FR4 GLASS FIBER BOARD CNC MACHINING
High-Performance FR4 (Flame Retardant 4) Glass Fiber Laminate CNC Machining - Precision Parts for PCB, Electronics, Automotive and Industrial Applications
PROTOREV is a professional FR4 glass fiber board CNC machining manufacturer, serving global clients in the PCB, electronics, automotive, aerospace, and industrial equipment sectors. We specialize in high-precision machining of FR4 (Flame Retardant 4) glass fiber laminates - delivering tight tolerances, clean edges, and excellent surface finish from rapid prototype to mass production.
FR4 is the industry-standard glass fiber reinforced epoxy laminate, made from woven fiberglass cloth impregnated with brominated epoxy resin. It offers an outstanding combination of electrical insulation, mechanical strength, flame retardancy (UL 94V-0), and dimensional stability - making it the first choice for PCB substrates, electrical insulation components, and high-performance structural parts across all major industries.
Why Choose FR4 Glass Fiber Board for CNC Machining
Superior Flame Retardancy (UL 94V-0)
FR4 achieves UL 94V-0 flame rating - self-extinguishing within 10 seconds, meeting strict fire safety standards for PCB and electronics applications.
Excellent Electrical Insulation
High dielectric strength (40 kV/mm) and stable dielectric constant (Dk 4.0-4.8) - ideal for high-frequency PCBs, insulation barriers, and high-voltage components.
High Mechanical Strength
Outstanding flexural strength (415-510 MPa) and tensile strength (310-400 MPa) - suitable for structural parts, precision jigs, and load-bearing components.
Very Low Water Absorption
Water absorption <= 0.10% (after 24h immersion) - maintains excellent insulation performance in humid, outdoor, and marine environments.
High Thermal Stability (High Tg Options)
Glass transition temperature (Tg) ranging from 130 to 180 degree C - High Tg FR4 supports lead-free soldering and high-power electronics applications.
Chemical & Solvent Resistance
Resistant to most acids, alkalis, and industrial solvents - performs reliably in harsh chemical and industrial environments. Halogen-free grades available for RoHS compliance.
FR4 Glass Fiber Board - Technical Properties
- Electrical Insulation: Dielectric strength 40 kV/mm - provides reliable high-voltage insulation for PCBs, transformers, and switchgear components.
- Dielectric Constant (Dk): 4.0 to 4.8 at 1MHz - stable signal transmission for high-frequency and RF circuit applications.
- Flame Retardancy: UL 94V-0 certified - self-extinguishing, meets strict fire safety requirements for all electronics and electrical equipment.
- High Glass Transition Temp (Tg): 130 to 180 degree C (by grade) - supports lead-free soldering (260 degree C peak) and high-power applications.
- Dimensional Stability: Low thermal expansion (CTE: 10-16 ppm/degree C in X/Y axis) - maintains precision in multi-layer and HDI PCB assemblies.
FR4 Glass Fiber Board - Full Specification
| Property | FR4 Glass Fiber Board (NEMA LI 1 / IEC 60893) |
|---|---|
| Standard | NEMA LI 1, IEC 60893, IPC-4101 |
| Base Material | Woven fiberglass cloth + brominated epoxy resin |
| Color | Natural (light yellow / greenish) |
| Flame Retardancy | UL 94V-0 (self-extinguishing) |
| Glass Transition Temp (Tg) | 130 to 180 degree C (Standard: 130-140; High Tg: >=170) |
| Dielectric Strength | 40 kV/mm |
| Dielectric Constant (Dk) at 1MHz | 4.0 to 4.8 |
| Flexural Strength | 415 to 510 MPa |
| Tensile Strength | 310 to 400 MPa |
| Water Absorption (24h) | <= 0.10% |
| Density | 1.85 to 1.90 g/cm3 |
| Operating Temperature | -40 to +130 degree C (Standard); up to +150 degree C (High Tg) |
| Available Thickness | 0.2mm to 50mm+ (custom on request) |
| Sheet Size | 1020x1220mm / 1220x2440mm (standard); custom cut-to-size available |
| Special Grades Available | High Tg FR4, Low CTE FR4, Halogen-Free FR4 |
How Does CNC Machining FR4 Glass Fiber Board Work
1CAD Design & Toolpath Programming
Your CAD drawings and Gerber/PCB files are converted into optimized CNC toolpaths - accounting for the abrasive glass fiber content and ensuring clean edge quality and tight tolerances.
2Tool Selection & Workpiece Setup
Diamond-coated or carbide tools are selected to resist the highly abrasive fiberglass reinforcement. The workpiece is firmly clamped with a backing support plate to prevent delamination and edge chipping.
3Precision Milling, Drilling & Routing
CNC milling, drilling, routing, and beveling operations are performed at optimized spindle speeds with coolant or air blast - producing precise holes, slots, and profiles with minimal burr and zero delamination.
4Deburring, Inspection & Packaging
All edges are precision-deburred, parts are dimensionally and visually inspected against your drawings, then ESD-safe packaged for secure domestic or international shipment.
Machining Tolerances & Capabilities
| Specification | PROTOREV Capability |
|---|---|
| CNC Machining Tolerance | +/-0.05mm (+/-0.002") standard; +/-0.01mm (+/-0.0004") achievable for precision fitting parts |
| Minimum Wall Thickness | 0.8mm (recommended); 0.5mm achievable with optimized tooling and setup |
| Minimum Hole Diameter | 0.5mm (drilling); 0.8mm (through-hole with clean exit) |
| Surface Finish (as machined) | Ra 0.8 to 3.2 um; edge deburring and fine polishing available |
| Maximum Part Size | 1000 x 600mm (dependent on machine worktable); larger sizes available via modular machining |
| Material Thickness Range | 0.2mm to 50mm (single layer); multilayer lamination available for thicker parts |
| Typical Lead Time | 3 to 7 working days for prototypes; 7 to 15 days for production batches |
| File Formats Accepted | PDF, DWG, DXF, STEP, IGES, SolidWorks, AutoCAD, Gerber (for PCB-related parts) |
| Special Services | Beveling, countersinking, threaded hole machining, silk-screen marking, conformal coating |
Common Applications for FR4 Glass Fiber Board CNC Parts
- PCB & Electronics Manufacturing: Test fixtures, PCB alignment jigs, insulation spacers, and component mounting plates for SMT and through-hole assembly.
- Automotive Electronics: ADAS sensor brackets, power distribution module insulation, infotainment system mounting plates, and EV battery insulation components.
- Aerospace & Defense: Avionics mounting plates, radar and communication equipment insulation, and ruggedized electronic enclosures.
- Industrial Automation: PLC mounting panels, robotic end-effector insulation plates, test and burn-in fixtures, and wear-resistant non-conductive structural parts.
- Power & Energy: Transformer insulation spacers, solar inverter mounting plates, wind power control system insulation, and EV charging station components.
- Medical Electronics: Diagnostic equipment insulation parts, imaging system mounting plates, and patient-safe non-conductive enclosures.
CNC Machining Tips for FR4 Glass Fiber Board
Use Diamond-Coated or Premium Carbide Tools: The woven fiberglass reinforcement in FR4 is extremely abrasive. Standard HSS tools wear rapidly. Use diamond-coated end mills and drill bits for clean cuts, burr-free edges, and 3x to 5x longer tool life.
Optimize Spindle Speed & Feed Rate: Recommended spindle speed for FR4 is 10,000-18,000 RPM for milling, with moderate-to-fast feed rates. Excessive speed generates heat that softens the epoxy matrix; too-slow feed causes burning and poor edge quality. Use peck drilling for deep holes.
Use Coolant or High-Volume Air Blast: Continuous air blast or water-soluble coolant clears glass fiber dust and suppresses heat buildup. This prevents delamination at the cut edge, reduces tool wear, and maintains dimensional accuracy.
Always Use a Backing Support Plate: FR4 is prone to delamination and exit-edge chipping. Always place a sacrificial backing board underneath the workpiece when drilling or through-cutting to support the bottom edge and prevent tear-out.
Dust Extraction & PPE (Critical): Machining FR4 generates fine glass fiber and cured epoxy dust, which is hazardous if inhaled. Use industrial dust extraction at the cutting point and wear appropriate PPE (goggles, nitrile gloves, P95/N95 respirator) in a well-ventilated workspace.
Why Choose PROTOREV for FR4 Glass Fiber Board CNC Machining
- Specialized in FR4 & Glass-Fiber Composites: Extensive hands-on experience machining FR4, G10, G11, and other glass-fiber laminates - we understand material behavior, optimal tooling, and cutting strategies for every grade.
- Diamond-Coated Tooling & Optimized Feeds: Our CNC machines are equipped with diamond-coated and premium carbide tooling specifically for abrasive glass-fiber composites - delivering clean edges, tight tolerances, and superior surface finish.
- Full In-House Production & Finishing: From CNC milling, drilling, routing, beveling, and tapping to silk-screen marking and conformal coating - complete production in-house with no outsourcing delays.
- Strict Dimensional & Visual Inspection: Every batch is dimensionally inspected against your drawings using CMM and precision measuring tools. We provide inspection reports and can issue first-article inspection (FAI) reports on request.
- Support for All FR4 Grades: We machine Standard FR4 (Tg 130-140), High Tg FR4 (Tg >=170), Low CTE FR4, and Halogen-Free FR4 - helping you select the optimal grade for your application and budget.
Our Advantages
One-stop Service
Our strong in-house production capabilities ensure you receive exactly the finished part you need.
Quick Response
24 hours prompt response, 4 to 24 hours for quotation, 5 to 7 days for prototype.
Quality Assurance
Complete testing equipment; Issue test report for each batch of parts before shipment.
Professional Service
Flexible transportation (DHL, FedEx, UPS, air or sea); Production progress updated at any time.