterplattenanwendungen<\/a><\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.han-sphere.com\/blog\/news\/when-to-choose-high-tg-pcb-material\/\">Wann sollten Sie sich f\u00fcr ein Leiterplattenmaterial mit hohem Tg entscheiden?<\/a><\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How FR4 Compares with Other PCB Materials<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Compared with specialized materials, FR4 is designed as a general-purpose laminate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zum Beispiel:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ceramic materials provide much higher thermal conductivity.<\/li>\n\n\n\n<li>Rogers laminates offer lower dielectric loss for high-frequency circuits.<\/li>\n\n\n\n<li>High-Tg laminates improve thermal stability for demanding environments.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Each material serves different application requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 remains the preferred option whenever its performance matches the product&#8217;s electrical, thermal, and mechanical needs.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"400\" src=\"http:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-2.jpg\" alt=\"FR4 PCB\" class=\"wp-image-835\" srcset=\"https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-2.jpg 600w, https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-2-300x200.jpg 300w, https:\/\/www.han-sphere.com\/wp-content\/uploads\/2026\/07\/FR4-PCB-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Choosing the Right FR4 Material<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not all FR4 laminates are identical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When selecting a material, consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Operating temperature<\/li>\n\n\n\n<li>Signal frequency<\/li>\n\n\n\n<li>Anzahl der Schichten<\/li>\n\n\n\n<li>Product operating environment<\/li>\n\n\n\n<li>Reliability requirements<\/li>\n\n\n\n<li>Manufacturing budget<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Matching the material to the application&#8217;s actual requirements usually leads to better long-term performance than simply choosing the highest specification.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Choose FR4 PCB Material<\/h2>\n\n\n\n<div class=\"schema-how-to wp-block-yoast-how-to-block\"><p class=\"schema-how-to-description\"><\/p> <ol class=\"schema-how-to-steps\"><li class=\"schema-how-to-step\" id=\"how-to-step-1783305156530\"><strong class=\"schema-how-to-step-name\">Schritt 1<\/strong> <p class=\"schema-how-to-step-text\">Define the electrical, thermal, and mechanical requirements of the product.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1783305164249\"><strong class=\"schema-how-to-step-name\">Schritt 2<\/strong> <p class=\"schema-how-to-step-text\">Determine whether standard FR4 or High-Tg FR4 better matches the operating environment.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1783305170190\"><strong class=\"schema-how-to-step-name\">Schritt 3<\/strong> <p class=\"schema-how-to-step-text\">Review the PCB layer count, operating frequency, and expected service life.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1783305177366\"><strong class=\"schema-how-to-step-name\">Schritt 4<\/strong> <p class=\"schema-how-to-step-text\">Confirm the laminate specification with your PCB manufacturer before starting fabrication.<\/p> <\/li><\/ol><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Schlussfolgerung<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">FR4 has become the industry standard because it combines reliable electrical insulation, mechanical strength, thermal stability, and cost-effective manufacturing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While specialized materials are available for high-frequency, high-power, or high-temperature applications, FR4 continues to provide the best overall balance for most commercial and industrial PCBs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selecting the appropriate FR4 grade early in the project helps improve manufacturability, product reliability, and overall production efficiency.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">H\u00e4ufig gestellte Fragen<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1783304939850\"><strong class=\"schema-faq-question\">Q: What is FR4 PCB material?<\/strong> <p class=\"schema-faq-answer\">A: FR4 is a flame-retardant fiberglass-reinforced epoxy laminate widely used as the base material for printed circuit boards.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783305091508\"><strong class=\"schema-faq-question\">Q: Why is FR4 the most commonly used PCB material?<\/strong> <p class=\"schema-faq-answer\">A: It offers a balanced combination of electrical insulation, mechanical strength, thermal stability, manufacturability, and cost efficiency.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783305101415\"><strong class=\"schema-faq-question\">F: Eignet sich FR4 f\u00fcr den Entwurf von Hochfrequenz-Leiterplatten?<\/strong> <p class=\"schema-faq-answer\">A: FR4 can be used for many digital circuits, but low-loss materials are generally preferred for microwave and high-frequency RF applications.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783305113590\"><strong class=\"schema-faq-question\">Q: What is the difference between standard FR4 and High-Tg FR4?<\/strong> <p class=\"schema-faq-answer\">A: High-Tg FR4 has a higher glass transition temperature, making it more suitable for applications exposed to higher operating temperatures or repeated thermal cycling.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783305124294\"><strong class=\"schema-faq-question\">Q: Can FR4 be used for multilayer PCBs?<\/strong> <p class=\"schema-faq-answer\">A: Yes. FR4 is widely used for multilayer PCB fabrication because of its dimensional stability, electrical insulation, and compatibility with standard manufacturing processes.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>FR4 ist das in der Elektronikindustrie am h\u00e4ufigsten verwendete Leiterplattensubstrat. Es vereint gute elektrische Isolation, mechanische Festigkeit, thermische Stabilit\u00e4t und Kosteneffizienz und eignet sich daher f\u00fcr eine Vielzahl von Anwendungen im gewerblichen und industriellen Bereich. In diesem Artikel wird erl\u00e4utert, was FR4 ist, wie es hergestellt wird, welche Eigenschaften und Vorteile es bietet, welche Einschr\u00e4nkungen es gibt und wann es die richtige Wahl f\u00fcr ein Leiterplattenprojekt ist.<\/p>","protected":false},"author":1,"featured_media":832,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[4],"tags":[70],"class_list":["post-831","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-fr4-pcb-material"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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