{"id":4641,"date":"2026-01-19T09:23:39","date_gmt":"2026-01-19T09:23:39","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4641"},"modified":"2026-01-19T09:23:44","modified_gmt":"2026-01-19T09:23:44","slug":"fr-4-pcb-guide-properties-limits-material-choices","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/da\/fr-4-pcb-guide-properties-limits-material-choices\/","title":{"rendered":"FR-4 PCB-guide: Egenskaber, gr\u00e6nser og materialevalg"},"content":{"rendered":"<h2 class=\"wp-block-heading\">fr4 - definition og betydning<\/h2>\n\n\n\n<p>fr4 er koden for den flammeh\u00e6mmende klassificering af et glasfiberforst\u00e6rket epoxy-kobberbekl\u00e6dt laminat. Det betyder, at harpiksen skal holde op med at br\u00e6nde af sig selv efter at v\u00e6re blevet ant\u00e6ndt. fr4 er ikke navnet p\u00e5 et bestemt materiale. Det er en materialekvalitet, der bruges til PCB'er (printed circuit boards).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">sammens\u00e6tning og almindelige typer<\/h2>\n\n\n\n<p>Der er mange slags fr4-materialer, der bruges i normale printkort. De fleste er kompositmaterialer lavet af en s\u00e5kaldt tetrafunktionel epoxyharpiks plus fyldstoffer og glasfiber.<\/p>\n\n\n\n<p>Eksempel: Hvis en PCB-specifikation lyder <strong>fr4 T:1.0 D\/S<\/strong>, betyder det: fr4 flammeh\u00e6mmende kvalitet, T:1,0 betyder tykkelse 1,0 mm, D\/S betyder dobbeltsidet. Med andre ord er pladematerialet et dobbeltsidet kobberbekl\u00e6dt laminat af epoxyglasdug, 1 mm tykt, dobbeltsidet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">fr4 - vigtige egenskaber og klassifikationer<\/h2>\n\n\n\n<p>Teknisk set har fr4-laminater en r\u00e6kke vigtige specifikationer. Disse omfatter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>b\u00f8jningsstyrke og afskalningsstyrke samt ydeevne ved termisk chok;<\/li>\n\n\n\n<li>st\u00e6rk flammeh\u00e6mning;<\/li>\n\n\n\n<li>volumenresistivitet og overflade-resistivitet;<\/li>\n\n\n\n<li>dielektrisk konstant (Dk) og spredningsfaktor (tabstangent);<\/li>\n\n\n\n<li>glasovergangstemperatur (Tg);<\/li>\n\n\n\n<li>dimensionsstabilitet, maksimal brugstemperatur og sk\u00e6vhed.<\/li>\n<\/ul>\n\n\n\n<p>Disse egenskaber definerer tilsammen fr4's ydeevne ved fremstilling af printkort.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">andre almindelige PCB-basismaterialer<\/h2>\n\n\n\n<p>\u25c9 Glasfiberbaserede plader<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Glasfiberplader: fr4 og fr5<br>Begge bruger specielt elektronisk stof, der er dyppet i epoxy (eller epoxy-phenolic) harpiks. Derefter h\u00e6rdes de under h\u00f8j varme og tryk. fr4 er den mest anvendte plade til fremstilling af printkort. Det har gode elektriske egenskaber, god mekanisk styrke og varmebestandighed. Det bruges i vid udstr\u00e6kning til produktion af flerlags printkort.<\/li>\n<\/ol>\n\n\n\n<p>\u25c9 Papirbaserede plader<br>2. Papirtavler: fr-1, fr-2, fr-3<br>Phenolic paper boards bruger phenolic resin som bindemiddel og wood-pulp fiberdug som overfladeforst\u00e6rkning. De fremstilles under h\u00f8j varme og tryk.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp\" alt=\"Paper based boards\" class=\"wp-image-4642\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-300x169.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-768x432.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>\u25c9 Sammensatte plader<br>3. Sammensatte plader: CEM-1 og CEM-3<br>Kompositplader omfatter CEM-serien af kobberbekl\u00e6dte laminater. CEM-1 bruger epoxypapir som kerne. CEM-3 bruger ikke-v\u00e6vet stof af epoxyglas som kerne. Disse CEM-plader er nemme at bearbejde. De har god planhed, dimensionsstabilitet og pr\u00e6cis tykkelse. Deres mekaniske styrke, dielektriske egenskaber, vandabsorption og modstandsdygtighed over for metalmigration er alle bedre end papirplader. CEM-3 kan n\u00e5 op p\u00e5 ca. 80% af fr4\u2019s mekaniske styrke, men koster normalt mindre.<\/p>\n\n\n\n<p>\u25c9 S\u00e6rlige materialeplader<br>4. S\u00e6rlige bestyrelser (f.eks, <a href=\"https:\/\/flj-pcb.com\/da\/pcb-manufacturer\/ceramic-pcb\/\" data-type=\"page\" data-id=\"2364\">keramik og metal<\/a>)<br>Disse omfatter keramiske substrater og metalkerneplader. De har s\u00e6rlige egenskaber til anvendelser, der kr\u00e6ver h\u00f8jere materialeydelse.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"469\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp\" alt=\"ceramic pcb\" class=\"wp-image-4643\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp 500w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-300x281.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-13x12.webp 13w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">fordele og begr\u00e6nsninger ved fr4<\/h2>\n\n\n\n<p>Siden jeg begyndte at designe printkort, har fr4 v\u00e6ret standardmaterialet. I starten kaldte nogle designere alle print for \u201cfr4\u201d, uanset om det var det eller ej. fr4 er et flammeh\u00e6mmende, type 4, glasfiberforst\u00e6rket epoxylaminat. Det er omkostningseffektivt. Det er en god elektrisk isolator. Det er st\u00e6rkt under b\u00e5de t\u00f8rre og fugtige forhold. Det er ogs\u00e5 nemt at lave til plader. Af disse grunde er fr4 et almindeligt valg til opbygning af printkort.<\/p>\n\n\n\n<p>fr4 har gr\u00e6nser. Det kan l\u00f8be ind i problemer, n\u00e5r der er for meget str\u00f8m, sp\u00e6nding eller varme. Hvis du presser det ud over dets gr\u00e6nser, vil dets dielektriske egenskaber falde. Det betyder, at materialet mister sin isoleringsevne og begynder at lede. Et andet problem er at holde en stabil impedans i h\u00f8jhastighedsdesigns. fr4\u2019s dielektriske konstant kan variere p\u00e5 tv\u00e6rs af kortets l\u00e6ngde og bredde. N\u00e5r designhastighederne stiger, kan signaltab, som var acceptabelt i lavhastighedskort, blive for h\u00f8jt p\u00e5 fr4-kort.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Er fr4 det bedste valg til h\u00f8jhastigheds PCB-design?<\/h2>\n\n\n\n<p>N\u00e5r vi p\u00e5tager os et projekt uden for vores komfortzone, l\u00e6rer vi nye gr\u00e6nser at kende. For mig kom den dag, da min chef bad om en <a href=\"https:\/\/flj-pcb.com\/da\/pcb-manufacturer\/high-speed-pcb\/\" data-type=\"page\" data-id=\"2370\">H\u00f8jhastighedskort<\/a>. Jeg vidste, at h\u00f8jhastighedsdesign medf\u00f8rer begr\u00e6nsninger, som vi ikke ser i normale kredsl\u00f8b. F\u00f8rst lavede jeg et skema, der passede til h\u00f8j hastighed. Derefter fokuserede jeg p\u00e5, om h\u00f8jhastighedsprototypen skulle bruge fr4 eller et mere specialiseret materiale. F\u00f8r du v\u00e6lger, skal du bem\u00e6rke, at denne tekst bruger \u201ch\u00f8jhastighed\u201d til alt over <strong>50 MHz<\/strong>. Det er de v\u00e6sentligste problemer i det frekvensomr\u00e5de.<\/p>\n\n\n\n<p>H\u00f8jhastighedsdesigns har strengere regler for signalintegritet. Du skal kontrollere routing n\u00f8je for at opfylde disse regler. Men selve printmaterialet er en del af signalintegritetsligningen. S\u00e5 materialet til h\u00f8jhastighedskort skal have en stram Dk-tolerance og andre kontrollerede egenskaber, der hj\u00e6lper med at kontrollere impedansen. Hvis impedansen varierer p\u00e5 tv\u00e6rs af designet, vil h\u00f8jhastighedssignaler reflektere energi tilbage, n\u00e5r de bev\u00e6ger sig, og signalet vil blive forvr\u00e6nget. En lav tabstangent hj\u00e6lper ogs\u00e5 med at holde signalet st\u00e6rkt. Endelig er termisk stabilitet med til at sikre, at de dielektriske egenskaber ikke nedbrydes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">hvordan specialiserede h\u00f8jhastighedsmaterialer sammenlignes med fr4<\/h2>\n\n\n\n<p>S\u00e6rlige h\u00f8jhastighedsmaterialer, som f.eks. h\u00e6rdede kulbrintelaminater og PTFE-laminater, giver ofte bedre og mere p\u00e5lidelig ydeevne i h\u00f8jfrekvente konstruktioner end fr4. Nedenfor er nogle af de vigtigste fordele ved disse materialer:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"525\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp\" alt=\"high-speed pcb\" class=\"wp-image-4645\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-300x225.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-16x12.webp 16w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Reduceret signaltab.<\/strong> N\u00e5r transmissionslinjens frekvens stiger, vokser signaltabet. H\u00f8jhastighedslaminater har meget lavere tabstangent end fr4. Nogle materialer, som n\u00e6sten rene PTFE-laminater, er en st\u00f8rrelsesorden bedre. Lavere tabstangent er en n\u00f8glefaktor til at reducere signaltabet.<\/li>\n\n\n\n<li><strong>Strammere impedansstyring.<\/strong> Traditionelle materialer som fr4 kan ikke holde den dielektriske konstant (Dk) s\u00e5 t\u00e6t som h\u00f8jhastighedsmaterialer. fr4 Dk kan variere med \u00b110% eller mere. Materialer som PTFE kan holde Dk inden for ca. \u00b12% eller bedre.<\/li>\n\n\n\n<li><strong>Bedre termisk styring.<\/strong> Nogle h\u00f8jhastighedslaminater (f.eks. termoh\u00e6rdende kulbrintelaminater) har meget bedre varmeledningsevne end fr4. Hvis dit design skal kunne h\u00e5ndtere varme, er disse laminater v\u00e6rd at unders\u00f8ge.<\/li>\n\n\n\n<li><strong>Lavere optagelse af fugt.<\/strong> Vand har dielektriske effekter. Selv en lille smule fugt i et printkort kan \u00e6ndre den elektriske ydeevne i h\u00f8jfrekvente kredsl\u00f8b. Selvom teksten siger, at fr4-fugtabsorptionen er n\u00e6r 50%, kan nogle h\u00f8jhastighedsmaterialer (f.eks. nogle PTFE-laminater) have meget lavere fugtoptagelse, n\u00e6r 2%, og det hj\u00e6lper med at opretholde en stabil elektrisk opf\u00f8rsel.<\/li>\n\n\n\n<li><strong>St\u00e6rkere dimensionel stabilitet.<\/strong> T\u00e6tte h\u00f8jhastighedslayouts kr\u00e6ver stram dimensionel kontrol. fr4 er kendt for god dimensionel stabilitet, men nogle h\u00f8jhastighedsmaterialer giver en bedre samlet ydeevne til design med strenge tolerancer. I s\u00e5danne tilf\u00e6lde kan termoh\u00e6rdede kulbrintelaminater v\u00e6re et bedre valg.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>fr4 \u2014 definition and meaning fr4 is the code for the flame-retardant rating of a glass-fiber reinforced epoxy copper clad 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