{"id":3754,"date":"2025-08-03T08:54:00","date_gmt":"2025-08-03T00:54:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3754"},"modified":"2025-08-02T18:25:55","modified_gmt":"2025-08-02T10:25:55","slug":"key-parameters-of-pcb-circuit-boards","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/","title":{"rendered":"Nyckelparametrar f\u00f6r PCB-kretskort"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Inneh\u00e5llsf\u00f6rteckning<\/p>\n<span class=\"ez-toc-title-toggle\"><\/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.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#Detailed_Explanation_of_Key_PCB_Parameters\" >Detaljerad f\u00f6rklaring av viktiga PCB-parametrar<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#1_Electrical_Performance_Parameters\" >1. Parametrar f\u00f6r elektrisk prestanda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#2_Thermal_Performance_Parameters\" >2. Parametrar f\u00f6r termisk prestanda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#3_Mechanical_Performance_Parameters\" >3. Parametrar f\u00f6r mekaniska prestanda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#4_Structural_Characteristics\" >4. Strukturella egenskaper<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#5_Reliability_Testing_Metrics\" >5. Metriker f\u00f6r tillf\u00f6rlitlighetstestning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#6_Environmental_Process_Compliance\" >6. Efterlevnad av milj\u00f6- och processregler<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#PCB_Board_Classification_and_Selection\" >Klassificering och urval av kretskort<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#1_Common_PCB_Materials\" >1. Vanliga PCB-material<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#2_PCB_Material_Grades_Comparison\" >2. J\u00e4mf\u00f6relse av PCB-materialkvaliteter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/#3_How_to_Choose_the_Right_PCB_Material\" >3. Hur v\u00e4ljer man r\u00e4tt PCB-material?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Detailed_Explanation_of_Key_PCB_Parameters\"><\/span><strong>Detaljerad f\u00f6rklaring av viktiga PCB-parametrar<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Electrical_Performance_Parameters\"><\/span><strong>1. Parametrar f\u00f6r elektrisk prestanda<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>De elektriska egenskaperna hos ett m\u00f6nsterkort p\u00e5verkar direkt signalintegriteten, s\u00e4rskilt i h\u00f6gfrekvens- och h\u00f6ghastighetskretsar.<\/p><ul class=\"wp-block-list\"><li><strong>Dielektrisk konstant (Dk)<\/strong> - M\u00e4ter ett materials f\u00f6rm\u00e5ga att lagra elektrisk energi. L\u00e4gre Dk-v\u00e4rden (t.ex. PTFE med Dk\u22482,2) m\u00f6jligg\u00f6r snabbare signal\u00f6verf\u00f6ring, vilket g\u00f6r dem idealiska f\u00f6r 5G- och millimeterv\u00e5gsapplikationer.<\/li>\n\n<li><strong>Dissipationsfaktor (Df\/Loss Tangent)<\/strong> - Indikerar f\u00f6rlust av signalenergi. H\u00f6gfrekventa till\u00e4mpningar (t.ex. radar, satellitkommunikation) kr\u00e4ver Df &lt; 0,005.<\/li>\n\n<li><strong>Resistivitet yta\/volym<\/strong> - H\u00f6g isoleringsresistans (&gt;10\u00b9\u00b2 \u03a9-cm) f\u00f6rhindrar l\u00e4ckstr\u00f6mmar, vilket \u00e4r avg\u00f6rande f\u00f6r h\u00f6gsp\u00e4nningskretskort (t.ex. kraftmoduler).<\/li>\n\n<li><strong>Nedbrytningssp\u00e4nning<\/strong> - Standard FR4 klarar \u226520 kV\/mm, medan keramiska substrat klarar upp till 50 kV\/mm.<\/li>\n\n<li><strong>Impedansreglering<\/strong> - H\u00f6ghastighetskretskort (t.ex. DDR5, PCIe 6.0) kr\u00e4ver sn\u00e4v impedanstolerans (\u00b15%) f\u00f6r att minimera signalreflektioner.<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters.jpg\" alt=\"PCB-parametrar\" class=\"wp-image-3756\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Thermal_Performance_Parameters\"><\/span><strong>2. Parametrar f\u00f6r termisk prestanda<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>Ett m\u00f6nsterkorts v\u00e4rmebest\u00e4ndighet avg\u00f6r dess tillf\u00f6rlitlighet i milj\u00f6er med h\u00f6ga temperaturer, s\u00e4rskilt f\u00f6r blyfri l\u00f6dning och l\u00e5ngsiktig stabilitet.<\/p><ul class=\"wp-block-list\"><li><strong>Glas\u00f6verg\u00e5ngstemperatur (Tg)<\/strong> - Standard FR4 har Tg\u2248130\u00b0C, medan kretskort med h\u00f6g Tg (Tg\u2265170\u00b0C) anv\u00e4nds i fordons- och milit\u00e4relektronik.<\/li>\n\n<li><strong>Termisk s\u00f6nderdelningstemperatur (Td)<\/strong> - Material med Td &gt; 325\u00b0C (t.ex. Isola 370HR) \u00e4r att f\u00f6redra f\u00f6r blyfri l\u00f6dning.<\/li>\n\n<li><strong>Termisk konduktivitet<\/strong> - FR4 har l\u00e5g v\u00e4rmeledningsf\u00f6rm\u00e5ga (~0,3 W\/m-K), medan kretskort med metallk\u00e4rna (t.ex. aluminium) kan n\u00e5 10 W\/m-K, vilket g\u00f6r dem idealiska f\u00f6r LED-kylning.<\/li>\n\n<li><strong>Koefficient f\u00f6r termisk expansion (CTE)<\/strong> - Z-axelns CTE b\u00f6r vara &lt;50 ppm\/\u00b0C f\u00f6r att f\u00f6rhindra delaminering i flerskiktskretskort (IC-substrat kr\u00e4ver CTE\u22486 ppm\/\u00b0C).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Mechanical_Performance_Parameters\"><\/span><strong>3. Parametrar f\u00f6r mekaniska prestanda<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>Mekanisk h\u00e5llfasthet p\u00e5verkar monteringsprocesser och l\u00e5ngsiktig h\u00e5llbarhet.<\/p><ul class=\"wp-block-list\"><li><strong>B\u00f6jh\u00e5llfasthet<\/strong> - Standard FR4 ligger i intervallet 400-600 MPa, medan flexibla m\u00f6nsterkort (polyimid) kr\u00e4ver &gt;200 MPa.<\/li>\n\n<li><strong>Peel-styrka<\/strong> - Kopparvidh\u00e4ftningen m\u00e5ste \u00f6verstiga 1,0 N\/mm (IPC-standard) f\u00f6r att f\u00f6rhindra att folien lossnar under l\u00f6dningen.<\/li>\n\n<li><strong>Absorption av vatten<\/strong> - L\u00e5g fuktabsorption (&lt;0,2%) f\u00f6rhindrar bl\u00e5sbildning; h\u00f6gfrekvenslaminat h\u00e5ller normalt &lt;0,1%.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Structural_Characteristics\"><\/span><strong>4. Strukturella egenskaper<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>Precision i tillverkningen \u00e4r avg\u00f6rande f\u00f6r <a href=\"https:\/\/www.topfastpcb.com\/sv\/products\/hdi-pcb\/\">sammankoppling med h\u00f6g densitet (HDI)<\/a> och miniatyriserade konstruktioner.<\/p><ul class=\"wp-block-list\"><li><strong>Tolerans f\u00f6r koppartjocklek<\/strong> - Standard 1 oz koppar har \u00b110% tolerans, medan precisionskretsar kr\u00e4ver \u00b15%.<\/li>\n\n<li><strong>Registreringsnoggrannhet lager till lager<\/strong> - HDI-kretskort kr\u00e4ver &lt;25 \u03bcm justering, medan vanliga flerskiktskort till\u00e5ter &lt;50 \u03bcm.<\/li>\n\n<li><strong>Minsta sp\u00e5rvidd\/utrymme (L\/S)<\/strong> - Standardkretskort anv\u00e4nder 0,1 mm\/0,1 mm, medan avancerade IC-substrat uppn\u00e5r 20 \u03bcm\/20 \u03bcm.<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1.jpg\" alt=\"PCB-parametrar\" class=\"wp-image-3757\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Reliability_Testing_Metrics\"><\/span><strong>5. Metriker f\u00f6r tillf\u00f6rlitlighetstestning<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>PCB m\u00e5ste genomg\u00e5 rigor\u00f6sa tester f\u00f6r att s\u00e4kerst\u00e4lla l\u00e5ngsiktig stabilitet.<\/p><ul class=\"wp-block-list\"><li><strong>Ledande anodisk filament (CAF) Motst\u00e5nd<\/strong> - Utv\u00e4rderar kortslutningsrisker under fuktiga f\u00f6rh\u00e5llanden (85\u00b0C\/85% RH i 1000 timmar).<\/li>\n\n<li><strong>Isolationsmotst\u00e5nd p\u00e5 ytan (SIR)<\/strong> - M\u00e5ste \u00f6verstiga 10\u2078 \u03a9 (enligt JIS-standarder).<\/li>\n\n<li><strong>Termisk cykling Testry F\u00f6rdelarK\u00e4rnbaserad HDI<\/strong> - \u00d6verlever 100 cykler (-55\u00b0C till 125\u00b0C) utan sprickbildning (kretskort f\u00f6r fordonsindustrin kr\u00e4ver str\u00e4ngare tester).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Environmental_Process_Compliance\"><\/span><strong>6. Efterlevnad av milj\u00f6- och processregler<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>Milj\u00f6best\u00e4mmelser (t.ex. RoHS, REACH) driver p\u00e5 utvecklingen av PCB-material.<\/p><ul class=\"wp-block-list\"><li><strong>J\u00e4mf\u00f6rande Tracking Index (CTI)<\/strong> - Medicintekniska produkter beh\u00f6ver klass 3 (400-600 V), medan industriella styrsystem kr\u00e4ver klass 2.<\/li>\n\n<li><strong>Halogenfri<\/strong> - Klor-\/bromhalten m\u00e5ste vara &lt;900 ppm f\u00f6r att minska giftiga utsl\u00e4pp.<\/li>\n\n<li><strong>Flamskyddande egenskaper (UL94)<\/strong> - V-0 \u00e4r den h\u00f6gsta klassificeringen, obligatorisk f\u00f6r flyg- och rymdtill\u00e4mpningar.<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_Board_Classification_and_Selection\"><\/span><strong>Klassificering och urval av kretskort<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Common_PCB_Materials\"><\/span><strong>1. Vanliga PCB-material<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>FR4<\/strong> - Standard epoxiglaslaminat f\u00f6r konsumentelektronik.<\/li>\n\n<li><strong>CEM-3<\/strong> - Kompositsubstrat, kostnadseffektivt f\u00f6r enkla dubbelsidiga m\u00f6nsterkort.<\/li>\n\n<li><strong><a href=\"https:\/\/www.topfastpcb.com\/sv\/products\/high-tg-rigid-pcb\/\">PCB med h\u00f6g Tg-halt<\/a> (Tg\u2265170\u00b0C)<\/strong> - V\u00e4rmebest\u00e4ndig f\u00f6r fordons- och milit\u00e4r anv\u00e4ndning.<\/li>\n\n<li><strong>Laminat f\u00f6r h\u00f6gfrekventa till\u00e4mpningar (t.ex. Rogers RO4003C)<\/strong> - L\u00e5g Dk\/Df f\u00f6r 5G\/radartill\u00e4mpningar.<\/li>\n\n<li><strong><a href=\"https:\/\/www.topfastpcb.com\/sv\/products\/metal-core-pcb\/\">Kretskort med metallk\u00e4rna<\/a> (Aluminium\/koppar)<\/strong> - Utm\u00e4rkt v\u00e4rmehantering f\u00f6r lysdioder och kraftmoduler.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_PCB_Material_Grades_Comparison\"><\/span><strong>2. J\u00e4mf\u00f6relse av PCB-materialkvaliteter<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Materialkvalitet<\/th><th>Egenskaper<\/th><th>Typiska till\u00e4mpningar<\/th><\/tr><\/thead><tbody><tr><td><strong>94HB<\/strong><\/td><td>Pappersbaserad, ej flamskyddad<\/td><td>L\u00e5gpris konsumentelektronik<\/td><\/tr><tr><td><strong>94V0<\/strong><\/td><td>Flamskyddad papperssubstrat<\/td><td>Styrkort f\u00f6r hush\u00e5llsapparater<\/td><\/tr><tr><td><strong>CEM-1<\/strong><\/td><td>Enkelsidig glasfiber<\/td><td>Enkla kretsar<\/td><\/tr><tr><td><strong>CEM-3<\/strong><\/td><td>Dubbelsidigt halvglas<\/td><td>L\u00e5gkostnadskretskort med dubbla lager<\/td><\/tr><tr><td><strong>FR4<\/strong><\/td><td>Standard glasfiber<\/td><td>Konsumentelektronik, industriella styrsystem<\/td><\/tr><tr><td><strong>H\u00f6g-Tg FR4<\/strong><\/td><td>Best\u00e4ndig mot h\u00f6ga temperaturer<\/td><td>Fordon, flyg- och rymdindustrin<\/td><\/tr><\/tbody><\/table><\/figure><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3.jpg\" alt=\"PCB-parametrar\" class=\"wp-image-3758\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_How_to_Choose_the_Right_PCB_Material\"><\/span><strong>3. Hur v\u00e4ljer man r\u00e4tt PCB-material?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>H\u00f6gfrekventa till\u00e4mpningar<\/strong> \u2192 Material med l\u00e5g Dk\/Df (Rogers, Taconic).<\/li>\n\n<li><strong>Milj\u00f6er med h\u00f6g temperatur<\/strong> \u2192 Material med h\u00f6g Tg (\u2265170\u00b0C) eller h\u00f6g Td (&gt;325\u00b0C).<\/li>\n\n<li><strong>H\u00f6geffektiv v\u00e4rmeavledning<\/strong> \u2192 Metallk\u00e4rna eller FR4 med h\u00f6g v\u00e4rmeledningsf\u00f6rm\u00e5ga.<\/li>\n\n<li><strong>Milj\u00f6v\u00e4nliga krav<\/strong> \u2192 Halogenfria, RoHS-kompatibla material.<\/li><\/ul><p>Valet av PCB-parametrar p\u00e5verkar direkt produktens prestanda, tillf\u00f6rlitlighet och kostnad. Ingenj\u00f6rer m\u00e5ste v\u00e4lja l\u00e4mpliga kortmaterial (t.ex. FR4, CEM-3, h\u00f6g Tg PCB, etc.) baserat p\u00e5 applikationsscenariot (t.ex. h\u00f6g frekvens, h\u00f6g temperatur, h\u00f6g effekt) och optimera designen f\u00f6r att f\u00f6rb\u00e4ttra signalintegriteten, v\u00e4rmeavledningsf\u00f6rm\u00e5gan och den mekaniska styrkan.<\/p>","protected":false},"excerpt":{"rendered":"<p>Prestanda f\u00f6r PCB-kretskort beror p\u00e5 flera viktiga parametrar, t.ex. dielektrisk konstant (DK-v\u00e4rde), glas\u00f6verg\u00e5ngstemperatur (Tg), v\u00e4rmebest\u00e4ndighet (Td), CTI (krypsp\u00e5rningsindex) och CTE (termisk expansionskoefficient). Olika kortmaterial (t.ex. FR4, CEM-3 och h\u00f6g Tg PCB) \u00e4r l\u00e4mpliga f\u00f6r olika applikationer, s\u00e5som h\u00f6gfrekvent kommunikation, fordonselektronik eller h\u00f6geffektsutrustning.<\/p>","protected":false},"author":1,"featured_media":3759,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[112],"tags":[336],"class_list":["post-3754","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-pcb-parameters"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Key parameters of PCB circuit boards - Topfastpcb<\/title>\n<meta name=\"description\" content=\"Key parameters of PCB circuit boards, including dielectric constant (DK value), glass transition temperature (Tg), heat resistance (Td), CTI, CTE, etc. Understand the characteristics and application scenarios of different board materials (FR4, CEM-3, high Tg PCB) to optimize PCB design and improve performance and reliability.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.topfastpcb.com\/sv\/blog\/key-parameters-of-pcb-circuit-boards\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Key parameters of PCB circuit boards - 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