FR-4 consists of woven fiberglass and a flame-retardant epoxy resin. It’s often used as an insulator in dry or humid conditions. Because it offers consistently excellent mechanical and electrical performance, it’s considered a generalist material that works for various applications.
The FR in FR-4 stands for “flame retardant,” while the 4 signifies that it’s a glass epoxy.
High mechanical properties: FR-4 epoxy sheet parts has high mechanical strength and can withstand large external forces without deformation or cracking.
Stable electrical performance: At high temperatures, the electrical performance of FR-4 epoxy sheet parts is still stable, which can meet the high requirements of electrical and electronic fields for insulation materials.
Good heat resistance and moisture resistance: FR-4 epoxy sheet parts can maintain its performance stability in high temperature and humid environment. And it is not prone to aging or deterioration.
Outstanding flame retardant performance: FR-4 epoxy sheet parts have excellent flame retardant performance, which can meet international standards such as UL94V-0 and effectively prevent the occurrence of fire accidents.
There are many processing methods for FR-4 epoxy sheet, mainly including the following:
Drilling: This is a common processing method in PCB circuit board factories. It is used to make test fixtures or post-processing.
CNC or numerical control processing: The method is used to process flat and inclined parts. And it has the characteristics of flexibility and speed.
Slitting: Cut the board into small pieces through a cutting machine. It is suitable for general processing needs.
Milling machine/lathe: Mainly used for hardware parts processing. It is suitable for thicker epoxy boards.
Engraving machine: Design and layout through a computer-controlled engraving machine. And it is suitable for parts processing of complex shapes.
Choose appropriate tools and processing parameters: Due to the high hardness and dust generation of FR-4 epoxy sheet, it is necessary to select appropriate tools and processing parameters to improve processing efficiency and quality.
Equipped with an efficient dust removal system: During the processing, a large amount of fine dust will be generated, which poses a threat to the health of operators and the normal operation of processing equipment. Therefore, it is necessary to equip an efficient dust removal system to remove dust in time.
Pay attention to surface treatment: The surface of FR-4 epoxy sheet often needs a series of treatments, such as deburring, smooth surface and coating protective layer, which can improve its surface quality and corrosion resistance.
Control temperature and humidity: During the processing, the temperature and humidity should be controlled as much as possible to reduce the deformation caused by thermal expansion and contraction. Appropriate temperature control measures can improve processing accuracy and reduce errors caused by thermal expansion of materials.
1. Electronic and electrical industry
Printed circuit board (PCB): FR-4 epoxy sheet is one of the main materials for making PCB. It is used to make the basic laminate of the circuit board and provide support for circuit layout and connection.
Insulating structural parts: In motors and electrical equipment, FR-4 epoxy sheet parts are often used as insulating structural parts, such as insulating gaskets, insulating rods, etc., to ensure the safe operation of the equipment.
2. Mechanical equipment industry
Mechanical parts: FR-4 epoxy sheet has high mechanical strength. So it can be used to make some mechanical parts, such as planetary wheels, gears, etc., to meet the operation requirements of mechanical equipment.
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