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Black FR4 sheets are high-performance composite materials widely used in electronics, automotive, and industrial applications. Composed of woven fiberglass fabric impregnated with flame-retardant epoxy resin, these sheets are reinforced with a black-colored surface layer for enhanced aesthetics and UV resistance. The core structure ensures exceptional mechanical strength, thermal stability, and electrical insulation. FR4’s flame resistance (UL94 V-0 rating) and low moisture absorption (<0.1%) make it ideal for demanding environments. Its versatility supports applications such as printed circuit boards (PCBs), enclosures, and insulating components, where durability, safety, and precision are critical.
Composition & Manufacturing Process
Black FR4 sheets are produced through a precision-driven process. First, E-glass fiber fabric is coated with brominated epoxy resin (for flame retardancy) and blended with black pigments or surface-treated for color consistency. The resin-impregnated fabric is layered and subjected to multilayer lamination under high pressure (300–500 psi) and temperature (170–190°C). This cures the epoxy, forming a rigid, homogeneous structure. Post-lamination, sheets are precision-cut, polished, and tested for thickness tolerance (±5%), dielectric strength (>20 kV/mm), and thermal expansion (CTE <14 ppm/°C). Advanced quality control ensures compliance with international standards (IPC-4101, RoHS), guaranteeing reliability for high-frequency and high-temperature applications.
Applications of FR4 Sheets
Electronics: PCBs for consumer devices, telecom equipment, and IoT modules.
Automotive: ECU housings, sensor substrates, and EV battery insulation.
Industrial Machinery: Motor insulation, control panels, and transformer barriers.
Aerospace: Avionics systems and high-reliability circuit boards.
LED Lighting: Heat-resistant bases and driver boards.
Medical Devices: Diagnostic equipment and sterilizable components.
Renewable Energy: Solar inverters and wind turbine control circuits.
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