{"id":33192,"date":"2026-08-07T14:26:08","date_gmt":"2026-08-07T06:26:08","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/?p=33192"},"modified":"2026-08-07T14:45:45","modified_gmt":"2026-08-07T06:45:45","slug":"tg150-fr4-pcb-material-specification","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/","title":{"rendered":"TG150 FR4 PCB Material Specification: What to Specify"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#What_Is_TG150_Material_in_a_PCB_Specification\" >What Is TG150 Material in a PCB Specification?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#Is_FR4_TG150_Enough_on_a_Fabrication_Drawing\" >Is FR4 TG150 Enough on a Fabrication Drawing?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#Which_TG_Test_Method_Should_Be_Referenced\" >Which TG Test Method Should Be Referenced?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#What_Should_You_Check_in_an_FR4_TG150_Datasheet\" >What Should You Check in an FR4 TG150 Datasheet?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#Should_You_Specify_a_TG150_Laminate_Brand_or_Allow_an_Equivalent\" >Should You Specify a TG150 Laminate Brand or Allow an Equivalent?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#Does_TG150_Define_Dielectric_Constant\" >Does TG150 Define Dielectric Constant?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#How_Should_Dk_and_Df_Be_Controlled_for_Impedance\" >How Should Dk and Df Be Controlled for Impedance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#Is_a_TG150_PCB_Suitable_for_Lead-Free_Reflow\" >Is a TG150 PCB Suitable for Lead-Free Reflow?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#Does_TG150_Replace_the_PCB_Stackup_Specification\" >Does TG150 Replace the PCB Stackup Specification?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#How_Should_TG150_Material_Substitution_Be_Controlled\" >How Should TG150 Material Substitution Be Controlled?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#What_Should_a_TG150_FR4_PCB_Material_Specification_Include\" >What Should a TG150 FR4 PCB Material Specification Include?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#What_Files_Should_Be_Sent_With_the_TG150_Requirement\" >What Files Should Be Sent With the TG150 Requirement?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/#FAQs_About_TG150_FR4_PCB_Material_Specification\" >FAQs About TG150 FR4 PCB Material Specification<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div>\n<p>A <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/\" title=\"\">TG150 FR4 PCB material specification<\/a> should define more than \u201cFR4 Tg150.\u201d Tg describes only one property of the laminate. If the PCB depends on controlled impedance, repeated lead-free reflow, material traceability, or tighter reliability requirements, the fabrication package should also clarify critical thermal properties, electrical requirements, approved materials, stackup, and substitution rules. The objective is simple: remove material ambiguity without over-specifying the board.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-2.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-2-1024x683.jpg\" alt=\"tg150 fr4 pcb material specification\" class=\"wp-image-33205\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-2-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-2-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-2-768x512.jpg 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-2.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_TG150_Material_in_a_PCB_Specification\"><\/span>What Is TG150 Material in a PCB Specification?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>TG150 material generally refers to an FR4 laminate with a glass transition temperature around the 150\u00b0C class. Tg marks the temperature region where the cured resin changes from a relatively rigid glassy state to a more compliant state.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">However, TG150 does not mean:<\/mark><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The PCB can continuously operate at 150\u00b0C.<\/li>\n\n\n\n<li>Every TG150 laminate has the same thermal reliability.<\/li>\n\n\n\n<li>Every TG150 material has the same Dk or Df.<\/li>\n\n\n\n<li>All TG150 laminates behave identically during lead-free reflow.<\/li>\n<\/ul>\n\n\n\n<p>For fabrication purposes, TG150 should therefore be treated as a material-selection criterion, not a complete laminate specification.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">A basic drawing may begin with:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Base material: FR4, Tg \u2265150\u00b0C<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>Whether more information is required depends on the electrical, thermal, and qualification requirements of the board.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-3.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-3-1024x683.jpg\" alt=\"tg150 fr4 pcb material specification\" class=\"wp-image-33206\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-3-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-3-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-3-768x512.jpg 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-3.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Is_FR4_TG150_Enough_on_a_Fabrication_Drawing\"><\/span>Is FR4 TG150 Enough on a Fabrication Drawing?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For a routine PCB, FR4 TG150 may be enough. For a controlled-impedance, thermally demanding, or qualified product, it is often incomplete.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">A note such as:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Material: FR4, Tg \u2265150\u00b0C<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>still leaves several decisions to the PCB manufacturer.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Depending on the project, the drawing may also need to control:<\/mark><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Approved laminate or equivalent-material rules<\/li>\n\n\n\n<li>Critical thermal properties<\/li>\n\n\n\n<li>Controlled-impedance requirements<\/li>\n\n\n\n<li>Material substitution approval<\/li>\n<\/ul>\n\n\n\n<p>That flexibility is not necessarily bad. For a standard industrial control board, allowing the fabricator to select a qualified TG150 laminate can improve material availability and lead time.<\/p>\n\n\n\n<p>The key is to specify only the properties that affect PCB performance or acceptance. There is little value in copying an entire laminate datasheet onto the fabrication drawing.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Which_TG_Test_Method_Should_Be_Referenced\"><\/span>Which TG Test Method Should Be Referenced?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Tg can be measured using methods such as <strong>DSC<\/strong> or <strong>TMA<\/strong>, and the reported values may differ slightly because the methods evaluate material behavior differently.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">For many commercial PCB projects, this is sufficient:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Tg \u2265150\u00b0C per approved laminate datasheet<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">If the customer needs a defined test basis, the drawing can instead state:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Tg \u2265150\u00b0C by DSC<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>or:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Tg \u2265150\u00b0C by TMA<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>The important rule is consistency. When comparing two laminate options, check whether their Tg values were obtained using the same or comparable test methods.<\/p>\n\n\n\n<p>Unless a specific method is required by the project or qualification plan, using the approved laminate manufacturer&#8217;s published Tg value usually avoids unnecessary material restrictions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-5.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-5-1024x683.jpg\" alt=\"tg150 fr4 pcb material specification\" class=\"wp-image-33207\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-5-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-5-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-5-768x512.jpg 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-5.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Should_You_Check_in_an_FR4_TG150_Datasheet\"><\/span>What Should You Check in an FR4 TG150 Datasheet?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>An FR4 TG150 datasheet should be reviewed as a set of material properties rather than simply checking whether Tg is 150\u00b0C or higher.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Property<\/th><th class=\"has-text-align-center\" data-align=\"center\">Why check it<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Tg<\/td><td class=\"has-text-align-center\" data-align=\"center\">Glass-transition behavior<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Td<\/td><td class=\"has-text-align-center\" data-align=\"center\">Thermal decomposition resistance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Z-axis CTE<\/td><td class=\"has-text-align-center\" data-align=\"center\">Expansion through PCB thickness<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">T260 \/ T288<\/td><td class=\"has-text-align-center\" data-align=\"center\">Resistance to thermal delamination<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Dk<\/td><td class=\"has-text-align-center\" data-align=\"center\">Controlled impedance and signal propagation<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Df<\/td><td class=\"has-text-align-center\" data-align=\"center\">Dielectric loss<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Moisture absorption<\/td><td class=\"has-text-align-center\" data-align=\"center\">Moisture and reflow reliability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Which properties matter depends on the board.<\/p>\n\n\n\n<p>A thick multilayer PCB with many plated through-holes deserves closer attention to Z-axis expansion and thermal durability. A controlled-impedance board needs reliable dielectric data. A board that sees several reflow or rework cycles needs more than a Tg number.<\/p>\n\n\n\n<p>Do not control every datasheet parameter by default. Control the properties that have a measurable impact on the finished PCB.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-6.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-6-1024x683.jpg\" alt=\"tg150 fr4 pcb material specification\" class=\"wp-image-33208\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-6-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-6-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-6-768x512.jpg 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-6.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Should_You_Specify_a_TG150_Laminate_Brand_or_Allow_an_Equivalent\"><\/span>Should You Specify a TG150 Laminate Brand or Allow an Equivalent?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Both approaches can be correct.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Material rule<\/th><th class=\"has-text-align-center\" data-align=\"center\">Best suited to<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Exact laminate required<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Qualified stackups, validated products, regulated applications<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Approved equivalent allowed<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">General PCB production, flexible sourcing, shorter lead time<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>An exact material callout is useful when a particular laminate has already been validated electrically, thermally, or through product qualification.<\/p>\n\n\n\n<p>An approved-equivalent rule gives the PCB manufacturer more flexibility when the project only requires a defined material performance level.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">But \u201cequivalent\u201d should not simply mean:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Same Tg = same material.<\/p>\n<\/blockquote>\n\n\n\n<p>The alternative laminate should meet the properties that made the original material acceptable.<\/p>\n\n\n\n<p>If impedance, thermal cycling, CAF performance, or another characteristic is controlled, the replacement material should be reviewed against those requirements before production.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Does_TG150_Define_Dielectric_Constant\"><\/span>Does TG150 Define Dielectric Constant?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>No. Tg and dielectric constant are different properties.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Two TG150 laminates can have different Dk values because dielectric behavior is influenced by:<\/mark><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Resin system<\/li>\n\n\n\n<li>Glass style<\/li>\n\n\n\n<li>Resin content<\/li>\n\n\n\n<li>Test frequency<\/li>\n\n\n\n<li>Test method<\/li>\n<\/ul>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">This is why using a generic value such as:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>FR4 Dk = 4.5<\/p>\n<\/blockquote>\n\n\n\n<p>for every production stackup can be misleading.<\/p>\n\n\n\n<p>For controlled-impedance designs, use the selected laminate system and the actual production stackup supplied or confirmed by the PCB manufacturer.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">A useful fabrication note is:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Controlled impedance per approved stackup. Final dielectric values to be confirmed before fabrication.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>TG150 tells you the material&#8217;s Tg class. It does not tell you the exact Dk to use for impedance calculation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Should_Dk_and_Df_Be_Controlled_for_Impedance\"><\/span>How Should Dk and Df Be Controlled for Impedance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For a PCB without controlled impedance, tight Dk and Df requirements may add cost without providing practical benefit.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">For impedance-controlled boards, review the complete dielectric system:<\/mark><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Core and prepreg construction<\/li>\n\n\n\n<li>Dielectric thickness<\/li>\n\n\n\n<li><a href=\"https:\/\/www.bestpcbs.com\/blog\/2025\/04\/pcb-copper-thickness-pcb-copper-thickness-tolerance\/\" title=\"\">Copper thickness<\/a><\/li>\n\n\n\n<li>Trace width and spacing<\/li>\n\n\n\n<li>Target impedance<\/li>\n\n\n\n<li>Dk used for calculation<\/li>\n\n\n\n<li>Effect of any material substitution<\/li>\n<\/ul>\n\n\n\n<p>The goal is usually to control the finished impedance, not just a nominal laminate number.<\/p>\n\n\n\n<p>If a fabricator changes to another qualified TG150 laminate, the stackup or trace geometry may need to be recalculated to maintain the specified impedance.<\/p>\n\n\n\n<p>For some products, that adjustment is acceptable. For a previously validated or qualification-controlled design, any material or stackup change may require customer approval.<\/p>\n\n\n\n<p>Control the electrical result first. Lock the exact material only when the project requires it.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-7.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-7-1024x683.jpg\" alt=\"tg150 fr4 pcb material specification\" class=\"wp-image-33209\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-7-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-7-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-7-768x512.jpg 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-7.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Is_a_TG150_PCB_Suitable_for_Lead-Free_Reflow\"><\/span>Is a TG150 PCB Suitable for Lead-Free Reflow?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Yes, many TG150 PCB materials are suitable for lead-free assembly. However, Tg alone does not guarantee performance through repeated thermal cycles.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Additional review becomes more important for:<\/mark><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thick <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/07\/hdi-multilayer-pcb\/\" title=\"\">multilayer PCBs<\/a><\/li>\n\n\n\n<li>Heavy-copper boards<\/li>\n\n\n\n<li>Multiple reflow cycles<\/li>\n\n\n\n<li>Boards expected to undergo rework<\/li>\n\n\n\n<li>High-reliability applications<\/li>\n<\/ul>\n\n\n\n<p>The laminate&#8217;s Td, Z-axis CTE, delamination resistance, moisture behavior, and overall thermal system can matter as much as Tg.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">For a typical project, a practical drawing note may be:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>FR4, Tg \u2265150\u00b0C, lead-free compatible<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>For demanding assemblies, confirm the actual laminate datasheet rather than assuming every TG150 material has identical lead-free process capability.<\/p>\n\n\n\n<p>The decision should be based on the real thermal process, not Tg alone.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-8.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-8-1024x683.jpg\" alt=\"tg150 fr4 pcb material specification\" class=\"wp-image-33210\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-8-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-8-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-8-768x512.jpg 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-8.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Does_TG150_Replace_the_PCB_Stackup_Specification\"><\/span>Does TG150 Replace the PCB Stackup Specification?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>No.<\/p>\n\n\n\n<p>TG150 controls the material class. The stackup controls how the PCB is constructed.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">A proper stackup may define:<\/mark><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Layer sequence<\/li>\n\n\n\n<li>Core thickness<\/li>\n\n\n\n<li>Prepreg thickness<\/li>\n\n\n\n<li>Copper weight<\/li>\n\n\n\n<li>Dielectric spacing<\/li>\n\n\n\n<li>Finished PCB thickness<\/li>\n\n\n\n<li>Reference planes<\/li>\n\n\n\n<li>Controlled-impedance targets<\/li>\n<\/ul>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">For example:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>FR4 TG150<br>1.6 mm finished thickness<br>1 oz copper<\/p>\n<\/blockquote>\n\n\n\n<p>still does not fully define a multilayer impedance-controlled board.<\/p>\n\n\n\n<p>Two PCBs can use the same TG150 laminate class but have very different electrical and mechanical behavior because their layer constructions differ.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">A useful rule is:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Material specification defines acceptable laminate performance; stackup specification defines PCB construction.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>Both may be needed on the same project.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Should_TG150_Material_Substitution_Be_Controlled\"><\/span>How Should TG150 Material Substitution Be Controlled?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Define the substitution rule before production. Avoid a vague \u201cor equivalent\u201d note when material properties affect the design.<\/p>\n\n\n\n<p><strong>Flexible sourcing<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Approved equivalent TG150 FR4 permitted if all controlled properties are met.<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Controlled impedance<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Equivalent material requires approval if it changes the approved impedance stackup.<\/p>\n<\/blockquote>\n\n\n\n<p><strong>Locked material<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>No material substitution without written customer approval.<\/p>\n<\/blockquote>\n\n\n\n<p>The correct rule depends on qualification risk.<\/p>\n\n\n\n<p>A standard 2-layer control PCB may benefit from flexible sourcing. A validated multilayer medical, automotive, or high-reliability design may need much tighter material control.<\/p>\n\n\n\n<p>The important point is to decide <strong>what makes an equivalent material acceptable<\/strong> before the factory substitutes it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Should_a_TG150_FR4_PCB_Material_Specification_Include\"><\/span>What Should a TG150 FR4 PCB Material Specification Include?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A practical <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/tg150-fr4-pcb-material-specification\/\" title=\"\">TG150 FR4 PCB material specification<\/a> does not need to be long.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Requirement<\/th><th class=\"has-text-align-center\" data-align=\"center\">Typical callout<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Base material<\/td><td class=\"has-text-align-center\" data-align=\"center\">FR4<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Tg<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u2265150\u00b0C<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Tg basis<\/td><td class=\"has-text-align-center\" data-align=\"center\">Datasheet, DSC, or TMA when required<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Laminate<\/td><td class=\"has-text-align-center\" data-align=\"center\">Exact material or approved equivalent<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Thermal limits<\/td><td class=\"has-text-align-center\" data-align=\"center\">Td \/ CTE \/ T260 \/ T288 when required<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Electrical<\/td><td class=\"has-text-align-center\" data-align=\"center\">Dk\/Df or controlled impedance requirements<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Assembly<\/td><td class=\"has-text-align-center\" data-align=\"center\">Lead-free compatible if required<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Substitution<\/td><td class=\"has-text-align-center\" data-align=\"center\">Allowed, restricted, or approval required<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">For a routine PCB, this may be sufficient:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Base material: FR4, Tg \u2265150\u00b0C, lead-free compatible, approved equivalent permitted.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">A more controlled multilayer design could use:<\/mark><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Base material: FR4, Tg \u2265150\u00b0C per approved laminate datasheet. Final laminate must meet the specified thermal and impedance requirements. Any substitution affecting the approved stackup requires customer approval.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>The second specification controls more without unnecessarily dictating every laminate property.<\/p>\n\n\n\n<p>The best material note is not the longest one. It is the one that clearly controls the properties that affect the finished PCB.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-1.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-1-1024x683.jpg\" alt=\"tg150 fr4 pcb material specification\" class=\"wp-image-33211\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-1-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-1-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-1-768x512.jpg 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/08\/tg150-fr4-pcb-material-specification-1.jpg 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Files_Should_Be_Sent_With_the_TG150_Requirement\"><\/span>What Files Should Be Sent With the TG150 Requirement?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Do not send the TG150 requirement as an isolated email note. Include it in the released manufacturing package.<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">A typical package includes:<\/mark><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gerber or ODB++<\/li>\n\n\n\n<li>Fabrication drawing<\/li>\n\n\n\n<li>PCB stackup<\/li>\n\n\n\n<li>Impedance table, if applicable<\/li>\n\n\n\n<li>Drill files<\/li>\n\n\n\n<li>Approved material list, when required<\/li>\n<\/ul>\n\n\n\n<p>The fabrication drawing should remain the primary source for material requirements.<\/p>\n\n\n\n<p>Avoid situations where the Gerber package says one thing, the purchase order says another, and a material restriction exists only in an old email thread.<\/p>\n\n\n\n<p>A controlled drawing makes quotation, DFM review, material purchasing, and production much easier to manage.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs_About_TG150_FR4_PCB_Material_Specification\"><\/span>FAQs About TG150 FR4 PCB Material Specification<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>What is TG150 material?<\/strong><\/p>\n\n\n\n<p>TG150 material generally refers to an FR4 laminate with a glass transition temperature around the 150\u00b0C class. Tg represents one thermal-mechanical property rather than the complete performance of the laminate.<\/p>\n\n\n\n<p><strong>Is TG150 the same as FR4?<\/strong><\/p>\n\n\n\n<p>No. FR4 is a broad family of flame-retardant glass-reinforced epoxy laminates. TG150 describes a Tg class within the FR4 material family.<\/p>\n\n\n\n<p><strong>What should I check in an FR4 TG150 datasheet?<\/strong><\/p>\n\n\n\n<p>Check the properties relevant to your PCB, typically Tg, Td, Z-axis CTE, T260\/T288, Dk, Df, and moisture absorption. Not every project needs every parameter controlled.<\/p>\n\n\n\n<p><strong>Is a TG150 PCB suitable for lead-free assembly?<\/strong><\/p>\n\n\n\n<p>Many TG150 materials are suitable for lead-free assembly. For thick boards, multiple reflow cycles, heavy copper, or higher-reliability products, review the actual laminate&#8217;s thermal properties rather than relying on Tg alone.<\/p>\n\n\n\n<p><strong>Can a PCB manufacturer substitute another TG150 material?<\/strong><\/p>\n\n\n\n<p>Yes, if the fabrication specification allows an approved equivalent. For impedance-controlled or qualified products, the substitute should meet all controlled properties and may require customer approval.<\/p>\n\n\n\n<p>Need help reviewing a <a href=\"https:\/\/www.bestpcbs.com\/blog\/2020\/06\/what-is-high-tg-pcb-fr4-170tg-tg-130-140-fr4-tg150\/\" title=\"\">TG150 FR4 PCB<\/a> material specification before fabrication? Send your Gerber files, fabrication drawing, stackup, impedance requirements, and material notes to <strong>sales@bestpcbs.com<\/strong>. Our engineering team can review the material callout, laminate alternatives, stackup, substitution requirements, and manufacturability before production.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A TG150 FR4 PCB material specification should define more than \u201cFR4 Tg150.\u201d Tg describes only one property of the laminate. If the PCB depends on controlled impedance, repeated lead-free reflow, material traceability, or tighter reliability requirements, the fabrication package should also clarify critical thermal properties, electrical requirements, approved materials, stackup, and substitution rules. The objective [&hellip;]<\/p>\n","protected":false},"author":33085,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[175,174,5309],"tags":[139,7567,7568],"class_list":["post-33192","post","type-post","status-publish","format-standard","hentry","category-best-pcb","category-bestpcb","category-pcb-material","tag-fr4-tg150","tag-tg150-fr4-pcb-material-specification","tag-tg150-material"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"TG150 FR4 PCB material specification guide covering datasheet checks, Tg test methods, Dk, stackup, lead-free reflow, and material substitution.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"zeng, liuyan\"\/>\n\t<link rel=\"canonical\" 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