{"id":38513,"date":"2026-11-06T18:25:56","date_gmt":"2026-11-06T10:25:56","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/ceramic-pcb-edge-chipping\/"},"modified":"2026-11-06T18:25:56","modified_gmt":"2026-11-06T10:25:56","slug":"ceramic-pcb-edge-chipping","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/11\/ceramic-pcb-edge-chipping\/","title":{"rendered":"Ceramic PCB Edge Chipping: What to Inspect Before Use"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 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\/11\/ceramic-pcb-edge-chipping\/#What_an_Edge_Chip_Is\" >What an Edge Chip Is<\/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\/11\/ceramic-pcb-edge-chipping\/#Chip_vs_Suspected_Crack\" >Chip vs Suspected Crack<\/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\/11\/ceramic-pcb-edge-chipping\/#Detailed_Parameters_to_Record\" >Detailed Parameters to Record<\/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\/11\/ceramic-pcb-edge-chipping\/#Use_the_Finished_Outline_as_the_Reference\" >Use the Finished Outline as the Reference<\/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\/11\/ceramic-pcb-edge-chipping\/#Worked_Example_Check_the_Gap_to_Copper\" >Worked Example: Check the Gap to Copper<\/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\/11\/ceramic-pcb-edge-chipping\/#Scribe-and-Break_vs_Full_Separation\" >Scribe-and-Break vs Full Separation<\/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\/11\/ceramic-pcb-edge-chipping\/#Check_Both_Faces_and_the_Corner\" >Check Both Faces and the Corner<\/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\/11\/ceramic-pcb-edge-chipping\/#Treat_a_Suspected_Crack_Separately\" >Treat a Suspected Crack Separately<\/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\/11\/ceramic-pcb-edge-chipping\/#Review_How_the_Part_Is_Clamped_or_Supported\" >Review How the Part Is Clamped or Supported<\/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\/11\/ceramic-pcb-edge-chipping\/#Check_Whether_the_Pattern_Repeats\" >Check Whether the Pattern Repeats<\/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\/11\/ceramic-pcb-edge-chipping\/#Put_Inspection_Criteria_on_the_Drawing\" >Put Inspection Criteria on the Drawing<\/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\/11\/ceramic-pcb-edge-chipping\/#Release_Against_Evidence_Not_Appearance_Alone\" >Release Against Evidence, Not Appearance Alone<\/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\/11\/ceramic-pcb-edge-chipping\/#Discuss_a_Ceramic_Substrate_Requirement\" >Discuss a Ceramic Substrate Requirement<\/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\/11\/ceramic-pcb-edge-chipping\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p>A small chip on a ceramic PCB is not automatically acceptable or rejectable. Its location matters: a corner chip far from copper is a different problem from damage beside a conductor or beneath a clamp. Measure the affected feature and compare it with the agreed drawing before accepting the substrate.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_an_Edge_Chip_Is\"><\/span>What an Edge Chip Is<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A chip is a local loss of material at an edge or corner. It may be visible after separation, handling or another operation. Record the first stage where it was observed, but do not assume that stage caused it.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/ceramic-edge-tiles.jpg\" width=\"1120\" height=\"630\" style=\"max-width:100%;height:auto\" alt=\"Ceramic substrates with patterned copper and visible edges\"><figcaption>AI-generated illustration of ceramic edges, not actual defect samples.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Chip_vs_Suspected_Crack\"><\/span>Chip vs Suspected Crack<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Observation<\/strong><\/td>\n<td><strong>What it may indicate<\/strong><\/td>\n<td><strong>What to do next<\/strong><\/td>\n<\/tr>\n<tr>\n<td>&#8212;<\/td>\n<td>&#8212;<\/td>\n<td>&#8212;<\/td>\n<\/tr>\n<tr>\n<td>Local missing material<\/td>\n<td>Chip<\/td>\n<td>Measure its extent and position<\/td>\n<\/tr>\n<tr>\n<td>Narrow line extending inward<\/td>\n<td>Possible crack<\/td>\n<td>Hold for appropriate examination<\/td>\n<\/tr>\n<tr>\n<td>Edge texture repeats along separation line<\/td>\n<td>Possible process texture<\/td>\n<td>Compare with the approved edge reference<\/td>\n<\/tr>\n<tr>\n<td>Copper is exposed or lifted<\/td>\n<td>Affected metallization<\/td>\n<td>Escalate the conductor condition separately<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Detailed_Parameters_to_Record\"><\/span>Detailed Parameters to Record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure class=\"wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td><strong>Parameter<\/strong><\/td>\n<td><strong>Unit or record<\/strong><\/td>\n<td><strong>Why it matters<\/strong><\/td>\n<\/tr>\n<tr>\n<td>&#8212;<\/td>\n<td>&#8212;<\/td>\n<td>&#8212;<\/td>\n<\/tr>\n<tr>\n<td>Extent along edge<\/td>\n<td>mm<\/td>\n<td>Describes the affected length<\/td>\n<\/tr>\n<tr>\n<td>Inward reach<\/td>\n<td>mm from intended edge<\/td>\n<td>Shows loss of clearance<\/td>\n<\/tr>\n<tr>\n<td>Remaining gap to copper<\/td>\n<td>mm<\/td>\n<td>Supports the drawing check<\/td>\n<\/tr>\n<tr>\n<td>Face and location<\/td>\n<td>Top, bottom, corner or edge ID<\/td>\n<td>Makes inspection reproducible<\/td>\n<\/tr>\n<tr>\n<td>Suspected crack<\/td>\n<td>Direction and visible extent<\/td>\n<td>Triggers additional examination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Use_the_Finished_Outline_as_the_Reference\"><\/span>Use the Finished Outline as the Reference<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Agree where the intended edge lies and how damage is measured relative to it. A chip\u2019s visible width along the edge and its reach inward are different quantities. Mark the measurement direction and show the nearest relevant copper in the record.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Worked_Example_Check_the_Gap_to_Copper\"><\/span>Worked Example: Check the Gap to Copper<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Suppose a conductor begins 0.45 mm from the intended outline and a local chip reaches 0.20 mm inward directly toward it. In this simple aligned example, 0.25 mm remains. If a hypothetical drawing requires 0.30 mm there, the part fails that requirement. For irregular damage, measure the actual shortest distance rather than subtracting unrelated dimensions.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Scribe-and-Break_vs_Full_Separation\"><\/span>Scribe-and-Break vs Full Separation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Scribing establishes a line for a later break. It is not the same as a process that fully separates the substrate during cutting. <a href=\"https:\/\/global.kyocera.com\/prdct\/fc\/pdf\/catalog\/electronic.pdf\">Kyocera&#8217;s ceramics catalogue<\/a> illustrates a laser scribe geometry for its substrates; the example is not a transferable acceptance limit.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Check_Both_Faces_and_the_Corner\"><\/span>Check Both Faces and the Corner<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A top view can miss damage visible on the underside or along the sidewall. Inspect the relevant faces and use adequate lighting and magnification. Keep the inspection method consistent when comparing a candidate part with the approved sample.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/11\/ceramic-edge-optics.jpg\" width=\"1120\" height=\"630\" style=\"max-width:100%;height:auto\" alt=\"Ceramic coupon on an optical inspection bench\"><figcaption>AI-generated illustration of inspection context, not a crack-detection result.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Treat_a_Suspected_Crack_Separately\"><\/span>Treat a Suspected Crack Separately<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do not classify an inward line as ordinary texture solely because the part passes continuity. The observed line may need review by the responsible quality engineer using an approved method. Preserve the sample and document its location without attempting an unapproved repair.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Review_How_the_Part_Is_Clamped_or_Supported\"><\/span>Review How the Part Is Clamped or Supported<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>If the edge sits under a clamp, in a locating pocket, or against a fixture, a small geometry change can affect contact or positioning. Compare the actual damage location with the assembly interface. A corner outside the copper field is not necessarily outside the mechanical load path.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Check_Whether_the_Pattern_Repeats\"><\/span>Check Whether the Pattern Repeats<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Record the panel position and edge direction for each finding. Repeated damage near one separation feature can guide a review of the process or handling, but does not establish a cause by itself. Keep original photos and measurements rather than retaining only a summary count.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Put_Inspection_Criteria_on_the_Drawing\"><\/span>Put Inspection Criteria on the Drawing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Specify what to measure, where exceptions are prohibited and what triggers a hold. Include the inspection stage and sample condition. For the broader substrate design context, see the <a href=\"https:\/\/www.bestpcbs.com\/products\/ceramic-substrate.htm\">BestPCBs ceramic substrate design guide<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Release_Against_Evidence_Not_Appearance_Alone\"><\/span>Release Against Evidence, Not Appearance Alone<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Compare the actual dimensions and remaining clearances with the applicable limits. Where crack status, insulation or load support is uncertain, keep that question open until the responsible reviewer has enough evidence. A photograph is useful documentation, not automatic approval.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Discuss_a_Ceramic_Substrate_Requirement\"><\/span>Discuss a Ceramic Substrate Requirement<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Share the ceramic grade, outline and critical copper edge zones with <a href=\"mailto:sales@bestpcbs.com\">Best Technology<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3>Is every chip on a ceramic board a reject?<\/h3>\n<p>No universal rule applies to all constructions and uses. Evaluate the chip against the approved drawing, its location and the function of the edge. If the acceptance criteria do not cover the finding, obtain a documented disposition rather than relying on a visual impression.<\/p>\n<h3>Does passing continuity mean the chip is harmless?<\/h3>\n<p>No. Continuity tests the electrical path under defined conditions. It does not establish remaining clearance, mechanical support or absence of cracking. Check the feature that the drawing or assembly actually depends on, and keep the electrical result separate from the mechanical disposition.<\/p>\n<h3>How do I measure a chip at a rounded corner?<\/h3>\n<p>Use the intended contour from the drawing and the agreed inspection convention for that corner. Report the extent and location with a marked image where useful. Do not force an irregular feature into a straight-edge measurement if doing so hides the actual loss of clearance.<\/p>\n<h3>Can two chips of the same size have different outcomes?<\/h3>\n<p>Yes. One may be far from any functional feature while another is beside a copper pad, seal or clamp. Record the position and remaining distance to critical features as well as size. Apply the acceptance rule that belongs to that zone of the design.<\/p>\n<h3>Is a laser scribe mark automatically a defect?<\/h3>\n<p>No. A visible separation feature can be part of an approved process. Compare it with the drawing and reference sample, and look for additional damage that is not expected for that method. If the line appears to extend into the substrate, escalate it as a separate finding.<\/p>\n<h3>Can I use a phone photo for approval?<\/h3>\n<p>A photo can show the location and appearance, but perspective and lighting can hide depth or exaggerate size. Use it as supporting evidence. When approval depends on a numerical limit or suspected crack, use the measurement or inspection method specified for the part.<\/p>\n<h3>Should I sand the damaged edge before measuring it?<\/h3>\n<p>Do not alter the part without an approved disposition. Sanding changes the profile and may remove evidence needed to identify the finding. Document the as-found condition first, then follow any repair or rejection decision made by the responsible quality and engineering owners.<\/p>\n<h3>What goes into a ceramic edge inspection report?<\/h3>\n<p>Record the part revision, lot, ceramic grade, edge or corner identifier, observed extent and remaining clearance. Include the measurement method and representative images. Note separately whether a crack is suspected and who approved the disposition so that the decision can be traced later.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to document ceramic PCB edge chips, tell them apart from suspected cracks, and check the remaining distance to copper before accepting a part.<\/p>\n","protected":false},"author":32827,"featured_media":38511,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[174],"tags":[9138,9139,9141,9140],"class_list":["post-38513","post","type-post","status-publish","format-standard","hentry","category-bestpcb","tag-ceramic-pcb-edge-chipping","tag-ceramic-substrate-inspection","tag-copper-edge-clearance","tag-laser-scribing"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Learn how 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