[{"data":1,"prerenderedAt":377},["ShallowReactive",2],{"blog-fr4-material-properties-it":3,"header-nav-it":47},{"title":4,"description":5,"date":6,"lastUpdated":6,"category":7,"image":8,"readingTime":9,"wordCount":10,"timeRequired":11,"htmlContent":12,"tags":13,"slug":21,"jsonld":22},"Proprieta del materiale FR4: Dk, Tg, densita, specifiche CTE","Cos'e l'FR-4 e le sue proprieta chiave: costante dielettrica, Tg, Td, CTE, densita e conducibilita termica, oltre alla scelta dell'FR-4 High-Tg.","2026-10-09","materials","/assets/img/pcb/fr4/pcb-fr4-pcb-hero.webp",4,668,"PT4M","\u003Ch2 id=\"punti-chiave\" data-anchor-en=\"key-takeaways\">Punti chiave\u003C/h2>\n\u003Cul>\n\u003Cli>\u003Cstrong>Significato di FR-4:\u003C/strong> 'FR' significa \u003Cstrong>Flame Retardant\u003C/strong> (ritardante di fiamma) e '4' indica la resina epossidica rinforzata con fibra di vetro intrecciata conforme a NEMA LI 1-1998 e UL94 V-0.\u003C/li>\n\u003Cli>\u003Cstrong>Costante dielettrica FR4 (Dk):\u003C/strong> Varia tipicamente da \u003Cstrong>4,2 a 4,7 a 1 GHz\u003C/strong>, diminuendo con l'aumentare della frequenza del segnale in base al rapporto resina/vetro.\u003C/li>\n\u003Cli>\u003Cstrong>Soglie termiche (Tg, Td):\u003C/strong> L'FR-4 standard ha una temperatura di transizione vetrosa ($T_g$) di $130\\text{--}140^\\circ\\text{C}$, il Mid-$T_g$ si attesta a $150^\\circ\\text{C}$ e l'High-$T_g$ raggiunge $170\\text{--}180^\\circ\\text{C}$, essenziale per la saldatura lead-free a $260^\\circ\\text{C}$.\u003C/li>\n\u003Cli>\u003Cstrong>Coefficiente di dilatazione termica (CTE):\u003C/strong> Sull'asse Z, l'FR-4 standard si espande di circa $50\\text{--}70\\text{ ppm/}^\\circ\\text{C}$ sotto $T_g$, salendo a $250\\text{--}300\\text{ ppm/}^\\circ\\text{C}$ oltre $T_g$.\u003C/li>\n\u003Cli>\u003Cstrong>Parametri meccanici:\u003C/strong> Densita tipica di \u003Cstrong>$1,85\\text{ g/cm}^3$\u003C/strong>, modulo elastico di \u003Cstrong>22--24 GPa\u003C/strong> e conducibilita termica modesta di \u003Cstrong>$0,25\\text{--}0,35\\text{ W/m}\\cdot\\text{K}$\u003C/strong>.\u003C/li>\n\u003C/ul>\n\u003Cdiv data-component=\"BlogQuickQuoteInline\">\u003C/div>\n\n\u003Ch2 id=\"cos39e-l39fr-4-composizione-e-gradi\" data-anchor-en=\"what-is-fr-4-composition-and-grades\">Cos'e l'FR-4? Composizione e gradi\u003C/h2>\n\u003Cp>Il termine \u003Cstrong>materiale PCB FR4\u003C/strong> descrive una struttura composita che unisce:\u003C/p>\n\u003Col>\n\u003Cli>\u003Cstrong>Tessuto in fibra di vetro:\u003C/strong> Fili in vetro E tessuti in stili standard (106, 1080, 2116, 7628) che conferiscono resistenza meccanica e stabilita dimensionale.\u003C/li>\n\u003Cli>\u003Cstrong>Matrice epossidica termoindurente:\u003C/strong> Arricchita con ritardanti di fiamma alogenati o privi di alogeni per isolamento elettrico e adesione del rame.\u003C/li>\n\u003C/ol>\n\u003Ch2 id=\"scheda-tecnica-delle-proprieta-del-materiale-fr4\" data-anchor-en=\"common-fr-4-grades-in-industry\">Scheda tecnica delle proprieta del materiale FR4\u003C/h2>\n\u003Ctable>\n\u003Cthead>\n\u003Ctr>\n\u003Cth>Proprieta\u003C/th>\n\u003Cth>Metodo di prova (IPC-TM-650)\u003C/th>\n\u003Cth>FR-4 standard (Mid-Tg)\u003C/th>\n\u003Cth>FR-4 High-Tg\u003C/th>\n\u003Cth>Unita tipica\u003C/th>\n\u003C/tr>\n\u003C/thead>\n\u003Ctbody>\u003Ctr>\n\u003Ctd>Glass Transition Temp ($T_g$)\u003C/td>\n\u003Ctd>2.4.24 (DSC)\u003C/td>\n\u003Ctd>135 - 150 °C\u003C/td>\n\u003Ctd>170 - 180 °C\u003C/td>\n\u003Ctd>°C\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Decomposition Temp ($T_d$)\u003C/td>\n\u003Ctd>2.4.24.6 (TGA 5% loss)\u003C/td>\n\u003Ctd>310 - 325 °C\u003C/td>\n\u003Ctd>340 - 355 °C\u003C/td>\n\u003Ctd>°C\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Time to Delamination (T260)\u003C/td>\n\u003Ctd>2.4.24.1 (TMA)\u003C/td>\n\u003Ctd>5 - 15 min\u003C/td>\n\u003Ctd>30 - 60+ min\u003C/td>\n\u003Ctd>min\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Time to Delamination (T288)\u003C/td>\n\u003Ctd>2.4.24.1 (TMA)\u003C/td>\n\u003Ctd>0 - 2 min\u003C/td>\n\u003Ctd>10 - 30 min\u003C/td>\n\u003Ctd>min\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Z-Axis CTE (Below $T_g$)\u003C/td>\n\u003Ctd>2.4.24 (TMA)\u003C/td>\n\u003Ctd>50 - 70\u003C/td>\n\u003Ctd>40 - 50\u003C/td>\n\u003Ctd>ppm/°C\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Z-Axis CTE (Above $T_g$)\u003C/td>\n\u003Ctd>2.4.24 (TMA)\u003C/td>\n\u003Ctd>250 - 300\u003C/td>\n\u003Ctd>220 - 260\u003C/td>\n\u003Ctd>ppm/°C\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Z-Axis Expansion (50-260°C)\u003C/td>\n\u003Ctd>2.4.24 (TMA)\u003C/td>\n\u003Ctd>4.0 - 5.5%\u003C/td>\n\u003Ctd>2.3 - 3.2%\u003C/td>\n\u003Ctd>%\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Dielectric Constant ($D_k$, 1 GHz)\u003C/td>\n\u003Ctd>2.5.5.9\u003C/td>\n\u003Ctd>4.3 - 4.6\u003C/td>\n\u003Ctd>4.2 - 4.5\u003C/td>\n\u003Ctd>-\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Loss Tangent ($D_f$, 1 GHz)\u003C/td>\n\u003Ctd>2.5.5.9\u003C/td>\n\u003Ctd>0.016 - 0.022\u003C/td>\n\u003Ctd>0.012 - 0.018\u003C/td>\n\u003Ctd>-\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Volume Resistivity\u003C/td>\n\u003Ctd>2.5.17\u003C/td>\n\u003Ctd>10^8 - 10^9\u003C/td>\n\u003Ctd>10^8 - 10^9\u003C/td>\n\u003Ctd>MΩ·cm\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Surface Resistivity\u003C/td>\n\u003Ctd>2.5.17\u003C/td>\n\u003Ctd>10^7 - 10^8\u003C/td>\n\u003Ctd>10^7 - 10^8\u003C/td>\n\u003Ctd>MΩ\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Dielectric Breakdown\u003C/td>\n\u003Ctd>2.5.6\u003C/td>\n\u003Ctd>> 40\u003C/td>\n\u003Ctd>> 45\u003C/td>\n\u003Ctd>kV\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Flexural Strength (Lengthwise)\u003C/td>\n\u003Ctd>2.4.4\u003C/td>\n\u003Ctd>> 450\u003C/td>\n\u003Ctd>> 500\u003C/td>\n\u003Ctd>MPa\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Peel Strength (1 oz copper)\u003C/td>\n\u003Ctd>2.4.8\u003C/td>\n\u003Ctd>1.4 - 1.8 (8 - 10)\u003C/td>\n\u003Ctd>1.4 - 1.8 (8 - 10)\u003C/td>\n\u003Ctd>N/mm (lb/in)\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Moisture Absorption\u003C/td>\n\u003Ctd>2.6.2.1\u003C/td>\n\u003Ctd>0.15 - 0.25\u003C/td>\n\u003Ctd>0.10 - 0.18\u003C/td>\n\u003Ctd>%\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Thermal Conductivity\u003C/td>\n\u003Ctd>ASTM E1461\u003C/td>\n\u003Ctd>0.25 - 0.35\u003C/td>\n\u003Ctd>0.30 - 0.40\u003C/td>\n\u003Ctd>W/m·K\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd>Flammability Rating\u003C/td>\n\u003Ctd>UL 94\u003C/td>\n\u003Ctd>V-0\u003C/td>\n\u003Ctd>V-0\u003C/td>\n\u003Ctd>Class\u003C/td>\n\u003C/tr>\n\u003C/tbody>\u003C/table>\n\u003Ch2 id=\"domande-frequenti-sull39fr-4\" data-anchor-en=\"fr4-material-properties-datasheet-at-a-glance\">Domande frequenti sull'FR-4\u003C/h2>\n\u003Ch3 id=\"qual-e-la-densita-dell39fr4\" data-anchor-en=\"electrical-performance-fr4-dielectric-constant-and-loss\">Qual e la densita dell'FR4?\u003C/h3>\n\u003Cp>La densita nominale del laminato FR-4 polimerizzato e di \u003Cstrong>1,85 g/cm³\u003C/strong>.\u003C/p>\n\u003Ch3 id=\"qual-e-la-costante-dielettrica-dell39fr-4-a-1-ghz\" data-anchor-en=\"1-dk-variations-by-glass-style\">Qual e la costante dielettrica dell'FR-4 a 1 GHz?\u003C/h3>\n\u003Cp>A 1 GHz, il valore di $Dk$ e comunemente compreso tra \u003Cstrong>4,2 e 4,5\u003C/strong>, diminuendo leggermente a frequenze superiori.\u003C/p>\n\u003Ch3 id=\"quando-scegliere-un-fr-4-high-tg\" data-anchor-en=\"2-high-frequency-attenuation\">Quando scegliere un FR-4 High-Tg?\u003C/h3>\n\u003Cp>L'FR-4 High-Tg ($T_g \\ge 170^\\circ\\text{C}$) e obbligatorio per profili di rifusione senza piombo RoHS, schede multistrato complesse (> 6 strati) e impieghi gravosi.\u003C/p>\n\u003Ch2 id=\"risorse-correlate-e-guide-tecniche\" data-anchor-en=\"thermal-properties-tg-td-and-cte\">Risorse correlate e guide tecniche\u003C/h2>\n\u003Cul>\n\u003Cli>\u003Ca href=\"/it/blog/glass-transition-temperature-tg\">/blog/glass-transition-temperature-tg\u003C/a> - Deep dive into Tg thermal reliability thresholds\u003C/li>\n\u003Cli>\u003Ca href=\"/it/blog/what-is-dielectric-constant\">/blog/what-is-dielectric-constant\u003C/a> - Dielectric constant fundamentals and impedance control\u003C/li>\n\u003Cli>\u003Ca href=\"/it/materials\">/materials\u003C/a> - Complete substrate material catalog and high-frequency laminates\u003C/li>\n\u003Cli>\u003Ca href=\"/it/pcb\">/pcb\u003C/a> - Full multilayer rigid PCB fabrication specifications and tolerances\u003C/li>\n\u003C/ul>\n\n\u003Csection class=\"related-links\" aria-label=\"Related\">\u003Ch3>Related links\u003C/h3>\u003Cul>\u003Cli>\u003Ca href=\"/it/blog/glass-transition-temperature-tg\">/blog/glass-transition-temperature-tg\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"/it/blog/what-is-dielectric-constant\">/blog/what-is-dielectric-constant\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"/it/materials\">/materials\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"/it/pcb\">/pcb\u003C/a>\u003C/li>\u003C/ul>\u003C/section>",[14,15,16,17,18,19,20],"FR4 Material","FR4 Properties","PCB Substrate","FR4 Dielectric Constant","FR4 Tg","Thermal Conductivity","PCB Stackup","fr4-material-properties",{"blog":23,"breadcrumb":32,"faq":46},{"@context":24,"@type":25,"headline":4,"description":5,"image":8,"url":26,"datePublished":6,"dateModified":6,"timeRequired":11,"keywords":27,"articleSection":7,"author":28,"publisher":31},"https://schema.org","BlogPosting","https://aptpcb.com/it/blog/fr4-material-properties","FR4 Material, FR4 Properties, PCB Substrate, FR4 Dielectric Constant, FR4 Tg, Thermal Conductivity, PCB Stackup",{"@type":29,"name":30},"Organization","APTPCB",{"@type":29,"name":30},{"@context":24,"@type":33,"itemListElement":34},"BreadcrumbList",[35,40,44],{"@type":36,"position":37,"name":38,"item":39},"ListItem",1,"Home","https://aptpcb.com/",{"@type":36,"position":41,"name":42,"item":43},2,"Blog","https://aptpcb.com/it/blog",{"@type":36,"position":45,"name":21,"item":26},3,null,{"pcbManufacturingColumns":48,"capabilityColumns":172,"resourceColumns":208,"pcbaColumns":252},[49,97,126,155],{"heading":50,"links":51},"Famiglie di prodotti PCB",[52,55,58,61,64,67,70,73,76,79,82,85,88,91,94],{"label":53,"path":54},"PCB FR-4","/pcb/fr4-pcb",{"label":56,"path":57},"PCB ad alta velocità","/pcb/high-speed-pcb",{"label":59,"path":60},"PCB multistrato","/pcb/multilayer-pcb",{"label":62,"path":63},"PCB HDI","/pcb/hdi-pcb",{"label":65,"path":66},"PCB flessibile","/pcb/flex-pcb",{"label":68,"path":69},"PCB rigid-flex","/pcb/rigid-flex-pcb",{"label":71,"path":72},"PCB ceramico","/pcb/ceramic-pcb",{"label":74,"path":75},"PCB rame spesso","/pcb/heavy-copper-pcb",{"label":77,"path":78},"PCB alta dissipazione","/pcb/high-thermal-pcb",{"label":80,"path":81},"PCB antenna","/pcb/antenna-pcb",{"label":83,"path":84},"PCB alta frequenza","/pcb/high-frequency-pcb",{"label":86,"path":87},"PCB microonde","/pcb/microwave-pcb",{"label":89,"path":90},"PCB a nucleo metallico","/pcb/metal-core-pcb",{"label":92,"path":93},"PCB High-Tg","/pcb/high-tg-pcb",{"label":95,"path":96},"PCB backplane","/pcb/backplane-pcb",{"sections":98},[99],{"heading":100,"links":101},"RF & materiali",[102,105,108,111,114,117,120,123],{"label":103,"path":104},"PCB Rogers","/materials/rf-rogers",{"label":106,"path":107},"Taconic PCB","/materials/taconic-pcb",{"label":109,"path":110},"Teflon PCB","/materials/teflon-pcb",{"label":112,"path":113},"Arlon PCB","/materials/arlon-pcb",{"label":115,"path":116},"Megtron PCB","/materials/megtron-pcb",{"label":118,"path":119},"ISOLA PCB","/materials/isola-pcb",{"label":121,"path":122},"FR-4 Spread Glass","/materials/spread-glass-fr4",{"label":124,"path":125},"Stackup a impedenza controllata","/pcb/pcb-stack-up",{"sections":127},[128],{"heading":129,"links":130},"Produzione / stackup",[131,134,137,140,143,146,149,152],{"label":132,"path":133},"Prototipi quickturn","/pcb/quick-turn-pcb",{"label":135,"path":136},"NPI e piccoli lotti (PCB)","/pcb/npi-small-batch-pcb-manufacturing",{"label":138,"path":139},"Produzione ad alto volume","/pcb/mass-production-pcb-manufacturing",{"label":141,"path":142},"PCB ad alto numero di strati","/pcb/high-layer-count-pcb",{"label":144,"path":145},"Processo di fabbricazione PCB","/pcb/pcb-fabrication-process",{"label":147,"path":148},"Fabbricazione PCB avanzata","/pcb/advanced-pcb-manufacturing",{"label":150,"path":151},"Fabbricazione PCB speciale","/pcb/special-pcb-manufacturing",{"label":153,"path":154},"Struttura laminata multistrato","/pcb/multilayer-pcb-lamination-services",{"heading":156,"links":157},"Specialità & risorse",[158,161,164,166,169],{"label":159,"path":160},"Finiture superficiali PCB (ENIG / ENEPIG / HASL / OSP / Immersion)","/pcb/pcb-surface-finishes",{"label":162,"path":163},"Foratura & vias (Blind / Buried / Via-in-Pad / Backdrill / Half Hole)","/pcb/pcb-drilling",{"label":165,"path":125},"Stackup PCB (Standard / High-Layer / Flex / Rigid-Flex / Aluminum)",{"label":167,"path":168},"Profilatura (Milling / V-Scoring / Depaneling)","/pcb/pcb-profiling",{"label":170,"path":171},"Qualità & ispezione (AOI + X-Ray / Flying Probe / PCB DFM Check)","/pcb/pcb-quality",[173,178,183,188,193,198,203],{"links":174},[175],{"label":176,"path":177},"Capacità PCB rigido","/capabilities/rigid-pcb",{"links":179},[180],{"label":181,"path":182},"Capacità PCB rigid-flex","/capabilities/rigid-flex-pcb",{"links":184},[185],{"label":186,"path":187},"Capacità PCB flessibile","/capabilities/flex-pcb",{"links":189},[190],{"label":191,"path":192},"Capacità PCB HDI","/capabilities/hdi-pcb",{"links":194},[195],{"label":196,"path":197},"Capacità PCB metallico","/capabilities/metal-pcb",{"links":199},[200],{"label":201,"path":202},"Capacità PCB ceramico","/capabilities/ceramic-pcb",{"links":204},[205],{"label":206,"path":207},"Capacità PCB rame pesante","/capabilities/heavy-copper-pcb",[209,220,244],{"heading":210,"links":211},"Download",[212,215,218],{"label":213,"path":214},"Datasheet materiali / note di processo","/resources/downloads-materials",{"label":216,"path":217},"Linee guida DFM PCB","/resources/dfm-guidelines",{"label":153,"path":219},"/pcb/multi-layer-laminated-structure",{"heading":221,"links":222},"Strumenti",[223,226,229,232,235,238,241],{"label":224,"path":225},"Viewer Gerber","/tools/gerber-viewer",{"label":227,"path":228},"Viewer PCB","/tools/pcb-viewer",{"label":230,"path":231},"Viewer BOM","/tools/bom-viewer",{"label":233,"path":234},"Viewer 3D","/tools/3d-viewer",{"label":236,"path":237},"Simulatore di circuiti","/tools/circuit-simulator",{"label":239,"path":240},"Calcolatore di impedenza","/tools/impedance-calculator",{"label":242,"path":243},"Calcolatore di larghezza pista","/tools/trace-width-calculator",{"heading":245,"links":246},"FAQ & blog",[247,250],{"label":248,"path":249},"FAQ","/resources/faq",{"label":42,"path":251},"/blog",[253,283,307,340],{"heading":254,"links":255},"Servizi principali",[256,259,262,265,268,271,274,277,280],{"label":257,"path":258},"Assemblaggio PCB turnkey","/pcba/turnkey-assembly",{"label":260,"path":261},"Assemblaggio PCB NPI e piccoli lotti","/pcba/npi-assembly",{"label":263,"path":264},"Assemblaggio PCB produzione di massa","/pcba/mass-production",{"label":266,"path":267},"Assemblaggio PCB flex e rigid-flex","/pcba/flex-rigid-flex",{"label":269,"path":270},"Assemblaggio SMT e THT","/pcba/smt-tht",{"label":272,"path":273},"Assemblaggio PCB BGA","/pcba/bga-qfn-fine-pitch",{"label":275,"path":276},"Componenti & gestione BOM","/pcba/components-bom",{"label":278,"path":279},"Assemblaggio box build","/pcba/box-build-assembly",{"label":281,"path":282},"Test & qualità assemblaggio PCB","/pcba/testing-quality",{"heading":284,"links":285},"Servizi di supporto",[286,289,292,295,298,301,304],{"label":287,"path":288},"Tutti i punti di supporto","/pcba/support-services",{"label":290,"path":291},"Laboratorio stencil","/pcba/pcb-stencil",{"label":293,"path":294},"Sourcing componenti","/pcba/component-sourcing",{"label":296,"path":297},"Programmazione IC","/pcba/ic-programming",{"label":299,"path":300},"Conformal coating","/pcba/pcb-conformal-coating",{"label":302,"path":303},"Saldatura selettiva","/pcba/pcb-selective-soldering",{"label":305,"path":306},"Reballing BGA","/pcba/bga-reballing",{"heading":308,"links":309},"Qualità & test",[310,313,316,319,322,325,328,331,334,337],{"label":311,"path":312},"Ispezione qualità","/pcba/quality-system",{"label":314,"path":315},"Ispezione primo articolo (FAI)","/pcba/first-article-inspection",{"label":317,"path":318},"Ispezione pasta saldante (SPI)","/pcba/spi-inspection",{"label":320,"path":321},"Ispezione ottica AOI","/pcba/aoi-inspection",{"label":323,"path":324},"Ispezione raggi X / CT","/pcba/xray-inspection",{"label":326,"path":327},"Test in-circuit (ICT)","/pcba/ict-test",{"label":329,"path":330},"Test flying probe","/pcba/flying-probe-testing",{"label":332,"path":333},"Test funzionale (FCT)","/pcba/fct-test",{"label":335,"path":336},"Ispezione finale & imballaggio","/pcba/final-quality-inspection",{"label":338,"path":339},"Controllo qualità in ingresso","/pcba/incoming-quality-control",{"heading":341,"linkClass":342,"links":343},"Applicazioni di settore (entry)","text-nowrap",[344,347,350,353,356,359,362,365,368,371,374],{"label":345,"path":346},"Server / data center","/industries/server-data-center-pcb",{"label":348,"path":349},"Automotive / EV","/industries/automotive-electronics-pcb",{"label":351,"path":352},"Medicale","/industries/medical-pcb",{"label":354,"path":355},"Telecom / 5G","/industries/communication-equipment-pcb",{"label":357,"path":358},"Aerospace & defense","/industries/aerospace-defense-pcb",{"label":360,"path":361},"Droni / UAV","/industries/drone-uav-pcb",{"label":363,"path":364},"Controllo industriale & automazione","/industries/industrial-control-pcb",{"label":366,"path":367},"Energia & nuove energie","/industries/power-energy-pcb",{"label":369,"path":370},"Robotica & automazione","/industries/robotics-pcb",{"label":372,"path":373},"Sicurezza / apparati di sicurezza","/industries/security-equipment-pcb",{"label":375,"path":376},"Panoramica del settore PCB →","/pcb-industry-solutions",1791587003702]