{"product_id":"epoxy-flat-plate-sheet-fr4-fiberglass-sheet","title":"Epoxy Flat Plate Sheet FR-4 Thick=1~8mm Green FR-4 Epoxy Plate Fiberglass Sheet","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eFR-4 Epoxy Fiberglass Flat Plate — Electrically Insulating, Flame-Retardant Sheet for DIY and Industrial Use\u003c\/h2\u003e\n    \u003cp\u003eWhen a project demands a rigid, electrically insulating substrate that won't warp under heat or crack under mechanical stress, most general-purpose plastics fall short. Makers, electronics hobbyists, and fabricators who need a reliable dielectric barrier turn to FR-4 epoxy fiberglass sheet — a material engineered specifically for demanding electrical and structural applications.\u003c\/p\u003e\n    \u003cp\u003eThis FR-4 epoxy fiberglass flat plate is composed of woven fiberglass cloth bonded with an epoxy resin system, resulting in a dense, dimensionally stable laminate. Plates are available in widths of 100 mm (~3.94 in) and 150 mm (~5.91 in), lengths of 100 mm (~3.94 in) and 200 mm (~7.87 in), and thicknesses ranging from 1 mm to 8 mm (~0.04 in to ~0.31 in). The characteristic green solder-mask color is standard for FR-4 grade material.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include custom PCB spacers and standoffs, electrical insulation panels in control cabinets, jig and fixture plates for electronics assembly, and structural brackets in low-voltage enclosures where dielectric strength is required alongside mechanical rigidity.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e⚡\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility Note:\u003c\/strong\u003e FR-4 sheet is compatible with standard CNC routing, drilling, and laser scoring. It is not recommended for continuous exposure to strong alkalis or concentrated acids. Verify thickness tolerance requirements before ordering for precision-fit applications.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These FR-4 Epoxy Fiberglass Flat Plates\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔥\u003c\/span\u003e \u003cstrong\u003eFlame-Retardant (UL 94 V-0 Grade):\u003c\/strong\u003e FR-4 designation indicates the material meets UL 94 V-0 flame-retardant classification, self-extinguishing when the ignition source is removed — suitable for use inside electrical enclosures.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e \u003cstrong\u003eHigh Dielectric Strength:\u003c\/strong\u003e The epoxy-fiberglass matrix provides strong electrical insulation, making these plates effective as bus bar separators, relay mounting bases, and insulating spacers in low-to-medium voltage assemblies.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eMultiple Thickness Options (1–8 mm):\u003c\/strong\u003e Select from 1, 1.5, 2, 2.5, 3, 4, 5, 6, or 8 mm thickness to match your structural or insulation requirements — thinner sheets for lightweight spacers, thicker plates for load-bearing fixtures.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eMachinable and Drillable:\u003c\/strong\u003e FR-4 can be cut with standard carbide tooling, drilled cleanly without delamination when using appropriate feed rates, and tapped for small fasteners — enabling custom shapes without specialist equipment.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eDimensionally Stable Under Heat:\u003c\/strong\u003e The glass transition temperature (Tg) of standard FR-4 is typically 130–140 °C, maintaining shape and insulating properties across the temperature range of most electronics and light industrial environments.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🧱\u003c\/span\u003e \u003cstrong\u003eRigid, Low-Moisture-Absorption Construction:\u003c\/strong\u003e Unlike many thermoplastics, FR-4 absorbs minimal moisture, preserving its dielectric properties and mechanical stiffness even in humid workshop or enclosure environments.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — FR-4 Epoxy Fiberglass Flat Plate\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eFR-4 Epoxy Fiberglass Laminate (woven glass cloth + epoxy resin)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eGreen (standard FR-4 grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWidth Options\u003c\/th\u003e\n\u003ctd\u003e100 mm (~3.94 in) \/ 150 mm (~5.91 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLength Options\u003c\/th\u003e\n\u003ctd\u003e100 mm (~3.94 in) \/ 200 mm (~7.87 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eThickness Options\u003c\/th\u003e\n\u003ctd\u003e1 \/ 1.5 \/ 2 \/ 2.5 \/ 3 \/ 4 \/ 5 \/ 6 \/ 8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFlame Rating\u003c\/th\u003e\n\u003ctd\u003eUL 94 V-0 (self-extinguishing)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eGlass Transition Temp (Tg)\u003c\/th\u003e\n\u003ctd\u003eTypically 130–140 °C (standard FR-4)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eDielectric Strength\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eSmooth laminate, green solder-mask appearance\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003eSee variant options (1–10 pcs depending on thickness)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMachinability\u003c\/th\u003e\n\u003ctd\u003eCNC routable, drillable, tappable with carbide tooling\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-faq\"\u003e\n    \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thickness should I choose for an electrical insulation panel?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor light-duty insulation panels inside control cabinets or relay boards, 1–2 mm is typically sufficient. If the panel also needs to bear mechanical load or resist flexing under fastener torque, 3–5 mm provides a better safety margin. For structural mounting plates that also serve as insulators, 6–8 mm is appropriate.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs FR-4 strong enough to use as a structural bracket or jig plate?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFR-4 has a tensile strength typically in the range of 270–310 MPa and a flexural strength of approximately 415–550 MPa, making it suitable for light structural applications such as jig plates, fixture bases, and mounting brackets in electronics assembly environments. It is not a substitute for metal in high-load or impact-prone applications.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill FR-4 resist moisture in a humid environment?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFR-4 has low moisture absorption (typically \u0026lt;0.10% by weight per IPC-4101 standards), which means its dielectric properties and dimensional stability are well-maintained in humid conditions. It is not waterproof for immersion use, but performs reliably in typical workshop, enclosure, and indoor industrial environments.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I cut or drill FR-4 sheet with standard tools?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. FR-4 can be cut with a carbide-tipped router bit, scored and snapped for straight cuts on thinner sheets (1–2 mm), or drilled with standard HSS or carbide drill bits. Use moderate feed rates and avoid overheating the material. A dust mask is recommended when machining, as fiberglass dust is an irritant.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs this the same material used in printed circuit boards (PCBs)?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — FR-4 is the base substrate used in the vast majority of rigid PCBs. These flat plates are the same material without copper cladding, making them useful as bare insulating substrates, spacers, or prototype bases where you need the mechanical and electrical properties of PCB material without the copper layer.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose between the 100 mm and 150 mm width options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eChoose based on the footprint of your application. The 100×100 mm plates suit compact insulation inserts, small jig plates, and PCB-scale spacers. The 150×100 mm and 150×200 mm plates are better for larger relay panels, bus bar separators, or fixture bases that need more surface area. If you need a custom size, these plates can be trimmed down with standard tooling.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the operating temperature range for these FR-4 plates?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStandard FR-4 maintains its mechanical and electrical properties from approximately -50 °C to +130 °C (continuous). Short-term excursions up to the glass transition temperature (~130–140 °C) are tolerable, but sustained exposure above Tg will cause softening and dimensional change. For higher-temperature applications, consider high-Tg FR-4 or alternative laminates.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your Width, Length, and Thickness above, then add to cart.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thickness should I choose for an electrical insulation panel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light-duty insulation panels inside control cabinets or relay boards, 1–2 mm is typically sufficient. If the panel also needs to bear mechanical load or resist flexing under fastener torque, 3–5 mm provides a better safety margin. For structural mounting plates that also serve as insulators, 6–8 mm is appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is FR-4 strong enough to use as a structural bracket or jig plate?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"FR-4 has a tensile strength typically in the range of 270–310 MPa and a flexural strength of approximately 415–550 MPa, making it suitable for light structural applications such as jig plates, fixture bases, and mounting brackets in electronics assembly environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will FR-4 resist moisture in a humid environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"FR-4 has low moisture absorption (typically less than 0.10% by weight), which means its dielectric properties and dimensional stability are well-maintained in humid conditions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I cut or drill FR-4 sheet with standard tools?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. FR-4 can be cut with a carbide-tipped router bit, scored and snapped for straight cuts on thinner sheets, or drilled with standard HSS or carbide drill bits. Use moderate feed rates and avoid overheating the material.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is this the same material used in printed circuit boards (PCBs)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — FR-4 is the base substrate used in the vast majority of rigid PCBs. These flat plates are the same material without copper cladding, making them useful as bare insulating substrates, spacers, or prototype bases.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose between the 100 mm and 150 mm width options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose based on the footprint of your application. The 100×100 mm plates suit compact insulation inserts and small jig plates. The 150 mm wide plates are better for larger relay panels, bus bar separators, or fixture bases that need more surface area.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the operating temperature range for these FR-4 plates?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard FR-4 maintains its mechanical and electrical properties from approximately -50 °C to +130 °C (continuous). Sustained exposure above the glass transition temperature (~130–140 °C) will cause softening and dimensional change.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"100 mm \/ 100 mm \/ 1 mm \u0026 10 pcs","offer_id":52379033501970,"sku":"WXB012993x1","price":36.72,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 1.5 mm \u0026 10 pcs","offer_id":52379033534738,"sku":"WXB012994x1","price":44.25,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 2 mm \u0026 6 pcs","offer_id":52379033567506,"sku":"WXB012995x1","price":43.11,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 2.5 mm \u0026 4 pcs","offer_id":52379033600274,"sku":"WXB012996x1","price":31.69,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 3 mm \u0026 4 pcs","offer_id":52379033633042,"sku":"WXB012997x1","price":43.68,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 4 mm \u0026 2 pcs","offer_id":52379033665810,"sku":"WXB012998x1","price":26.56,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 5 mm \u0026 2 pcs","offer_id":52379033698578,"sku":"WXB012999x1","price":27.49,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 6 mm \u0026 2 pcs","offer_id":52379033731346,"sku":"WXB013000x1","price":36.72,"currency_code":"USD","in_stock":true},{"title":"100 mm \/ 100 mm \/ 8 mm \u0026 1 pcs","offer_id":52379033764114,"sku":"WXB013001x1","price":26.56,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 1 mm \u0026 6 pcs","offer_id":52379033796882,"sku":"WXB013002x1","price":29.13,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 1.5 mm \u0026 4 pcs","offer_id":52379033829650,"sku":"WXB013003x1","price":33.1,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 2 mm \u0026 4 pcs","offer_id":52379033862418,"sku":"WXB013004x1","price":36.72,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 2.5 mm \u0026 4 pcs","offer_id":52379033895186,"sku":"WXB013005x1","price":51.34,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 3 mm \u0026 2 pcs","offer_id":52379033927954,"sku":"WXB013006x1","price":29.13,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 4 mm \u0026 2 pcs","offer_id":52379033960722,"sku":"WXB013007x1","price":36.65,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 5 mm \u0026 2 pcs","offer_id":52379033993490,"sku":"WXB013008x1","price":44.25,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 6 mm \u0026 1 pcs","offer_id":52379034026258,"sku":"WXB013009x1","price":33.29,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 100 mm \/ 8 mm \u0026 1 pcs","offer_id":52379034059026,"sku":"WXB013010x1","price":41.49,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 200 mm \/ 1 mm \u0026 4 pcs","offer_id":52379034091794,"sku":"WXB013011x1","price":29.06,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 200 mm \/ 1.5 mm \u0026 2 pcs","offer_id":52379034124562,"sku":"WXB013012x1","price":34.91,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 200 mm \/ 2 mm \u0026 2 pcs","offer_id":52379034157330,"sku":"WXB013013x1","price":36.72,"currency_code":"USD","in_stock":true},{"title":"150 mm \/ 200 mm \/ 2.5 mm \u0026 2 pcs","offer_id":52379034190098,"sku":"WXB013014x1","price":44.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_6ccec488-c8c6-453e-8a46-2ad9e91e9e47.jpg?v=1781772100","url":"https:\/\/homediyer.com\/de\/products\/epoxy-flat-plate-sheet-fr4-fiberglass-sheet","provider":"HomeDIYer","version":"1.0","type":"link"}