{"id":5912,"date":"2026-07-08T08:43:00","date_gmt":"2026-07-08T00:43:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=5912"},"modified":"2026-06-25T10:01:12","modified_gmt":"2026-06-25T02:01:12","slug":"fr4-pcb-material","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/","title":{"rendered":"FR4-piirilevyjen materiaali selitettyn\u00e4"},"content":{"rendered":"<p>FR4 on ollut piirilevyjen vakiomateriaali jo vuosikymmenten ajan. Sen s\u00e4hk\u00f6isten ominaisuuksien, mekaanisen lujuuden ja edullisuuden yhdistelm\u00e4 tekee siit\u00e4 sopivan materiaalin kaikenlaisiin sovelluksiin yksinkertaisista kuluttajatuotteista monimutkaisiin monikerroksisiin piirilevyihin.<\/p><p>Vaikka nyky\u00e4\u00e4n on saatavilla monia erikoistuneita laminaatteja, FR4 on edelleen useimpien ensisijainen valinta <a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/what-is-a-pcb-design\/\">piirilevyjen suunnittelu<\/a> koska se tarjoaa hyv\u00e4n tasapainon luotettavuuden ja valmistuskustannusten v\u00e4lill\u00e4.<\/p><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\/2026\/06\/FR4-PCB.jpg\" alt=\"FR4-piirilevy\" class=\"wp-image-5913\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><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\">Sis\u00e4llysluettelo<\/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\/fi\/blog\/fr4-pcb-material\/#What_FR4_Means\" >Mit\u00e4 FR4 tarkoittaa<\/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.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#How_FR4_Is_Used_in_PCB_Manufacturing\" >FR4:n k\u00e4ytt\u00f6 piirilevyjen valmistuksessa<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Single-Sided_Boards\" >Yksipuoliset levyt<\/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\/fi\/blog\/fr4-pcb-material\/#Double-Sided_Boards\" >Kaksipuoliset levyt<\/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\/fi\/blog\/fr4-pcb-material\/#Multilayer_Boards\" >Monikerroksiset levyt<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Common_FR4_Material_Properties\" >FR4-materiaalin yleiset ominaisuudet<\/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.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Standard_TG_and_High_TG_FR4\" >Tavallinen TG ja korkea TG FR4<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Standard_TG_Materials\" >TG-vakiomateriaalit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#High_TG_Materials\" >Korkean TG-arvon omaavat materiaalit<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Advantages_of_FR4\" >FR4:n edut<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Cost_Efficiency\" >Kustannustehokkuus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Mature_Manufacturing_Process\" >Kehittynyt valmistusprosessi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Mechanical_Stability\" >Mekaaninen vakaus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Wide_Availability\" >Laaja saatavuus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Suitable_for_Most_Applications\" >Sopii useimpiin k\u00e4ytt\u00f6tarkoituksiin<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Limitations_of_FR4\" >FR4:n rajoitukset<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Higher_Signal_Loss\" >Suurempi signaalih\u00e4vi\u00f6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Limited_Thermal_Conductivity\" >Rajoitettu l\u00e4mm\u00f6njohtavuus<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Dk_Variation\" >Dk-muunnelma<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Not_Ideal_for_RF_Applications\" >Ei sovellu RF-sovelluksiin<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Popular_FR4_Material_Brands\" >Suosittuja FR4-materiaalimerkkej\u00e4<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Shengyi\" >Shengyi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Kingboard\" >Kingboard<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#ITEQ\" >ITEQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Isola\" >Isola<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Ventec\" >Ventec<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Typical_Applications_of_FR4\" >FR4:n tyypilliset k\u00e4ytt\u00f6kohteet<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Consumer_Electronics\" >Viihde-elektroniikka<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Industrial_Equipment\" >TeollisuuslaitteetN\/OFF)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Automotive_Electronics\" >Autoteollisuuden elektroniikka<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Medical_Devices\" >L\u00e4\u00e4kinn\u00e4lliset laitteet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#Communication_Products\" >Viestint\u00e4tuotteet<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#When_FR4_Is_No_Longer_Enough\" >Kun FR4 ei en\u00e4\u00e4 riit\u00e4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/fr4-pcb-material\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_FR4_Means\"><\/span>Mit\u00e4 FR4 tarkoittaa<span class=\"ez-toc-section-end\"><\/span><\/h2><p>FR tarkoittaa palonkest\u00e4vyytt\u00e4, kun taas numero 4 viittaa NEMA-standardin mukaisiin luokituksiin.<\/p><p>FR4 on valmistettu epoksihartsilla kyll\u00e4stetyst\u00e4 lasikuitukankaasta. L\u00e4mm\u00f6n ja paineen alaisena kovettumisen j\u00e4lkeen materiaalista muodostuu j\u00e4ykk\u00e4 erist\u00e4v\u00e4 alusta, jolle voidaan kiinnitt\u00e4\u00e4 kuparikerroksia ja elektroniikkakomponentteja.<\/p><p>Aineisto tarjoaa:<\/p><ul class=\"wp-block-list\"><li>Hyv\u00e4 mekaaninen lujuus<\/li>\n\n<li>Vakaat s\u00e4hk\u00f6iset ominaisuudet<\/li>\n\n<li>Erinomainen eristys<\/li>\n\n<li>Kosteudenkest\u00e4vyys<\/li>\n\n<li>Alhaiset valmistuskustannukset<\/li><\/ul><p>N\u00e4m\u00e4 ominaisuudet selitt\u00e4v\u00e4t, miksi FR4 on hallitseva materiaali <a href=\"https:\/\/www.topfastpcb.com\/fi\/pcb-industries\/\">PCB-teollisuus<\/a>.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_FR4_Is_Used_in_PCB_Manufacturing\"><\/span>FR4:n k\u00e4ytt\u00f6 piirilevyjen valmistuksessa<span class=\"ez-toc-section-end\"><\/span><\/h2><p>FR4 toimii kuparikerrosten v\u00e4lisen\u00e4 dielektrisen\u00e4 materiaalina.<\/p><p>Tyypillisi\u00e4 rakenteita ovat muun muassa:<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Single-Sided_Boards\"><\/span>Yksipuoliset levyt<span class=\"ez-toc-section-end\"><\/span><\/h3><p>K\u00e4ytt\u00f6kohteet:<\/p><ul class=\"wp-block-list\"><li>Virtal\u00e4hteet<\/li>\n\n<li>Kodinkoneet<\/li>\n\n<li>LED-tuotteet<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Double-Sided_Boards\"><\/span>Kaksipuoliset levyt<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Yleist\u00e4:<\/p><ul class=\"wp-block-list\"><li>Teollisuusohjaimet<\/li>\n\n<li>Autoelektroniikka<\/li>\n\n<li>Viestint\u00e4laitteet<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Multilayer_Boards\"><\/span>Monikerroksiset levyt<span class=\"ez-toc-section-end\"><\/span><\/h3><p>K\u00e4ytet\u00e4\u00e4n yleisesti:<\/p><ul class=\"wp-block-list\"><li>Palvelimet<\/li>\n\n<li>L\u00e4\u00e4kinn\u00e4lliset laitteet<\/li>\n\n<li>Verkkolaitteet<\/li>\n\n<li>Sulautetut j\u00e4rjestelm\u00e4t<\/li><\/ul><p>Nykyaikaiset 4\u201320-kerroksiset piirilevyt valmistetaan yleens\u00e4 FR4-laminaateista ja prepreg-materiaaleista.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_FR4_Material_Properties\"><\/span>FR4-materiaalin yleiset ominaisuudet<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Vaikka tekniset tiedot vaihtelevat valmistajittain, tavanomaisilla FR4-materiaaleilla on yleens\u00e4 seuraavat ominaisuudet.<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Kiinteist\u00f6<\/th><th>Tyypillinen arvo<\/th><\/tr><tr><td>Dielektrisyysvakio (Dk)<\/td><td>4.2-4.8<\/td><\/tr><tr><td>H\u00e4vi\u00f6kerroin (Df)<\/td><td>0.015-0.025<\/td><\/tr><tr><td>Lasittumisl\u00e4mp\u00f6tila<\/td><td>130\u2013170 \u00b0C<\/td><\/tr><tr><td>L\u00e4mm\u00f6njohtavuus<\/td><td>0,3\u20130,4 W\/m\u00b7K<\/td><\/tr><tr><td>Tilavuusresistiivisyys<\/td><td>&gt;10\u00b9\u00b2 \u03a9\u00b7cm<\/td><\/tr><tr><td>Paloluokitus<\/td><td>UL94 V-0<\/td><\/tr><\/tbody><\/table><\/figure><p>N\u00e4m\u00e4 arvot sopivat useimpiin hidas- ja keskikierroksisiin elektroniikkatuotteisiin.<\/p><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\/2026\/06\/FR4-PCB-1.jpg\" alt=\"FR4-piirilevy\" class=\"wp-image-5914\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Standard_TG_and_High_TG_FR4\"><\/span>Tavallinen TG ja korkea TG FR4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Yksi FR4:n t\u00e4rkeist\u00e4 ominaisuuksista on lasittumisl\u00e4mp\u00f6tila (TG).<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Standard_TG_Materials\"><\/span>TG-vakiomateriaalit<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Tyypilliset TG-arvot vaihtelevat v\u00e4lill\u00e4 130 \u00b0C \u2013 140 \u00b0C.<\/p><p>Sovelluksia ovat mm:<\/p><ul class=\"wp-block-list\"><li>Viihde-elektroniikka<\/li>\n\n<li>Kodinkoneet<\/li>\n\n<li>Yleiset teollisuustuotteet<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"High_TG_Materials\"><\/span>Korkean TG-arvon omaavat materiaalit<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Korkean TG-arvon omaavien laminaattien TG-arvot ovat yleens\u00e4 yli 170 \u00b0C.<\/p><p>Ne tarjoavat paremman suorituskyvyn seuraavissa olosuhteissa:<\/p><ul class=\"wp-block-list\"><li>Lyijyt\u00f6n kokoonpano<\/li>\n\n<li>Korkeat k\u00e4ytt\u00f6l\u00e4mp\u00f6tilat<\/li>\n\n<li>Useita uudelleenjuotosjaksoja<\/li><\/ul><p>TG-arvoltaan korkeita materiaaleja esiintyy yleisesti seuraavissa:<\/p><ul class=\"wp-block-list\"><li>Autoelektroniikka<\/li>\n\n<li>Virtal\u00e4hteet<\/li>\n\n<li>Palvelimet<\/li>\n\n<li>Televiestint\u00e4laitteet<\/li><\/ul><p><em>Sis\u00e4inen linkki: <a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/high-tg-fr4-pcb\/\">Korkean TG-arvon FR4-piirilevy<\/a><\/em><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advantages_of_FR4\"><\/span>FR4:n edut<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Useat tekij\u00e4t tekev\u00e4t FR4:st\u00e4 alan yleisimmin k\u00e4ytetyn substraatin.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cost_Efficiency\"><\/span>Kustannustehokkuus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>FR4 on huomattavasti edullisempaa kuin RF-laminaatit ja erikoismateriaalit.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mature_Manufacturing_Process\"><\/span>Kehittynyt valmistusprosessi<span class=\"ez-toc-section-end\"><\/span><\/h3><p>L\u00e4hes kaikki piirilevyvalmistajat tarjoavat FR4-levyjen valmistusta.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mechanical_Stability\"><\/span>Mekaaninen vakaus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Lasikuiturakenne takaa erinomaisen j\u00e4ykkyyden ja mittavakauden.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Wide_Availability\"><\/span>Laaja saatavuus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Suuret toimittajat, kuten Shengyi, Kingboard, ITEQ ja Isola, tarjoavat lukuisia FR4-tuoteperheit\u00e4.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Suitable_for_Most_Applications\"><\/span>Sopii useimpiin k\u00e4ytt\u00f6tarkoituksiin<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Useita gigahertsej\u00e4 alhaisemmilla taajuuksilla FR4 t\u00e4ytt\u00e4\u00e4 yleens\u00e4 s\u00e4hk\u00f6iset vaatimukset ilman kohtuuttomia kustannuksia.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Limitations_of_FR4\"><\/span>FR4:n rajoitukset<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Monipuolisuudestaan huolimatta FR4 ei sovellu kaikkiin k\u00e4ytt\u00f6tarkoituksiin.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Higher_Signal_Loss\"><\/span>Suurempi signaalih\u00e4vi\u00f6<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Verrattuna v\u00e4h\u00e4h\u00e4vi\u00f6isiin laminaatteihin FR4:ll\u00e4 on suurempi dielektrinen h\u00e4vi\u00f6 korkeilla taajuuksilla.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Limited_Thermal_Conductivity\"><\/span>Rajoitettu l\u00e4mm\u00f6njohtavuus<span class=\"ez-toc-section-end\"><\/span><\/h3><p>L\u00e4mm\u00f6npoistokyky on suhteellisen heikko.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Dk_Variation\"><\/span>Dk-muunnelma<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Dielektrisyysvakio vaihtelee taajuuden ja valmistusolosuhteiden mukaan, mik\u00e4 voi vaikuttaa impedanssin tasaisuuteen.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Not_Ideal_for_RF_Applications\"><\/span>Ei sovellu RF-sovelluksiin<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Mikroaalto- ja millimetriaaltosuunnittelu vaatii usein erikoismateriaaleja.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Popular_FR4_Material_Brands\"><\/span>Suosittuja FR4-materiaalimerkkej\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Markkinoita hallitsevat useat laminaattivalmistajat.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Shengyi\"><\/span>Shengyi<span class=\"ez-toc-section-end\"><\/span><\/h3><p>K\u00e4ytet\u00e4\u00e4n laajalti Aasiassa ja tunnetaan vakaasta laadustaan.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Kingboard\"><\/span>Kingboard<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Yksi maailman suurimmista piirilevylaminaattien toimittajista.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"ITEQ\"><\/span>ITEQ<span class=\"ez-toc-section-end\"><\/span><\/h3><p>K\u00e4ytet\u00e4\u00e4n usein verkko- ja teollisuussovelluksissa.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Isola\"><\/span>Isola<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Suosittuja Pohjois-Amerikassa ja eritt\u00e4in luotettavia tuotteita.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ventec\"><\/span>Ventec<span class=\"ez-toc-section-end\"><\/span><\/h3><p>Tarjoaa nopeita ja l\u00e4mm\u00f6nhallintaan tarkoitettuja materiaaleja.<\/p><p>Eri valmistajat tarjoavat vastaavia laatuluokkia, mink\u00e4 ansiosta insin\u00f6\u00f6rit voivat optimoida kustannuksia ja toimitusketjun joustavuutta.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Typical_Applications_of_FR4\"><\/span>FR4:n tyypilliset k\u00e4ytt\u00f6kohteet<span class=\"ez-toc-section-end\"><\/span><\/h2><p>FR4-levyj\u00e4 k\u00e4ytet\u00e4\u00e4n l\u00e4hes kaikilla elektroniikan aloilla.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Consumer_Electronics\"><\/span>Viihde-elektroniikka<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>\u00c4lylaitteet<\/li>\n\n<li>Kodinkoneet<\/li>\n\n<li>Virtal\u00e4hteet<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Industrial_Equipment\"><\/span>TeollisuuslaitteetN\/OFF)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>PLC-j\u00e4rjestelm\u00e4t<\/li>\n\n<li>Invertterit<\/li>\n\n<li>Automaatio-ohjaimet<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Automotive_Electronics\"><\/span>Autoteollisuuden elektroniikka<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Korin ohjausmoduulit<\/li>\n\n<li>Anturit<\/li>\n\n<li>Viihde- ja tietoj\u00e4rjestelm\u00e4t<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Medical_Devices\"><\/span>L\u00e4\u00e4kinn\u00e4lliset laitteet<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Valvontalaitteet<\/li>\n\n<li>Kannettavat laitteet<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Communication_Products\"><\/span>Viestint\u00e4tuotteet<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Reitittimet<\/li>\n\n<li>Kytkimet<\/li>\n\n<li>Verkkomoduulit<\/li><\/ul><p>Ellei kyseess\u00e4 ole korkeita taajuuksia tai \u00e4\u00e4rimm\u00e4isi\u00e4 l\u00e4mp\u00f6tiloja, FR4 on edelleen k\u00e4yt\u00e4nn\u00f6llinen ja taloudellinen valinta.<\/p><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\/2026\/06\/FR4-PCB-2.jpg\" alt=\"FR4-piirilevy\" class=\"wp-image-5915\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2026\/06\/FR4-PCB-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"When_FR4_Is_No_Longer_Enough\"><\/span>Kun FR4 ei en\u00e4\u00e4 riit\u00e4<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Kun tiedonsiirtonopeudet ja taajuudet kasvavat jatkuvasti, insin\u00f6\u00f6rit t\u00f6rm\u00e4\u00e4v\u00e4t usein perinteisen FR4-materiaalin rajoituksiin.<\/p><p>Sovellukset, kuten:<\/p><ul class=\"wp-block-list\"><li>5G-infrastruktuuri<\/li>\n\n<li>Nopeat palvelimet<\/li>\n\n<li>Tutkaj\u00e4rjestelm\u00e4t<\/li>\n\n<li>RF-moduulit<\/li><\/ul><p>saattaa edellytt\u00e4\u00e4 materiaaleja, joissa on:<\/p><ul class=\"wp-block-list\"><li>Pienempi dielektrinen h\u00e4vi\u00f6<\/li>\n\n<li>Vakaammat Dk-arvot<\/li>\n\n<li>Parannettu l\u00e4mp\u00f6tehokkuus<\/li><\/ul><p>T\u00e4llaisissa tapauksissa Rogers, PTFE, Megtron ja muut v\u00e4h\u00e4h\u00e4vi\u00f6iset materiaalit ovat sopivampia vaihtoehtoja.<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2><div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1782352025515\"><strong class=\"schema-faq-question\">K: Onko FR4 sama asia kuin lasikuitu?<\/strong> <p class=\"schema-faq-answer\">A: Ei aivan. FR4 on lasikuitukankaasta ja epoksihartsista valmistettu komposiittimateriaali. Lasikuitu antaa lujuutta, kun taas hartsi toimii eristeen\u00e4.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782352037888\"><strong class=\"schema-faq-question\">K: Mik\u00e4 on FR4:n dielektrisyysvakio?<\/strong> <p class=\"schema-faq-answer\">A: Useimpien FR4-materiaalien dielektrisyysvakio on v\u00e4lill\u00e4 4,2\u20134,8, riippuen taajuudesta ja hartsij\u00e4rjestelm\u00e4st\u00e4.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782352051553\"><strong class=\"schema-faq-question\">K: Soveltuuko FR4 nopeiden piirilevyjen suunnitteluun?<\/strong> <p class=\"schema-faq-answer\">V: FR4 sopii hyvin moniin keskinopeisiin sovelluksiin. Eritt\u00e4in nopeat tai RF-piirit saattavat vaatia v\u00e4h\u00e4h\u00e4vi\u00f6isi\u00e4 materiaaleja.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782352064778\"><strong class=\"schema-faq-question\">K: Mit\u00e4 tarkoittaa \u201dHigh TG FR4\u201d?<\/strong> <p class=\"schema-faq-answer\">A: Korkean TG-arvon FR4-materiaaleilla tarkoitetaan materiaaleja, joiden lasittumisl\u00e4mp\u00f6tila on yli 170 \u00b0C, mik\u00e4 takaa paremman l\u00e4mp\u00f6stabiilisuuden.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1782352077146\"><strong class=\"schema-faq-question\">K: Mitk\u00e4 yritykset valmistavat FR4-materiaaleja?<\/strong> <p class=\"schema-faq-answer\">V: T\u00e4rkeimpi\u00e4 toimittajia ovat Shengyi, Kingboard, ITEQ, Isola ja Ventec.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>FR4 on yleisimmin k\u00e4ytetty piirilevyn substraatti, sill\u00e4 siin\u00e4 yhdistyv\u00e4t tasapainoisesti s\u00e4hk\u00f6iset ominaisuudet, mekaaninen lujuus ja edullinen hinta. T\u00e4ss\u00e4 artikkelissa k\u00e4sitell\u00e4\u00e4n FR4:n ominaisuuksia, korkean TG-arvon materiaaleja, t\u00e4rkeimpi\u00e4 laminaattitoimittajia sek\u00e4 tilanteita, joissa FR4 on edelleen ensisijainen valinta nykyaikaisessa piirilevyvalmistuksessa.<\/p>","protected":false},"author":1,"featured_media":5916,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[483,484],"class_list":["post-5912","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-fr4-pcb","tag-pcb-material"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>FR4 PCB Material Explained<\/title>\n<meta name=\"description\" content=\"Discover the properties, advantages, limitations, and applications of FR4 PCB material. 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