Black FR4 Fiberglass Epoxy Sheet for Battery Encapsulation

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.

Superior Mechanical Strength: High rigidity and dimensional stability ensure reliability in precision PCB and structural applications.

 

Thermal Resistance: Operates seamlessly from -50°C to 150°C with low thermal expansion (CTE <14 ppm/°C), ideal for high-temperature environments.

 

Flame Retardancy: UL94 V-0 certified, self-extinguishing for enhanced safety in electronics and automotive systems.

 

Electrical Insulation: Exceptional dielectric strength (>20 kV/mm) and stable permittivity (ε=4.4–4.8 at 1 MHz), perfect for high-frequency circuits.

 

RoHS/REACH Compliance: Eco-friendly formulation free from hazardous substances.

 

Customizable Fabrication: Compatible with drilling, routing, and surface finishes (e.g., HASL, ENIG) for versatile design integration.

 

 

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.