{"id":30575,"date":"2026-07-14T09:47:31","date_gmt":"2026-07-14T01:47:31","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/?p=30575"},"modified":"2026-07-14T09:47:34","modified_gmt":"2026-07-14T01:47:34","slug":"isola-mt40","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/07\/isola-mt40\/","title":{"rendered":"Isola MT40 PCB Material Guide: Properties,Thickness and Stackup"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 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\/07\/isola-mt40\/#What_Is_Isola_MT40_PCB_Material\" >What Is Isola MT40 PCB Material?<\/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\/07\/isola-mt40\/#Why_Is_Isola_I-Tera_MT40_Used_for_High-Speed_PCB_Designs\" >Why Is Isola I-Tera MT40 Used for High-Speed PCB Designs?<\/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\/07\/isola-mt40\/#Isola_MT40_Material_Properties_Datasheet_Overview\" >Isola MT40 Material Properties &amp; Datasheet Overview<\/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\/07\/isola-mt40\/#What_Are_the_Dielectric_Constant_and_Dissipation_Factor_of_Isola_MT40\" >What Are the Dielectric Constant and Dissipation Factor of Isola MT40?<\/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\/07\/isola-mt40\/#What_Are_the_CTE_Values_of_Isola_MT40\" >What Are the CTE Values of Isola MT40?<\/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\/07\/isola-mt40\/#What_Are_the_Tg_and_Td_Values_of_Isola_MT40\" >What Are the Tg and Td Values of Isola MT40?<\/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\/07\/isola-mt40\/#What_Is_the_Thermal_Conductivity_of_Isola_MT40\" >What Is the Thermal Conductivity of Isola MT40?<\/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\/07\/isola-mt40\/#What_Isola_MT40_Laminate_Thickness_Options_Are_Available\" >What Isola MT40 Laminate Thickness Options Are Available?<\/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\/07\/isola-mt40\/#What_Isola_MT40_Prepreg_Options_Are_Available\" >What Isola MT40 Prepreg Options Are Available?<\/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\/07\/isola-mt40\/#How_to_Select_Isola_MT40_Core_and_Prepreg_for_Controlled_Impedance\" >How to Select Isola MT40 Core and Prepreg for Controlled Impedance?<\/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\/07\/isola-mt40\/#How_to_Design_an_Isola_MT40_PCB_Stackup\" >How to Design an Isola MT40 PCB Stackup?<\/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\/07\/isola-mt40\/#How_Does_Isola_MT40_Compare_with_Other_Low-Loss_PCB_Materials\" >How Does Isola MT40 Compare with Other Low-Loss PCB Materials?<\/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\/07\/isola-mt40\/#What_Applications_Commonly_Use_Isola_MT40_PCB_Material\" >What Applications Commonly Use Isola MT40 PCB Material?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/07\/isola-mt40\/#FAQs_About_Isola_MT40_PCB_Material\" >FAQs About Isola MT40 PCB Material<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div>\n<p><strong><a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/07\/isola-mt40\/\" title=\"\">Isola MT40<\/a><\/strong> is a <strong>very low-loss laminate and prepreg material for high-speed digital and RF\/microwave PCB designs<\/strong>. Its typical <strong>Dk of 3.45, Df of 0.0031 and DSC Tg of 215\u00b0C<\/strong> support controlled impedance, long signal channels and complex multilayer PCB structures.<\/p>\n\n\n\n<p>Material selection cannot stop at the headline values in an Isola MT40 datasheet. Laminate thickness, prepreg construction, copper profile and finished dielectric spacing all affect channel loss and impedance. A reliable high-speed PCB design starts by matching the material system to the complete stackup.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"679\" height=\"500\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40.jpg\" alt=\"Isola MT40, https:\/\/www.bestpcbs.com\/blog\/2026\/07\/isola-mt40\/\" class=\"wp-image-30605\" style=\"aspect-ratio:3\/2;object-fit:contain;width:800px\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40.jpg 679w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-300x221.jpg 300w\" sizes=\"auto, (max-width: 679px) 100vw, 679px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_Isola_MT40_PCB_Material\"><\/span>What Is Isola MT40 PCB Material?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong><a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/07\/isola-mt40\/\" title=\"\">Isola MT40<\/a>, officially known as I-Tera MT40, is a glass-reinforced very low-loss laminate and prepreg system for high-speed digital and RF\/microwave PCB designs.<\/strong> It combines stable electrical performance with fabrication methods compatible with established FR-4 processes.<\/p>\n\n\n\n<p>The material is available in laminate and prepreg forms for double-sided, multilayer and hybrid PCB structures. It is CAF resistant, compatible with lead-free assembly and suitable for multiple reflow and lamination cycles.<\/p>\n\n\n\n<p>Unlike many PTFE-based microwave materials, I-Tera MT40 does not require special through-hole treatments commonly associated with PTFE processing. <strong>The result is a low-loss material that fits practical multilayer PCB production without adding unnecessary fabrication complexity.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Is_Isola_I-Tera_MT40_Used_for_High-Speed_PCB_Designs\"><\/span>Why Is Isola I-Tera MT40 Used for High-Speed PCB Designs?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>High-speed channels become more sensitive to dielectric loss as frequency and transmission distance increase. <strong>Isola I-Tera MT40 has a typical Df of 0.0031, helping reduce the dielectric contribution to insertion loss in long or loss-sensitive signal paths.<\/strong><\/p>\n\n\n\n<p>Its main advantages include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Very low dielectric loss:<\/strong> Supports longer high-speed transmission channels.<\/li>\n\n\n\n<li><strong>Stable dielectric properties:<\/strong> Improves impedance and propagation-delay predictability.<\/li>\n\n\n\n<li><strong>Low moisture absorption:<\/strong> The typical value is <strong>0.1%<\/strong>.<\/li>\n\n\n\n<li><strong>Multilayer compatibility:<\/strong> Laminate and prepreg forms support complex stackups.<\/li>\n\n\n\n<li><strong>Multiple lamination capability:<\/strong> Suitable for advanced multilayer PCB structures.<\/li>\n\n\n\n<li><strong>FR-4 process compatibility:<\/strong> Avoids many special PTFE fabrication procedures.<\/li>\n<\/ul>\n\n\n\n<p>For this reason, Isola MT40 is often considered when standard FR-4 creates too much channel loss but a PTFE-based material system would add unnecessary processing complexity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Isola_MT40_Material_Properties_Datasheet_Overview\"><\/span>Isola MT40 Material Properties &amp; Datasheet Overview<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The Isola MT40 datasheet covers electrical, thermal and mechanical performance. <strong>Its main values include Dk 3.45, Df 0.0031, DSC Tg 215\u00b0C, Td 360\u00b0C and thermal conductivity of 0.61 W\/m\u00b7K.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Property<\/th><th>Typical Value<\/th><\/tr><\/thead><tbody><tr><td>Tg, DSC<\/td><td>215\u00b0C<\/td><\/tr><tr><td>Tg, DMA<\/td><td>230\u00b0C<\/td><\/tr><tr><td>Tg, TMA<\/td><td>210\u00b0C<\/td><\/tr><tr><td>Td, 5% Weight Loss<\/td><td>360\u00b0C<\/td><\/tr><tr><td>T260<\/td><td>&gt;60 min<\/td><\/tr><tr><td>T288<\/td><td>&gt;60 min<\/td><\/tr><tr><td>Z-Axis CTE, Pre-Tg<\/td><td>55 ppm\/\u00b0C<\/td><\/tr><tr><td>Z-Axis CTE, Post-Tg<\/td><td>290 ppm\/\u00b0C<\/td><\/tr><tr><td>Z-Axis Expansion, 50\u2013260\u00b0C<\/td><td>2.8%<\/td><\/tr><tr><td>X\/Y-Axis CTE, Pre-Tg<\/td><td>12 ppm\/\u00b0C<\/td><\/tr><tr><td>Thermal Conductivity<\/td><td>0.61 W\/m\u00b7K<\/td><\/tr><tr><td>Thermal Stress, Unetched<\/td><td>Pass, 10 sec @ 288\u00b0C<\/td><\/tr><tr><td>Thermal Stress, Etched<\/td><td>Pass, 10 sec @ 288\u00b0C<\/td><\/tr><tr><td>Dk @ 2\/5\/10 GHz<\/td><td>3.45<\/td><\/tr><tr><td>Df @ 2\/5\/10 GHz<\/td><td>0.0031<\/td><\/tr><tr><td>Volume Resistivity<\/td><td>1.33 \u00d7 10\u2077 M\u03a9-cm<\/td><\/tr><tr><td>Surface Resistivity<\/td><td>1.33 \u00d7 10\u2075 M\u03a9<\/td><\/tr><tr><td>Dielectric Breakdown<\/td><td>45.4 kV<\/td><\/tr><tr><td>Arc Resistance<\/td><td>139 sec<\/td><\/tr><tr><td>Electric Strength<\/td><td>45 kV\/mm (1133 V\/mil)<\/td><\/tr><tr><td>CTI<\/td><td>Class 3<\/td><\/tr><tr><td>Peel Strength, 1 oz EDC<\/td><td>1.0 N\/mm (5.7 lb\/in)<\/td><\/tr><tr><td>Flexural Strength, Length<\/td><td>490 MPa (71.0 kpsi)<\/td><\/tr><tr><td>Flexural Strength, Cross<\/td><td>400 MPa (58.0 kpsi)<\/td><\/tr><tr><td>Tensile Strength, Length<\/td><td>269 MPa (39.0 kpsi)<\/td><\/tr><tr><td>Tensile Strength, Cross<\/td><td>241 MPa (35.0 kpsi)<\/td><\/tr><tr><td>Young&#8217;s Modulus, Length<\/td><td>3060 ksi<\/td><\/tr><tr><td>Young&#8217;s Modulus, Cross<\/td><td>2784 ksi<\/td><\/tr><tr><td>Poisson&#8217;s Ratio, Length<\/td><td>0.234<\/td><\/tr><tr><td>Poisson&#8217;s Ratio, Cross<\/td><td>0.222<\/td><\/tr><tr><td>Moisture Absorption<\/td><td>0.1%<\/td><\/tr><tr><td>Flammability<\/td><td>V-0<\/td><\/tr><tr><td>RTI<\/td><td>130\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>These figures are typical material values rather than guaranteed finished PCB results. <strong>High-speed PCB modeling must also account for the actual dielectric construction, copper profile, finished thickness and transmission-line geometry.<\/strong> Below is a Isola MT40 datasheet pdf for your reference:<\/p>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-db0f8101-ade2-46b4-b7a7-292972bb3ace\" href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-Datasheet.pdf\">Isola MT40 Datasheet<\/a><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-Datasheet.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-db0f8101-ade2-46b4-b7a7-292972bb3ace\">Download<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_the_Dielectric_Constant_and_Dissipation_Factor_of_Isola_MT40\"><\/span>What Are the Dielectric Constant and Dissipation Factor of Isola MT40?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>The typical Isola MT40 dielectric constant is 3.45 at 2, 5 and 10 GHz. Its typical dissipation factor is 0.0031 at the same listed frequencies.<\/strong> Dk affects signal velocity and impedance, while Df indicates dielectric signal loss.<\/p>\n\n\n\n<p>Low Df becomes increasingly important as channel frequency and routing length rise. Stable Dk behavior also makes transmission-line geometry and electrical delay easier to predict during PCB design.<\/p>\n\n\n\n<p>In a production stackup, nominal datasheet data is only the starting point. <strong>Finished copper thickness, dielectric spacing and the selected construction must be included in the impedance model before trace widths and differential spacing are released.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_the_CTE_Values_of_Isola_MT40\"><\/span>What Are the CTE Values of Isola MT40?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>Isola MT40 has a typical Z-axis CTE of 55 ppm\/\u00b0C below Tg and 290 ppm\/\u00b0C above Tg. The X\/Y-axis CTE below Tg is 12 ppm\/\u00b0C, while total Z-axis expansion from 50\u00b0C to 260\u00b0C is 2.8%.<\/strong><\/p>\n\n\n\n<p>CTE matters because copper and dielectric materials expand at different rates during lamination, reflow and thermal cycling. Excessive Z-axis movement can increase mechanical stress inside plated through-hole barrels.<\/p>\n\n\n\n<p>These values reduce material-related expansion concerns, but via aspect ratio, plating thickness and repeated reflow cycles still influence plated-hole reliability. <strong>Review CTE alongside the complete PCB construction rather than treating it as an isolated material value.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_the_Tg_and_Td_Values_of_Isola_MT40\"><\/span>What Are the Tg and Td Values of Isola MT40?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>Isola MT40 has a Tg of 215\u00b0C by DSC, 230\u00b0C by DMA and 210\u00b0C by TMA. Its Td is 360\u00b0C at 5% weight loss.<\/strong><\/p>\n\n\n\n<p>Tg describes the temperature region where the resin system changes from a rigid glass-like condition to a more flexible state. Once the material moves above Tg, Z-axis expansion increases and can place more stress on multilayer PCB structures.<\/p>\n\n\n\n<p>Td describes thermal decomposition and should not be confused with Tg. The datasheet also lists <strong>T260 and T288 values above 60 minutes<\/strong> and passing thermal stress results at <strong>288\u00b0C for 10 seconds<\/strong>.<\/p>\n\n\n\n<p><strong>Together, these values show strong thermal performance for demanding lead-free assembly cycles when the reflow process is properly controlled.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_the_Thermal_Conductivity_of_Isola_MT40\"><\/span>What Is the Thermal Conductivity of Isola MT40?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>The typical thermal conductivity of Isola MT40 is 0.61 W\/m\u00b7K.<\/strong> This value describes heat transfer through the dielectric, but <strong>I-Tera MT40 is designed primarily as a very low-loss signal material rather than a dedicated thermal management laminate.<\/strong><\/p>\n\n\n\n<p>High-speed processors, FPGAs, RF devices and power circuits can still create concentrated hot spots. <strong>The PCB must provide additional heat-spreading and heat-removal paths instead of relying on laminate thermal conductivity alone.<\/strong><\/p>\n\n\n\n<p>Common thermal design methods include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Solid copper planes<\/strong> to spread heat across a larger PCB area.<\/li>\n\n\n\n<li><strong>Thermal via arrays<\/strong> to transfer heat between copper layers.<\/li>\n\n\n\n<li><strong>Large thermal pads<\/strong> beneath high-power packages.<\/li>\n\n\n\n<li><strong>Adequate copper weight<\/strong> for current and heat distribution.<\/li>\n\n\n\n<li><strong>Heatsink contact areas<\/strong> for high-power ICs and modules.<\/li>\n\n\n\n<li><strong>Chassis conduction paths<\/strong> to transfer heat into the enclosure.<\/li>\n\n\n\n<li><strong>Controlled airflow<\/strong> for assemblies with continuous high thermal loads.<\/li>\n<\/ul>\n\n\n\n<p><strong>Copper distribution, thermal vias and the mechanical cooling path often have a greater effect on finished PCB temperature than the laminate thermal conductivity value alone.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Isola_MT40_Laminate_Thickness_Options_Are_Available\"><\/span>What Isola MT40 Laminate Thickness Options Are Available?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>The standard Isola MT40 laminate offering covers 2 to 24 mil, equivalent to approximately 0.05 to 0.61 mm.<\/strong> This is the standard laminate thickness range listed for I-Tera MT40.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Option<\/th><th>Availability<\/th><\/tr><\/thead><tbody><tr><td>Laminate Thickness<\/td><td>2\u201324 mil \/ 0.05\u20130.61 mm<\/td><\/tr><tr><td>Copper Weight<\/td><td>1\/2, 1 and 2 oz<\/td><\/tr><tr><td>Copper Foil<\/td><td>HVLP, RTF, embedded resistor foil<\/td><\/tr><tr><td>Thinner Copper<\/td><td>Available<\/td><\/tr><tr><td>Heavier Copper<\/td><td>Available<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Standard published copper weights include <strong>1\/2 oz, 1 oz and 2 oz, approximately 18, 35 and 70 \u00b5m<\/strong>. Thinner and heavier copper foil options are also listed as available.<\/p>\n\n\n\n<p>Thin dielectric structures can provide tighter signal-to-reference-plane coupling, while thicker laminate may help build overall PCB thickness. <strong>Confirm the available construction before freezing the production stackup, especially when impedance depends on a narrow dielectric spacing tolerance.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Isola_MT40_Prepreg_Options_Are_Available\"><\/span>What Isola MT40 Prepreg Options Are Available?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Isola MT40 is available in prepreg form for multilayer PCB lamination. <strong>The current datasheet identifies prepreg panel tooling, moisture barrier packaging and available glass fabric categories rather than publishing a fixed construction table with resin content and pressed thickness.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Prepreg Item<\/th><th>Availability<\/th><\/tr><\/thead><tbody><tr><td>Material Form<\/td><td>Prepreg<\/td><\/tr><tr><td>Panel Tooling<\/td><td>Available<\/td><\/tr><tr><td>Packaging<\/td><td>Moisture barrier packaging<\/td><\/tr><tr><td>Glass Fabric<\/td><td>E-glass<\/td><\/tr><tr><td>Fabric Styles<\/td><td>Square weave; mechanically spread glass<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The exact Isola MT40 prepreg construction needs to match the PCB stackup. Resin content, glass fabric and pressed dielectric spacing can affect resin filling and controlled impedance.<\/p>\n\n\n\n<p>In practice, do not copy prepreg thickness from another material family or substitute a construction because the nominal thickness looks similar. <strong>Confirm the available I-Tera MT40 prepreg before the impedance geometry is finalized.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Select_Isola_MT40_Core_and_Prepreg_for_Controlled_Impedance\"><\/span>How to Select Isola MT40 Core and Prepreg for Controlled Impedance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Controlled impedance depends on <strong>dielectric spacing, Dk, trace geometry, copper thickness and the reference-plane structure<\/strong>. The exact Isola MT40 core and prepreg arrangement should be fixed before final routing dimensions are released.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Start with the impedance target.<\/strong> Define 50 \u03a9 single-ended, 90 \u03a9 differential, 100 \u03a9 differential or another required value for each controlled signal group.<\/li>\n\n\n\n<li><strong>Assign the reference plane first.<\/strong> Keep high-speed signals next to a continuous ground or suitable power plane. Avoid plane splits beneath critical channels.<\/li>\n\n\n\n<li><strong>Confirm the dielectric spacing.<\/strong> Use the actual core or pressed prepreg thickness planned for production. A small spacing change can shift impedance even when the material grade remains unchanged.<\/li>\n\n\n\n<li><strong>Use the correct dielectric data.<\/strong> The nominal Isola MT40 Dk is a useful reference, but the production construction and modeling method must match the finished PCB stackup.<\/li>\n\n\n\n<li><strong>Include finished copper thickness.<\/strong> Outer-layer plating changes the final trace cross-section and can affect impedance. Do not calculate geometry from base copper alone.<\/li>\n\n\n\n<li><strong>Review the copper profile.<\/strong> HVLP copper can help reduce conductor loss in high-frequency channels where copper surface roughness becomes significant.<\/li>\n\n\n\n<li><strong>Check resin filling around dense copper.<\/strong> Large copper-density differences can affect pressed dielectric geometry and create local stackup variation.<\/li>\n\n\n\n<li><strong>Calculate with a field solver.<\/strong> Model microstrip, stripline and differential structures using actual production values rather than a generic online calculator.<\/li>\n\n\n\n<li><strong>Verify the finished PCB.<\/strong> Use impedance coupons and compare measured results with the approved tolerance before volume production.<\/li>\n<\/ul>\n\n\n\n<p><strong>In practical stackup review, dielectric spacing is one of the first values to freeze. Changing the prepreg or core geometry after routing is complete may require the controlled traces to be recalculated.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Design_an_Isola_MT40_PCB_Stackup\"><\/span>How to Design an Isola MT40 PCB Stackup?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>A good Isola MT40 PCB stackup keeps <strong>loss-sensitive signals close to continuous reference planes, controls dielectric geometry and maintains a balanced multilayer structure<\/strong>. Layer functions should be assigned before the exact core and prepreg arrangement is finalized.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Identify critical signal channels.<\/strong> Place PCIe, Ethernet, SerDes and other loss-sensitive interfaces on layers with short, predictable return-current paths.<\/li>\n\n\n\n<li><strong>Place ground planes beside high-speed layers.<\/strong> Closely coupled signal and ground layers improve return-path control and help reduce electromagnetic interference.<\/li>\n\n\n\n<li><strong>Separate high-speed signals from noisy power sections.<\/strong> Keep switching regulators and high-current return paths away from sensitive channel routing where possible.<\/li>\n\n\n\n<li><strong>Select dielectric spacing for impedance.<\/strong> Choose core and prepreg geometry based on target impedance, trace width and manufacturable spacing.<\/li>\n\n\n\n<li><strong>Use low-profile copper where channel loss matters.<\/strong> Copper roughness contributes to conductor loss, especially as operating frequency increases.<\/li>\n\n\n\n<li><strong>Control reference-plane transitions.<\/strong> Add suitable ground return vias near signal-layer transitions so return current does not take a long detour.<\/li>\n\n\n\n<li><strong>Review via stubs on long channels.<\/strong> Back drilling or an alternative via structure may be useful when via stub resonance affects the channel-loss budget.<\/li>\n\n\n\n<li><strong>Keep the stackup mechanically balanced.<\/strong> Review dielectric distribution, copper density and plane placement on both sides of the PCB centerline.<\/li>\n\n\n\n<li><strong>Check resin fill and copper balance.<\/strong> Thin dielectric layers are not automatically better. Dense copper patterns and large copper-free areas can create lamination and thickness-control challenges.<\/li>\n\n\n\n<li><strong>Freeze the stackup before final routing release.<\/strong> Confirm the material construction, finished copper and impedance model before production data is approved.<\/li>\n<\/ul>\n\n\n\n<p>For example, an 8-layer high-speed PCB may use:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Layer<\/th><th>Function<\/th><\/tr><\/thead><tbody><tr><td>L1<\/td><td>Signal<\/td><\/tr><tr><td>L2<\/td><td>Ground<\/td><\/tr><tr><td>L3<\/td><td>High-Speed Signal<\/td><\/tr><tr><td>L4<\/td><td>Power<\/td><\/tr><tr><td>L5<\/td><td>Ground<\/td><\/tr><tr><td>L6<\/td><td>High-Speed Signal<\/td><\/tr><tr><td>L7<\/td><td>Ground<\/td><\/tr><tr><td>L8<\/td><td>Signal<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>This is a functional layer example, not a universal Isola MT40 stackup. The final dielectric thickness and trace geometry must be calculated for the actual impedance and channel-loss requirements.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-PCB-Stackup.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"656\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-PCB-Stackup-1024x656.png\" alt=\"Isola MT40 PCB Stackup, https:\/\/www.bestpcbs.com\/blog\/2026\/07\/isola-mt40\/\" class=\"wp-image-30618\" style=\"aspect-ratio:3\/2;object-fit:contain;width:800px\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-PCB-Stackup-1024x656.png 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-PCB-Stackup-300x192.png 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-PCB-Stackup-768x492.png 768w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-PCB-Stackup.png 1029w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_Isola_MT40_Compare_with_Other_Low-Loss_PCB_Materials\"><\/span>How Does Isola MT40 Compare with Other Low-Loss PCB Materials?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>Isola MT40 sits between conventional high-speed FR-4 systems and more specialized ultra-low-loss or RF-focused materials.<\/strong> Material selection should follow the channel-loss target, operating frequency, stackup complexity and fabrication requirements rather than Dk alone.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Material<\/th><th>Dk<\/th><th>Df<\/th><th>Main Position<\/th><th>Best Fit<\/th><\/tr><\/thead><tbody><tr><td>Isola MT40<\/td><td>3.45<\/td><td>0.0031<\/td><td>Very low loss<\/td><td>High-speed digital, mixed RF\/HSD multilayer PCB<\/td><\/tr><tr><td>Tachyon 100G<\/td><td>3.02<\/td><td>0.0021<\/td><td>Ultra-low loss<\/td><td>Very high-speed digital and long channels<\/td><\/tr><tr><td>Astra MT77<\/td><td>3.00<\/td><td>0.0017<\/td><td>Ultra-low-loss RF\/MW<\/td><td>RF, microwave and mmWave circuits<\/td><\/tr><tr><td>Rogers RO4350B<\/td><td>3.48 \u00b1 0.05<\/td><td>0.0037 @ 10 GHz<\/td><td>High-frequency RF<\/td><td>RF amplifiers and microwave circuits<\/td><\/tr><tr><td>MEGTRON 6 R-5775(N)<\/td><td>3.34 @ 13 GHz<\/td><td>0.0037 @ 13 GHz<\/td><td>Ultra-low-loss multilayer<\/td><td>Networking and high-layer-count ICT PCB<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The published electrical values are not always measured with identical methods or frequencies. <strong>This table is best used to understand material positioning rather than as a direct loss ranking.<\/strong><\/p>\n\n\n\n<p><strong>Choose Isola MT40 when very low loss, laminate-and-prepreg availability and practical multilayer PCB processing are all important.<\/strong> Tachyon 100G may suit a tighter digital channel-loss budget, while Astra MT77 and RO4350B are more strongly aligned with dedicated RF or microwave designs.<\/p>\n\n\n\n<p>MEGTRON 6 is commonly positioned for high-speed multilayer infrastructure hardware. <strong>The final material decision should be based on channel modeling, stackup construction and production requirements rather than one Dk or Df value.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Applications_Commonly_Use_Isola_MT40_PCB_Material\"><\/span>What Applications Commonly Use Isola MT40 PCB Material?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Isola MT40 PCB material is used where <strong>high data rates, long transmission channels or RF frequencies make dielectric loss a design concern<\/strong>. <strong>Its very low-loss electrical performance and multilayer compatibility are particularly valuable in complex high-speed PCB systems.<\/strong><\/p>\n\n\n\n<p>Typical applications include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High-speed network backplanes<\/strong><\/li>\n\n\n\n<li><strong>Switch and router line cards<\/strong><\/li>\n\n\n\n<li><strong>Server PCB assemblies<\/strong><\/li>\n\n\n\n<li><strong>Data center hardware<\/strong><\/li>\n\n\n\n<li><strong>High-speed daughter cards<\/strong><\/li>\n\n\n\n<li><strong>Computing and storage systems<\/strong><\/li>\n\n\n\n<li><strong>Communication infrastructure<\/strong><\/li>\n\n\n\n<li><strong>RF and microwave circuits<\/strong><\/li>\n\n\n\n<li><strong>Radar electronics<\/strong><\/li>\n\n\n\n<li><strong>Aerospace electronic systems<\/strong><\/li>\n\n\n\n<li><strong>Defense communication equipment<\/strong><\/li>\n\n\n\n<li><strong>Automotive communication systems<\/strong><\/li>\n\n\n\n<li><strong>Medical electronic equipment<\/strong><\/li>\n\n\n\n<li><strong>Industrial instrumentation<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>Isola MT40 is most valuable in high-speed digital, communication and mixed-signal PCB designs where conventional FR-4 creates excessive channel loss but the project still benefits from a glass-reinforced multilayer material system.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-Applications.png\"><img loading=\"lazy\" decoding=\"async\" width=\"840\" height=\"573\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-Applications.png\" alt=\"Isola MT40 Applications, https:\/\/www.bestpcbs.com\/blog\/2026\/07\/isola-mt40\/\" class=\"wp-image-30615\" style=\"aspect-ratio:3\/2;object-fit:contain;width:800px\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-Applications.png 840w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-Applications-300x205.png 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/07\/Isola-MT40-Applications-768x524.png 768w\" sizes=\"auto, (max-width: 840px) 100vw, 840px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs_About_Isola_MT40_PCB_Material\"><\/span>FAQs About Isola MT40 PCB Material<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>Q1: Is Isola MT40 RoHS compliant?<\/strong><\/p>\n\n\n\n<p><strong>A1:<\/strong> <strong>Yes. I-Tera MT40 is identified as RoHS compliant.<\/strong> Final PCBA compliance still depends on the surface finish, solder, electronic components and all other materials used in the completed assembly.<\/p>\n\n\n\n<p><strong>Q2: Is Isola MT40 UL recognized?<\/strong><\/p>\n\n\n\n<p><strong>A2:<\/strong> <strong>Yes. The product data lists UL File Number E41625. <\/strong>I-Tera MT40 laminate and laminated prepreg also have a <strong>UL 94 V-0 rating<\/strong> and a relative thermal index of <strong>130\u00b0C<\/strong>.<\/p>\n\n\n\n<p><strong>Q3: Is Isola MT40 resistant to CAF failure?<\/strong><\/p>\n\n\n\n<p><strong>A3:<\/strong> <strong>Yes. Isola lists I-Tera MT40 as CAF resistant.<\/strong> Final CAF reliability also depends on conductor spacing, hole spacing, contamination, moisture exposure and the quality of the PCB fabrication process.<\/p>\n\n\n\n<p><strong>Q4: Can Isola MT40 handle multiple PCB reflow cycles?<\/strong><\/p>\n\n\n\n<p><strong>A4: Yes. The material is identified as multiple reflow capable and lead-free assembly compatible.<\/strong> Its published T260 and T288 values are both <strong>greater than 60 minutes<\/strong>, although component temperature limits still affect the final PCBA profile.<\/p>\n\n\n\n<p><strong>Q5: Can Isola MT40 support multiple lamination cycles?<\/strong><\/p>\n\n\n\n<p><strong>A5: Yes. Multiple lamination cycles are listed among the material&#8217;s processing advantages. <\/strong>Advanced multilayer builds still need controlled registration, dielectric geometry and thermal exposure through each press cycle.<\/p>\n\n\n\n<p><strong>Q6: Does Isola MT40 require PTFE-style through-hole treatment?<\/strong><\/p>\n\n\n\n<p><strong>A6:<\/strong> <strong>No. I-Tera MT40 does not require the special through-hole treatments commonly used for PTFE-based laminates.<\/strong> <strong>FR-4-compatible PCB processes can be used<\/strong>, although drilling and hole preparation still require controlled parameters.<\/p>\n\n\n\n<p><strong>Q7: What copper foil types are available for Isola MT40?<\/strong><\/p>\n\n\n\n<p><strong>A7:<\/strong> <strong>Published options include HVLP, RTF and embedded resistor foil. <\/strong>The listed HVLP option has an Rz JIS value of <strong>\u22642.5 \u00b5m<\/strong>, which is relevant when conductor loss contributes to the channel-loss budget.<\/p>\n\n\n\n<p><strong>Q8: What standard copper weights are listed for Isola MT40?<\/strong><\/p>\n\n\n\n<p><strong>A8:<\/strong> <strong>Standard copper weights include 1\/2 oz, 1 oz and 2 oz, approximately 18, 35 and 70 \u00b5m. <\/strong>The product data also states that thinner and heavier copper foil options are available.<\/p>\n\n\n\n<p><strong>Q9: How much moisture does Isola MT40 absorb?<\/strong><\/p>\n\n\n\n<p><strong>A9: The typical published moisture absorption is 0.1%. <\/strong>This supports stable material performance, but prepreg and finished PCB materials still require controlled storage and handling during manufacturing and assembly.<\/p>\n\n\n\n<p><strong>Q10: Can Isola MT40 be used in a hybrid multilayer PCB?<\/strong><\/p>\n\n\n\n<p><strong>A10:<\/strong> <strong>Yes. I-Tera MT40 is suitable for hybrid printed circuit designs. <\/strong>Before combining material systems, compare <strong>CTE, dielectric properties, resin behavior and lamination compatibility<\/strong> to reduce bonding, warpage and impedance risks.<\/p>\n\n\n\n<p><strong>Q11: How should Isola MT40 be specified on a PCB drawing?<\/strong><\/p>\n\n\n\n<p><strong>A11:<\/strong> <strong>Clearly identify Isola I-Tera MT40 and state whether unapproved material substitution is prohibited. <\/strong>The fabrication drawing should also define finished thickness, copper weight, impedance requirements and any traceability or test-document requirements.<\/p>\n\n\n\n<p><strong>Q12: Can Isola MT40 use embedded resistor foil?<\/strong><\/p>\n\n\n\n<p><strong>A12:<\/strong> <strong>Yes.<\/strong> <strong>Embedded resistor foil is listed as an available copper foil option<\/strong> for I-Tera MT40. The resistor material system, target resistance and PCB fabrication process still need to be reviewed for the actual embedded passive design.<\/p>\n\n\n\n<p><strong>Q13: Does low moisture absorption remove the need for material storage control?<\/strong><\/p>\n\n\n\n<p><strong>A13:<\/strong> <strong>No. A typical moisture absorption of 0.1% does not eliminate storage requirements. <\/strong>Prepreg packaging, humidity exposure and material handling can still affect lamination and assembly consistency.<\/p>\n\n\n\n<p><strong>Q14: What files are needed for an Isola MT40 PCB quotation?<\/strong><\/p>\n\n\n\n<p><strong>A14:<\/strong> Provide <strong>Gerber or ODB++, drill files, fabrication drawing, stackup, impedance table, finished thickness, copper weight, surface finish and order quantity<\/strong>. For PCBA production, also include the BOM, centroid data and assembly drawing.<\/p>\n\n\n\n<p>High-speed PCB performance depends on more than choosing a low-loss laminate. <strong>Isola MT40 must be matched with the right stackup, dielectric geometry, copper profile and controlled impedance design to deliver stable channel performance from prototype through volume production.<\/strong> Early material and stackup review can also reduce impedance failures, redesigns and avoidable production delays.<\/p>\n\n\n\n<p>Planning a <strong><a href=\"https:\/\/www.bestpcbs.com\/products\/high-speed-pcb.htm\" title=\"\">high-speed PCB<\/a>, multilayer PCB or <\/strong><a href=\"https:\/\/www.bestpcbs.com\/products\/impedance-control-pcb.html\" title=\"\"><strong>controlled impedance PCB<\/strong> <\/a>with Isola MT40? EBest Circuit supports <strong>high-speed PCB material review, stackup optimization, controlled impedance, PCB fabrication and PCBA production<\/strong> from our China manufacturing base for global supply. <strong>Send your Gerber files and high-speed PCB requirements to <a href=\"https:\/\/www.bestpcbs.com\/\" title=\"\">EBest Circuit <\/a>via <a href=\"mailto:sales@bestpcbs.com\">sales@bestpcbs.com<\/a> today for an engineering review and quotation.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Isola MT40 is a very low-loss laminate and prepreg material for high-speed digital and RF\/microwave PCB designs. Its typical Dk of 3.45, Df of 0.0031 and DSC Tg of 215\u00b0C support controlled impedance, long signal channels and complex multilayer PCB structures. Material selection cannot stop at the headline values in an Isola MT40 datasheet. Laminate [&hellip;]<\/p>\n","protected":false},"author":33247,"featured_media":0,"comment_status":"closed","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":[6750,6752,6753,6751,6754],"class_list":["post-30575","post","type-post","status-publish","format-standard","hentry","category-best-pcb","category-bestpcb","category-pcb-material","tag-isola-mt40-datasheet","tag-isola-mt40-dielectric-constant","tag-isola-mt40-material-properties","tag-isola-mt40-pcb-material","tag-isola-mt40-thermal-conductivity"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/30575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/users\/33247"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/comments?post=30575"}],"version-history":[{"count":12,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/30575\/revisions"}],"predecessor-version":[{"id":30619,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/posts\/30575\/revisions\/30619"}],"wp:attachment":[{"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/media?parent=30575"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/categories?post=30575"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bestpcbs.com\/blog\/wp-json\/wp\/v2\/tags?post=30575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}