{"version":"1.0","provider_name":"","provider_url":"https:\/\/www.cezonpcb.com\/zh","author_name":"cezonpcb","author_url":"https:\/\/www.cezonpcb.com\/zh\/author\/cezonpcb\/","title":"FR-4 -","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"xY5yR0g3BV\"><a href=\"https:\/\/www.cezonpcb.com\/zh\/product\/fr-4\/\">FR-4<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.cezonpcb.com\/zh\/product\/fr-4\/embed\/#?secret=xY5yR0g3BV\" width=\"600\" height=\"338\" title=\"\u300a FR-4 \u300b\u2014\" data-secret=\"xY5yR0g3BV\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/www.cezonpcb.com\/wp-includes\/js\/wp-embed.min.js\n<\/script>","thumbnail_url":"https:\/\/www.cezonpcb.com\/wp-content\/uploads\/2026\/10\/0mapqc-compress.webp","thumbnail_width":1920,"thumbnail_height":1080,"description":"FR4 is a glass-reinforced epoxy laminate widely used as the base material for printed circuit boards. It is made by impregnating woven glass fiber with epoxy resin and pressing the layers together under controlled heat and pressure. Known for its excellent mechanical strength, and moisture resistance, FR-4 material provides a stable base for copper layers and ensures consistent signal performance.  Standard FR4 is commonly used for general-purpose PCB fabrication, while higher-Tg grades are often selected for applications that require greater thermal stability, particularly in multilayer boards and lead-free assembly processes."}