In recent years, due to the development of electronic product installation technology and PCB technology, Fr4 PCB Double Layer Board products with high Ts have appeared again.
Fr-4 epoxy glass fiber cloth substrate is a kind of substrate with epoxy resin as adhesive and electronic glass fiber cloth as reinforcing material. Its bonding sheet and inner core thin copper clad plate are important substrates for making multilayer printed circuit boards.
The mechanical properties, dimensional stability, impact resistance and moisture resistance of glass fiber epoxy substrate are better than that of paper substrate. Its excellent electrical performance, high operating temperature, its own performance by the environment little impact. In the processing technology, compared with other resin glass fiber cloth substrate has the very big superiority. This kind of product is mainly used for double-sided PCB, the dosage is very large.
-It is generally composed of special polymer filled with special ceramics, with small thermal resistance, excellent viscoelastic properties, thermal aging resistance and mechanical and thermal stress tolerance. The metal base is the supporting member of the Fr4 PCB Double Layer Board, which requires high thermal conductivity.
-Generally, it is aluminum plate, but copper plate can also be used (copper plate can provide better thermal conductivity), which is suitable for drilling, punching, cutting and other conventional mechanical processing.
-The Fr-4 material can be a structure mainly composed of fiberglass weaved to a thin and cloth-looking sheet. It is the fiberglass that gives the Fr-4 popularity as a solid base for manufacturing of rigid circuit boards. It is enclosed with a fire-resistant epoxy resin, and it is where the rigidity comes from.
Fr4 PCB Double Layer Board can be widely used for Mobile phone, computer, MP4, DVB, LCD TV, LED, automobile, electromechanical equipment, backlight, connectors, security, military, mobile phone, communications, aviation, home appliances, CNC, medical, digital products, instruments and other high-tech fields.
Number of layers
Minimum. Thickness for inner ayers
(Cu thickness are excluded)
Single/Double layer: 0.008±0.004”
4 layer: 0.01±0.008”
8 layer: 0.01±0.008”
Bow and twist
Outer Cu weight
Inner Cu weight
PTH hole tolerance
NPTH hole tolerance
Minimum hole size
Minimum solder mask clearanace