{"id":5328,"date":"2025-12-09T01:32:43","date_gmt":"2025-12-09T01:32:43","guid":{"rendered":"https:\/\/weldomachining.com\/?page_id=5328"},"modified":"2026-11-09T08:48:46","modified_gmt":"2026-11-09T08:48:46","slug":"usinage-cnc-fr4","status":"publish","type":"page","link":"https:\/\/weldomachining.com\/fr\/cnc-machining-fr4\/","title":{"rendered":"FR4"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"5328\" class=\"elementor elementor-5328\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-942004d e-con-full e-flex e-con e-parent\" data-id=\"942004d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-86bc776 elementor-widget elementor-widget-html\" data-id=\"86bc776\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!doctype html>\n<html lang=\"en\"><head><meta charset=\"utf-8\"><meta name=\"viewport\" content=\"width=device-width,initial-scale=1\"><meta name=\"description\" content=\"Custom FR-4 CNC machining for glass-epoxy insulation plates, fixtures, spacers and precision components. Laminate selection, edge control and drawing-based inspection.\"><title>FR-4 CNC Machining Services | Weldo<\/title><style>\n    body{margin:0;background:#fff}\n    #weldo-fr4-machining-page{\n      --fr-ink:#182135;--fr-muted:#626f83;--fr-brand:#292c91;--fr-dark:#202370;\n      --fr-cyan:#2f9fc2;--fr-line:#dfe5ec;--fr-soft:#f5f7fa;--fr-sky:#edf8fd;\n      --fr-wrap:min(1180px,calc(100% - 40px));\n      color:var(--fr-ink);background:#fff;font-family:Arial,\"Helvetica Neue\",Helvetica,sans-serif!important;\n      font-size:15.5px;font-weight:400;line-height:1.62;-webkit-font-smoothing:antialiased;\n    }\n    #weldo-fr4-machining-page *,#weldo-fr4-machining-page *::before,#weldo-fr4-machining-page *::after{box-sizing:border-box}\n    #weldo-fr4-machining-page [hidden]{display:none!important}\n    #weldo-fr4-machining-page :where(h1,h2,h3,p,figure,ul,dl){margin:0}\n    #weldo-fr4-machining-page :where(h1,h2,h3,p,a,button,summary,dt,dd,li,th,td,span,strong){font-family:Arial,\"Helvetica 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#weldo-fr4-machining-page :where(a,button,summary){-webkit-tap-highlight-color:transparent}\n    #weldo-fr4-machining-page .fr-wrap{width:var(--fr-wrap);margin-inline:auto}\n    #weldo-fr4-machining-page .fr-section{padding:76px 0}\n    #weldo-fr4-machining-page .fr-soft{background:var(--fr-soft)}\n    #weldo-fr4-machining-page .fr-heading{max-width:800px;margin:0 auto 35px;text-align:center}\n    #weldo-fr4-machining-page .fr-button,#weldo-fr4-machining-page .fr-button:visited{display:inline-flex;min-height:48px;padding:12px 23px;align-items:center;justify-content:center;gap:12px;border:1px solid var(--fr-brand)!important;border-radius:8px;background:var(--fr-brand)!important;color:#fff!important;-webkit-text-fill-color:#fff!important;font-size:15px;font-weight:600;line-height:1.4;text-align:center;transition:background .2s ease,box-shadow .2s ease}\n    #weldo-fr4-machining-page .fr-button:hover,#weldo-fr4-machining-page .fr-button:focus,#weldo-fr4-machining-page 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#weldo-fr4-machining-page .fr-hero-grid{display:grid;grid-template-columns:minmax(0,.83fr) minmax(0,1.17fr);gap:56px;align-items:center}\n    #weldo-fr4-machining-page .fr-hero-media{display:flex;min-width:0;min-height:375px;padding:20px;align-items:center;justify-content:center;overflow:hidden;border:1px solid var(--fr-line);border-radius:14px;background:#fff;box-shadow:0 18px 48px rgba(24,33,53,.07)}\n    #weldo-fr4-machining-page .fr-hero-media img{width:100%;height:335px;object-fit:contain}\n    #weldo-fr4-machining-page .fr-hero-copy>p{max-width:630px}\n    #weldo-fr4-machining-page .fr-points{display:flex;margin:25px 0 29px;flex-wrap:wrap;gap:12px 22px;padding:0;list-style:none}\n    #weldo-fr4-machining-page .fr-points li{display:flex;align-items:center;gap:9px;color:#344157;font-size:15px;font-weight:600;line-height:1.4}\n    #weldo-fr4-machining-page .fr-points li::before{content:\"\u2713\";display:grid;flex:0 0 25px;width:25px;height:25px;place-items:center;border-radius:50%;background:var(--fr-sky);color:var(--fr-brand);font-size:15px;font-weight:600}\n\n    \/* 02 \u2014 Reference properties *\/\n    #weldo-fr4-machining-page .fr-properties-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr);gap:45px;align-items:center}\n    #weldo-fr4-machining-page .fr-property-values{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:25px}\n    #weldo-fr4-machining-page .fr-property{padding:18px 16px;border:1px solid #d9e4ec;border-radius:11px;background:#fff}\n    #weldo-fr4-machining-page .fr-property dt{color:#56657b;font-size:15px;line-height:1.4}\n    #weldo-fr4-machining-page .fr-property dd{margin:7px 0 0;color:var(--fr-brand);font-size:20px;font-weight:600;line-height:1.35}\n    #weldo-fr4-machining-page .fr-property dd span{display:block;margin-top:3px;color:#617188;font-size:15px;font-weight:400}\n    #weldo-fr4-machining-page 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.fr-grade-panel{display:grid;grid-template-columns:minmax(0,.73fr) minmax(0,1.27fr);gap:42px;padding:30px;border:1px solid var(--fr-line);border-radius:15px;background:#fff;align-items:center}\n    #weldo-fr4-machining-page .fr-grade-media{display:flex;min-width:0;align-items:center;justify-content:center}\n    #weldo-fr4-machining-page .fr-grade-media img{width:100%;height:290px;object-fit:contain}\n    #weldo-fr4-machining-page .fr-grade-copy{min-width:0}\n    #weldo-fr4-machining-page .fr-grade-copy h3{font-size:24px!important}\n    #weldo-fr4-machining-page .fr-grade-copy details{margin-top:20px;border-top:1px solid var(--fr-line)}\n    #weldo-fr4-machining-page .fr-grade-copy summary{position:relative;display:block;padding:16px 28px 0 0;color:var(--fr-brand)!important;font-size:15px;font-weight:600;cursor:pointer;list-style:none}\n    #weldo-fr4-machining-page summary::-webkit-details-marker{display:none}\n    #weldo-fr4-machining-page .fr-grade-copy summary::after{content:\"+\";position:absolute;right:1px;top:11px;font-size:23px;font-weight:400;line-height:1.4}\n    #weldo-fr4-machining-page .fr-grade-copy details[open] summary::after{content:\"\u2212\"}\n    #weldo-fr4-machining-page .fr-grade-copy dl{margin-top:13px}\n    #weldo-fr4-machining-page .fr-grade-copy dl>div{padding-top:12px;margin-top:12px;border-top:1px solid #edf0f4}\n    #weldo-fr4-machining-page .fr-grade-copy dt{margin-bottom:3px;color:#445166;font-size:15px;font-weight:600}\n    #weldo-fr4-machining-page .fr-grade-copy dd{margin:0;color:var(--fr-muted);font-size:15px;line-height:1.55}\n    #weldo-fr4-machining-page .fr-note{margin-top:20px;padding:17px 21px;border:1px solid #d7e7ee;border-radius:11px;background:var(--fr-sky)}\n    #weldo-fr4-machining-page .fr-note p{font-size:15px!important}\n\n    \/* 04 \u2014 Drawing-based capabilities *\/\n    #weldo-fr4-machining-page .fr-cap-grid{display:grid;grid-template-columns:minmax(0,1.12fr) 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#weldo-fr4-machining-page .fr-controls{padding:0 23px}\n    #weldo-fr4-machining-page .fr-control{display:grid;grid-template-columns:42px minmax(0,1fr);gap:14px;padding:22px 0;border-bottom:1px solid #e7ecf1}\n    #weldo-fr4-machining-page .fr-control:last-child{border-bottom:0}\n    #weldo-fr4-machining-page .fr-control h3{font-size:17px!important}\n    #weldo-fr4-machining-page .fr-control p{font-size:15px!important}\n    #weldo-fr4-machining-page .fr-icon{display:grid;width:42px;height:42px;place-items:center;border-radius:10px;background:var(--fr-sky);color:var(--fr-brand)}\n    #weldo-fr4-machining-page .fr-icon svg{width:25px;height:25px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}\n    #weldo-fr4-machining-page .fr-cap-note{margin:19px auto 0;max-width:990px;font-size:15px!important;text-align:center}\n\n    \/* 05 \u2014 Surface finishing *\/\n    #weldo-fr4-machining-page 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.fr-finish-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}\n#weldo-fr4-machining-page .fr-finish-card{display:flex;flex-direction:column;overflow:hidden;border:1px solid var(--fr-line);border-radius:14px;background:#fff;box-shadow:0 5px 18px rgba(24,33,53,.04)}\n#weldo-fr4-machining-page .fr-finish-media{display:flex;padding:12px 0;justify-content:center;align-items:flex-start;background:#fff}\n#weldo-fr4-machining-page .fr-finish-media img{width:auto!important;max-width:none!important;height:clamp(100px,14vw,170px)!important;aspect-ratio:auto;object-fit:contain}\n#weldo-fr4-machining-page .fr-finish-copy{flex:1;padding:20px;border-top:1px solid var(--fr-line)}\n@media(max-width:780px){#weldo-fr4-machining-page .fr-finish-grid{grid-template-columns:1fr 1fr}#weldo-fr4-machining-page .fr-finish-media img{height:170px!important}}\n@media(max-width:560px){#weldo-fr4-machining-page .fr-finish-grid{grid-template-columns:1fr;gap:24px}#weldo-fr4-machining-page .fr-finish-media img{height:180px!important}#weldo-fr4-machining-page .fr-finish-copy{padding:20px}}\n\n#weldo-fr4-machining-page .fr-tabs .fr-tab{flex:1 1 125px;padding:10px 12px}\n#weldo-fr4-machining-page .fr-selection-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:26px}\n#weldo-fr4-machining-page .fr-selection-item{padding-top:20px;border-top:1px solid var(--fr-line)}\n#weldo-fr4-machining-page .fr-selection-item h3{font-size:17px!important}\n#weldo-fr4-machining-page .fr-selection-item p{font-size:15px!important}\n@media(max-width:1000px){#weldo-fr4-machining-page .fr-selection-grid{grid-template-columns:1fr 1fr}}\n@media(max-width:560px){#weldo-fr4-machining-page .fr-tabs .fr-tab{flex:1 1 42%;padding:10px 7px}#weldo-fr4-machining-page .fr-selection-grid{grid-template-columns:1fr;gap:22px}}\n@media(min-width:781px){#weldo-fr4-machining-page .fr-hero-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}}\n<\/style><\/head><body><main id=\"weldo-fr4-machining-page\">\n<!-- 01 \u2014 Hero -->\n<section class=\"fr-hero\" aria-labelledby=\"fr-title\"><div class=\"fr-wrap fr-hero-grid\"><figure class=\"fr-hero-media\"><img fetchpriority=\"high\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/fr4-CNC-machining.webp\" width=\"800\" height=\"600\" alt=\"Custom CNC-machined FR4 glass-epoxy insulation part\" fetchpriority=\"high\" decoding=\"async\"><\/figure><div class=\"fr-hero-copy\"><h1 id=\"fr-title\">Custom FR-4 CNC Machining Services<\/h1><p>Custom glass-epoxy insulation plates, spacers, fixtures, and precision components made to drawing. Weldo reviews the laminate grade, thickness, electrical duty, geometry, edge condition, and inspection requirements before machining.<\/p><ul class=\"fr-points\"><li>Glass-Epoxy Laminate Options<\/li><li>Prototype to Production<\/li><li>Drawing-Based Inspection<\/li><\/ul><a class=\"fr-button\" href=\"https:\/\/weldomachining.com\/file-upload\/\">Upload Your FR-4 Part Drawing <svg viewBox=\"0 0 20 20\" aria-hidden=\"true\"><path d=\"m11.2 4.5 5.5 5.5-5.5 5.5-1.4-1.4 3.1-3.1H3.5V9h9.4L9.8 5.9z\"\/><\/svg><\/a><\/div><\/div><\/section>\n<!-- 02 \u2014 Properties -->\n<section class=\"fr-section fr-soft\" aria-labelledby=\"fr-properties-title\"><div class=\"fr-wrap\"><div class=\"fr-heading\"><h2 id=\"fr-properties-title\">Property References for Glass-Epoxy Laminate<\/h2><p>Representative room-temperature ranges for selected unclad woven-glass epoxy laminates. Resin system, glass style, direction, thickness, conditioning, and test method affect the result.<\/p><\/div><dl class=\"fr-property-values\"><div class=\"fr-property\"><dt>Density<\/dt><dd>1.80\u20132.00<span>g\/cm\u00b3<\/span><\/dd><\/div><div class=\"fr-property\"><dt>Flexural Strength<\/dt><dd>310\u2013650<span>MPa \u00b7 direction-dependent<\/span><\/dd><\/div><div class=\"fr-property\"><dt>Glass Transition<\/dt><dd>130\u2013200\u00b0C<span>DSC \u00b7 selected grades<\/span><\/dd><\/div><div class=\"fr-property\"><dt>Water Absorption<\/dt><dd>0.05\u20130.25<span>% \u00b7 method-dependent<\/span><\/dd><\/div><div class=\"fr-property\"><dt>Electric Strength<\/dt><dd>15\u201345<span>kV\/mm \u00b7 test-specific<\/span><\/dd><\/div><div class=\"fr-property\"><dt>Volume Resistivity<\/dt><dd>10\u00b9\u00b3\u201310\u00b9\u2075<span>\u03a9\u00b7cm<\/span><\/dd><\/div><\/dl><p class=\"fr-properties-note\">Use exact supplier data for design. Tg is not a continuous-use temperature, and test electric strength is not a device working-voltage rating. Confirm the relevant operating, insulation, and material acceptance requirements.<\/p><\/div><\/section>\n<!-- 03 \u2014 Capability -->\n<section class=\"fr-section\" aria-labelledby=\"fr-cap-title\"><div class=\"fr-wrap\"><div class=\"fr-heading\"><h2 id=\"fr-cap-title\">Drawing-Based FR-4 Machining Capabilities<\/h2><p>Match tooling, support, cutting strategy, and inspection to the laminate\u2019s abrasive reinforcement and layered construction.<\/p><\/div><div class=\"fr-cap-grid\"><article class=\"fr-cap-box\"><div class=\"fr-box-heading\"><h3>Machining Reference Parameters<\/h3><\/div><table class=\"fr-table\" aria-label=\"FR-4 machining references\"><tbody><tr><th scope=\"row\">Part-envelope reference<\/th><td><strong>Up to 1200 \u00d7 1000 \u00d7 100 mm*<\/strong><span>Subject to stock construction, equipment, tool access, support, and workholding.<\/span><\/td><\/tr><tr><th scope=\"row\">Dimensional references<\/th><td><strong>General \u00b10.10 mm \/ selected features \u00b10.05 mm*<\/strong><span>Review feature size, laminate direction, edge support, thickness, and inspection conditions.<\/span><\/td><\/tr><tr><th scope=\"row\">Wall or web reference<\/th><td><strong>From 1.00 mm*<\/strong><span>Depends on height, span, holes, edge distance, handling, and the required insulation function.<\/span><\/td><\/tr><tr><th scope=\"row\">Small-hole reference<\/th><td><strong>From \u00d80.80 mm*<\/strong><span>Confirm depth, tool selection, backing support, breakout allowance, and inspection access.<\/span><\/td><\/tr><tr><th scope=\"row\">Stock-thickness reference<\/th><td><strong>0.20\u2013100 mm*<\/strong><span>Availability and thickness tolerance depend on supplier grade and laminate construction.<\/span><\/td><\/tr><\/tbody><\/table><\/article><div class=\"fr-cap-support\"><figure class=\"fr-cap-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/FR4-material.webp\" width=\"800\" height=\"600\" alt=\"CNC-machined FR4 glass-epoxy parts\" loading=\"lazy\" decoding=\"async\"><\/figure><dl class=\"fr-cap-planning\"><div><dt>Laminate identity<\/dt><dd>Confirm product standard, supplier grade, thickness tolerance, glass construction, and required material records.<\/dd><\/div><div><dt>Clean edges and stable cutting<\/dt><dd>Plan suitable carbide or diamond tooling, backing support, controlled workholding, tool-wear checks, and dust extraction.<\/dd><\/div><div><dt>Finished acceptance<\/dt><dd>Define critical profiles, hole patterns, edge fray, delamination limits, cleanliness, and the inspection method.<\/dd><\/div><\/dl><\/div><\/div><p class=\"fr-cap-note\">*Planning references confirmed against the drawing. Maximum size, stock thickness, narrow webs, hole size, and tolerance are reviewed separately and should not be assumed achievable together.<\/p><\/div><\/section>\n<!-- 04 \u2014 Laminate selection -->\n<section class=\"fr-section fr-soft\" aria-labelledby=\"fr-grades-title\"><div class=\"fr-wrap\"><div class=\"fr-heading\"><h2 id=\"fr-grades-title\">Select the FR-4 Laminate for the Part<\/h2><p>Compare thermal, electrical, tracking, loss, and documentation requirements against the intended machined component.<\/p><\/div><div class=\"fr-tabs\" role=\"tablist\" aria-label=\"FR-4 laminate options\"><button class=\"fr-tab\" id=\"fr-tab-standard\" type=\"button\" role=\"tab\" aria-controls=\"fr-panel-standard\" aria-selected=\"true\" tabindex=\"0\">Standard FR-4<\/button><button class=\"fr-tab\" id=\"fr-tab-mid\" type=\"button\" role=\"tab\" aria-controls=\"fr-panel-mid\" aria-selected=\"false\" tabindex=\"-1\">Mid-Tg<\/button><button class=\"fr-tab\" id=\"fr-tab-high\" type=\"button\" role=\"tab\" aria-controls=\"fr-panel-high\" aria-selected=\"false\" tabindex=\"-1\">High-Tg<\/button><button class=\"fr-tab\" id=\"fr-tab-halogen\" type=\"button\" role=\"tab\" aria-controls=\"fr-panel-halogen\" aria-selected=\"false\" tabindex=\"-1\">Halogen-Free<\/button><button class=\"fr-tab\" id=\"fr-tab-cti\" type=\"button\" role=\"tab\" aria-controls=\"fr-panel-cti\" aria-selected=\"false\" tabindex=\"-1\">High-CTI<\/button><button class=\"fr-tab\" id=\"fr-tab-loss\" type=\"button\" role=\"tab\" aria-controls=\"fr-panel-loss\" aria-selected=\"false\" tabindex=\"-1\">Low-Loss<\/button><button class=\"fr-tab\" id=\"fr-tab-caf\" type=\"button\" role=\"tab\" aria-controls=\"fr-panel-caf\" aria-selected=\"false\" tabindex=\"-1\">CAF-Resistant<\/button><\/div><div class=\"fr-grade-panel\" id=\"fr-panel-standard\" role=\"tabpanel\" aria-labelledby=\"fr-tab-standard\" tabindex=\"0\"><figure class=\"fr-grade-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/standard-fr4-material.webp\" width=\"600\" height=\"600\" alt=\"Standard FR4 laminate material\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-grade-copy\"><h3>Standard FR-4<\/h3><p>A general-purpose woven-glass epoxy laminate offering useful stiffness and electrical insulation for a specified cost and performance target.<\/p><details><summary>Applications &amp; machining notes<\/summary><dl><div><dt>Typical parts and uses<\/dt><dd>Insulation plates, spacers, fixtures, support panels, and terminal boards.<\/dd><\/div><div><dt>Selection requirements<\/dt><dd>Operate within the documented grade rating and define voltage, humidity, thickness, and assembly requirements.<\/dd><\/div><div><dt>Finishing options<\/dt><dd>As-machined edges, controlled deburring, edge sanding, and printed identification.<\/dd><\/div><\/dl><\/details><\/div><\/div><div class=\"fr-grade-panel\" id=\"fr-panel-mid\" role=\"tabpanel\" aria-labelledby=\"fr-tab-mid\" tabindex=\"0\" hidden><figure class=\"fr-grade-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/mid-TG-fr4-material.webp\" width=\"600\" height=\"600\" alt=\"Mid-Tg FR4 laminate material\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-grade-copy\"><h3>Mid-Tg FR-4<\/h3><p>Supplier-defined formulations offering additional thermal-processing margin compared with conventional standard-Tg materials.<\/p><details><summary>Applications &amp; machining notes<\/summary><dl><div><dt>Typical parts and uses<\/dt><dd>Test plates, equipment panels, insulation supports, and assembly fixtures.<\/dd><\/div><div><dt>Selection requirements<\/dt><dd>Confirm the actual Tg, test method, expansion, thermal cycling, and long-term operating rating. Mid-Tg is a descriptive category, not a complete material specification.<\/dd><\/div><div><dt>Finishing options<\/dt><dd>As-machined edges, sanding, suitable precision grinding, and marking.<\/dd><\/div><\/dl><\/details><\/div><\/div><div class=\"fr-grade-panel\" id=\"fr-panel-high\" role=\"tabpanel\" aria-labelledby=\"fr-tab-high\" tabindex=\"0\" hidden><figure class=\"fr-grade-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/high-TG-FR4-material.webp\" width=\"600\" height=\"600\" alt=\"High-Tg FR4 laminate material\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-grade-copy\"><h3>High-Tg FR-4<\/h3><p>Formulations selected for greater thermal-process margin and specified dimensional behavior through temperature changes.<\/p><details><summary>Applications &amp; machining notes<\/summary><dl><div><dt>Typical parts and uses<\/dt><dd>Thermal fixtures, test plates, supports, and electrical panels.<\/dd><\/div><div><dt>Selection requirements<\/dt><dd>Review verified RTI or supplier operating limits, load, and exposure time. A higher Tg does not by itself establish a higher continuous-use temperature.<\/dd><\/div><div><dt>Finishing options<\/dt><dd>Precision machining, controlled grinding, edge sealing, and compatible insulating coatings where required.<\/dd><\/div><\/dl><\/details><\/div><\/div><div class=\"fr-grade-panel\" id=\"fr-panel-halogen\" role=\"tabpanel\" aria-labelledby=\"fr-tab-halogen\" tabindex=\"0\" hidden><figure class=\"fr-grade-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/halogen-free-FR4-material.webp\" width=\"600\" height=\"600\" alt=\"Halogen-free FR4 laminate material\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-grade-copy\"><h3>Halogen-Free FR-4<\/h3><p>Formulations specified for defined halogen-content requirements, with electrical, thermal, and flame properties confirmed separately.<\/p><details><summary>Applications &amp; machining notes<\/summary><dl><div><dt>Typical parts and uses<\/dt><dd>Insulation panels, fixtures, enclosures, and electrical support components.<\/dd><\/div><div><dt>Selection requirements<\/dt><dd>State the actual halogen-content specification and required supplier records. Confirm the thermal and electrical performance of the exact product.<\/dd><\/div><div><dt>Finishing options<\/dt><dd>Mechanical finishing, marking, or coating compatible with the selected laminate and project requirements.<\/dd><\/div><\/dl><\/details><\/div><\/div><div class=\"fr-grade-panel\" id=\"fr-panel-cti\" role=\"tabpanel\" aria-labelledby=\"fr-tab-cti\" tabindex=\"0\" hidden><figure class=\"fr-grade-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/high-reliability-fr4.webp\" width=\"600\" height=\"600\" alt=\"High-reliability FR4 laminate material\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-grade-copy\"><h3>High-CTI FR-4<\/h3><p>Documented grades selected for greater resistance to surface tracking under the specified test conditions.<\/p><details><summary>Applications &amp; machining notes<\/summary><dl><div><dt>Typical parts and uses<\/dt><dd>Barrier plates, terminal supports, busbar insulation, and switchgear components.<\/dd><\/div><div><dt>Selection requirements<\/dt><dd>Specify the CTI requirement and review creepage, clearance, humidity, contamination, and assembly design. CTI and bulk electric strength describe different properties.<\/dd><\/div><div><dt>Finishing options<\/dt><dd>Controlled edges, marking, edge sealing, or approved insulating coatings as specified.<\/dd><\/div><\/dl><\/details><\/div><\/div><div class=\"fr-grade-panel\" id=\"fr-panel-loss\" role=\"tabpanel\" aria-labelledby=\"fr-tab-loss\" tabindex=\"0\" hidden><figure class=\"fr-grade-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/low-loss-fr4-material.webp\" width=\"600\" height=\"600\" alt=\"Low-loss FR4 laminate material\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-grade-copy\"><h3>Low-Loss Glass-Epoxy Laminate<\/h3><p>Supplier-qualified formulations with defined dielectric constant and loss at specified frequencies for signal-related applications.<\/p><details><summary>Applications &amp; machining notes<\/summary><dl><div><dt>Typical parts and uses<\/dt><dd>Test fixtures, carrier plates, dielectric supports, and circuit tooling.<\/dd><\/div><div><dt>Selection requirements<\/dt><dd>State Dk, Df, frequency, test method, glass construction, thickness, and direction. Lower-loss performance must follow the exact laminate data.<\/dd><\/div><div><dt>Finishing options<\/dt><dd>Precision machining, edge sanding or grinding, and compatible printed identification.<\/dd><\/div><\/dl><\/details><\/div><\/div><div class=\"fr-grade-panel\" id=\"fr-panel-caf\" role=\"tabpanel\" aria-labelledby=\"fr-tab-caf\" tabindex=\"0\" hidden><figure class=\"fr-grade-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/high-reliability-fr4.webp\" width=\"600\" height=\"600\" alt=\"CAF-resistant high-reliability FR4 laminate material\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-grade-copy\"><h3>CAF-Resistant FR-4<\/h3><p>Qualified laminate systems intended to resist internal conductive-filament growth under defined humidity, bias, and conductor-spacing conditions.<\/p><details><summary>Applications &amp; machining notes<\/summary><dl><div><dt>Typical parts and uses<\/dt><dd>Primarily printed-wiring cores and dense conductor structures where CAF qualification is relevant.<\/dd><\/div><div><dt>Selection requirements<\/dt><dd>Identify the actual test or qualification requirement. CAF resistance is distinct from surface tracking and is rarely the main selection criterion for a plain machined insulation plate.<\/dd><\/div><div><dt>Finishing options<\/dt><dd>Deburring, controlled edges, specified edge sealing, and approved identification.<\/dd><\/div><\/dl><\/details><\/div><\/div><div class=\"fr-note\"><p>These material categories can overlap within one supplier product. Specify the exact laminate and required properties rather than treating the category name or material color as a complete identification.<\/p><\/div><\/div><\/section>\n<!-- 05 \u2014 DFM and application -->\n<section class=\"fr-section\" aria-labelledby=\"fr-design-title\"><div class=\"fr-wrap\"><div class=\"fr-heading\"><h2 id=\"fr-design-title\">Design for Clean Edges and Reliable Insulation<\/h2><p>FR-4 suits many rigid sheet-based insulation and support parts. Review geometry, electrical duty, thermal exposure, moisture, and assembly loads together.<\/p><\/div><div class=\"fr-selection-grid\"><article class=\"fr-selection-item\"><h3>Support the Layered Construction<\/h3><p>Use practical hole-to-edge distances, support thin sheets and cutting exits, and review narrow webs to limit breakout, fray, and delamination.<\/p><\/article><article class=\"fr-selection-item\"><h3>Define Functional Geometry<\/h3><p>Identify datums, critical hole patterns, mating faces, and accessible internal radii. Apply close tolerances where the assembly needs them.<\/p><\/article><article class=\"fr-selection-item\"><h3>Specify Electrical and Thermal Duty<\/h3><p>State voltage, temperature, humidity, flame rating, CTI, and dielectric requirements as relevant to the application and exact laminate.<\/p><\/article><article class=\"fr-selection-item\"><h3>Review Fastening and Loads<\/h3><p>Consider impact, concentrated loads, repeated assembly, and thread strength. Select suitable edge distances, through-fastenings, inserts, or other validated joint designs.<\/p><\/article><\/div><\/div><\/section>\n<!-- 06 \u2014 Projects -->\n<section class=\"fr-section fr-soft\" aria-labelledby=\"fr-projects-title\"><div class=\"fr-wrap\"><div class=\"fr-gallery-head\"><div><h2 id=\"fr-projects-title\">Weldo FR-4 Machining Projects<\/h2><p>Examples of machined glass-epoxy plates, electrical fixtures, support parts, and custom insulation components produced by Weldo.<\/p><\/div><div class=\"fr-slider-controls\"><button class=\"fr-slider-button\" type=\"button\" data-fr-track=\"fr-projects\" data-fr-direction=\"-1\" aria-controls=\"fr-projects\" aria-label=\"Previous project images\"><svg viewBox=\"0 0 20 20\" aria-hidden=\"true\"><path d=\"m8.8 4.5-5.5 5.5 5.5 5.5 1.4-1.4L7.1 11h9.4V9H7.1l3.1-3.1z\"\/><\/svg><\/button><button class=\"fr-slider-button\" type=\"button\" data-fr-track=\"fr-projects\" data-fr-direction=\"1\" aria-controls=\"fr-projects\" aria-label=\"Next project images\"><svg viewBox=\"0 0 20 20\" aria-hidden=\"true\"><path d=\"m11.2 4.5 5.5 5.5-5.5 5.5-1.4-1.4 3.1-3.1H3.5V9h9.4L9.8 5.9z\"\/><\/svg><\/button><\/div><\/div><div class=\"fr-gallery-track\" id=\"fr-projects\" role=\"region\" aria-labelledby=\"fr-projects-title\" tabindex=\"0\"><figure class=\"fr-gallery-image\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2025\/12\/FR4-green-color-resin-glass-fiber-precision-part-10.webp\" width=\"600\" height=\"600\" alt=\"CNC-machined FR4 precision plate\" loading=\"lazy\" decoding=\"async\"><\/figure><figure class=\"fr-gallery-image\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2025\/12\/fr4-green-resin-glass-fiber-parts-1.webp\" width=\"600\" height=\"600\" alt=\"Custom FR4 glass-epoxy components\" loading=\"lazy\" decoding=\"async\"><\/figure><figure class=\"fr-gallery-image\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2025\/12\/fr4.webp\" width=\"600\" height=\"600\" alt=\"Machined FR4 insulation component\" loading=\"lazy\" decoding=\"async\"><\/figure><figure class=\"fr-gallery-image\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2025\/12\/fr4-precision-parts-application.webp\" width=\"600\" height=\"600\" alt=\"FR4 precision part application\" loading=\"lazy\" decoding=\"async\"><\/figure><figure class=\"fr-gallery-image\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/elementor\/thumbs\/FR4-green-color-resin-glass-fiber-precision-part-5-rfvrio7d15jhiecq2wq3o550eh794m69s8rieycyhy.webp\" width=\"600\" height=\"600\" alt=\"FR4 electrical fixture part\" loading=\"lazy\" decoding=\"async\"><\/figure><figure class=\"fr-gallery-image\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/elementor\/thumbs\/FR4-green-color-resin-glass-fiber-precision-part-11-rfvtltevecgziikemos84ltnksmfl2ehu4a9p51qcg.webp\" width=\"600\" height=\"600\" alt=\"Machined FR4 support plate\" loading=\"lazy\" decoding=\"async\"><\/figure><figure class=\"fr-gallery-image\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2025\/12\/FR4-green-color-resin-glass-fiber-precision-part-1.webp\" width=\"600\" height=\"600\" alt=\"FR4 flange-shaped insulation part\" loading=\"lazy\" decoding=\"async\"><\/figure><\/div><\/div><\/section>\n<!-- 07 \u2014 Quality -->\n<section class=\"fr-section\" aria-labelledby=\"fr-quality-title\"><div class=\"fr-wrap\"><div class=\"fr-heading\"><h2 id=\"fr-quality-title\">From Laminate Review to Final Inspection<\/h2><p>Confirm material identity, edge quality, and critical dimensions from process planning through finished-part acceptance.<\/p><\/div><div class=\"fr-quality-grid\"><article class=\"fr-quality-card\"><figure class=\"fr-quality-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/06\/fr4-material-board.webp\" width=\"700\" height=\"500\" alt=\"CNC machining FR4 board test\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-quality-copy\"><h3>Laminate Review<\/h3><p>Confirm supplier product, thickness, glass construction, condition, and required material records.<\/p><\/div><\/article><article class=\"fr-quality-card\"><figure class=\"fr-quality-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2026\/08\/CNC-machining-center.webp\" width=\"700\" height=\"500\" alt=\"In-process dimensional inspection\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-quality-copy\"><h3>Process Control<\/h3><p>Manage abrasive tool wear, workholding, cutting support, dust extraction, and edge quality.<\/p><\/div><\/article><article class=\"fr-quality-card\"><figure class=\"fr-quality-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/elementor\/thumbs\/CMM-test-center-rnq7escpg36xs0dlapa7qoujsad0mf28g4ziqtoozs.webp\" width=\"700\" height=\"500\" alt=\"CMM dimensional inspection\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-quality-copy\"><h3>Dimensional Inspection<\/h3><p>Verify profiles, hole patterns, thickness, and critical interfaces under agreed measurement conditions.<\/p><\/div><\/article><article class=\"fr-quality-card\"><figure class=\"fr-quality-media\"><img loading=\"lazy\" src=\"https:\/\/weldomachining.com\/wp-content\/uploads\/2025\/11\/weldo-cnc-parts-package-center.webp\" width=\"700\" height=\"500\" alt=\"Pre-shipment inspection\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"fr-quality-copy\"><h3>Delivery Control<\/h3><p>Confirm required records and clean, protect, label, and pack approved parts for shipment.<\/p><\/div><\/article><\/div><div class=\"fr-note\"><p>Secondary operations can include deburring, sanding, controlled grinding, marking, edge sealing, insulating coating, bonding, and assembly. Specify compatibility, final dimensions, and any required adhesion or insulation acceptance.<\/p><a class=\"fr-link\" href=\"https:\/\/weldomachining.com\/surface-finish\/\">Explore surface finishing options \u2192<\/a><\/div><\/div><\/section>\n<!-- 08 \u2014 FAQ \/ CTA -->\n<section class=\"fr-section fr-soft\" aria-labelledby=\"fr-faq-title\"><div class=\"fr-wrap fr-final-grid\"><div><h2 id=\"fr-faq-title\">FR-4 Machining Questions<\/h2><div class=\"fr-faq\"><details open><summary>Which cutting tools suit FR-4?<\/summary><div class=\"fr-answer\"><p>Suitable carbide, diamond-coated, or PCD tools are selected according to geometry, production volume, laminate, and edge requirements. Glass reinforcement is abrasive, so tool wear and chip or dust control are part of the process plan.<\/p><\/div><\/details><details><summary>How is deformation or edge damage reduced?<\/summary><div class=\"fr-answer\"><p>Support thin sheets and tool exits, use controlled workholding, and plan suitable cutting engagement and material removal. Verify critical dimensions after release from the fixture at the agreed measurement condition.<\/p><\/div><\/details><details><summary>How is flame performance specified?<\/summary><div class=\"fr-answer\"><p>State the required rating and verify the exact manufacturer, product designation, color, and thickness against the applicable supplier recognition or test record. FR-4 naming alone is not the full certification specification.<\/p><\/div><\/details><details><summary>What is the difference between FR-4 and G10?<\/summary><div class=\"fr-answer\"><p>Both are woven-glass epoxy laminates. FR-4 is specified with flame-retardant performance, while G10 has its own structural and electrical material requirements. Review exact product data and required ratings before substitution.<\/p><\/div><\/details><details><summary>Can threads be machined into FR-4?<\/summary><div class=\"fr-answer\"><p>Direct threads require adequate laminate thickness, edge distance, and verified loading. Through-bolts, captive nuts, or compatible inserts can suit repeated assembly or higher loads. Define torque, pull-out requirements, and the joint geometry.<\/p><\/div><\/details><details><summary>Does high Tg mean a higher operating temperature?<\/summary><div class=\"fr-answer\"><p>Tg identifies a material transition under a stated test method. Long-term use depends on the exact product rating, electrical or mechanical duty, exposure time, and environment. Review supplier RTI or operating data for the actual application.<\/p><\/div><\/details><\/div><\/div><aside class=\"fr-cta\"><h2>Let's Review Your FR-4 Part<\/h2><p>Send the drawing and intended use. We will review laminate, machining, finishing, and inspection for a practical production plan and quotation.<\/p><ul class=\"fr-checks\"><li>3D model and controlled 2D drawing<\/li><li>Supplier grade, glass construction, and thickness<\/li><li>Quantity and target schedule<\/li><li>Critical profiles, hole patterns, and datums<\/li><li>Electrical, thermal, flame, and surface requirements<\/li><li>Material records and inspection acceptance<\/li><\/ul><div class=\"fr-files\" aria-label=\"Project file formats\"><span>STEP<\/span><span>IGES<\/span><span>DWG<\/span><span>DXF<\/span><span>PDF<\/span><\/div><a class=\"fr-button\" href=\"https:\/\/weldomachining.com\/file-upload\/\">Start Your FR-4 Part Review <svg viewBox=\"0 0 20 20\" aria-hidden=\"true\"><path d=\"m11.2 4.5 5.5 5.5-5.5 5.5-1.4-1.4 3.1-3.1H3.5V9h9.4L9.8 5.9z\"\/><\/svg><\/a><p class=\"fr-cta-note\">If the grade is not yet selected, include voltage, operating temperature, humidity, load, and the required material performance.<\/p><\/aside><\/div><\/section>\n<\/main><script>\n(()=>{\n const root=document.getElementById('weldo-fr4-machining-page');if(!root)return;\n const tabs=Array.from(root.querySelectorAll('[role=\"tab\"]'));\n const activate=tab=>tabs.forEach(item=>{const active=item===tab;item.setAttribute('aria-selected',String(active));item.tabIndex=active?0:-1;const panel=root.querySelector('#'+item.getAttribute('aria-controls'));if(panel)panel.hidden=!active});\n tabs.forEach((tab,index)=>{tab.addEventListener('click',()=>activate(tab));tab.addEventListener('keydown',e=>{let next;if(e.key==='ArrowRight')next=(index+1)%tabs.length;else if(e.key==='ArrowLeft')next=(index-1+tabs.length)%tabs.length;else if(e.key==='Home')next=0;else if(e.key==='End')next=tabs.length-1;else return;e.preventDefault();activate(tabs[next]);tabs[next].focus()})});\n const reduced=window.matchMedia('(prefers-reduced-motion: reduce)').matches;\n root.querySelectorAll('[data-fr-track]').forEach(button=>button.addEventListener('click',()=>{const track=root.querySelector('#'+button.dataset.frTrack);if(track)track.scrollBy({left:Number(button.dataset.frDirection)*track.clientWidth*.82,behavior:reduced?'auto':'smooth'})}));\n})();\n<\/script><\/body><\/html>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>FR-4 CNC Machining Services | Weldo Custom FR-4 CNC Machining Services Custom glass-epoxy insulation plates, spacers, fixtures, and precision components made to drawing. Weldo reviews the laminate grade, thickness, electrical duty, geometry, edge condition, and inspection requirements before machining. Glass-Epoxy Laminate Options Prototype to Production Drawing-Based Inspection Upload Your FR-4 Part Drawing Property References for [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":5336,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5328","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages\/5328","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/comments?post=5328"}],"version-history":[{"count":108,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages\/5328\/revisions"}],"predecessor-version":[{"id":15793,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/pages\/5328\/revisions\/15793"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/media\/5336"}],"wp:attachment":[{"href":"https:\/\/weldomachining.com\/fr\/wp-json\/wp\/v2\/media?parent=5328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}