4 Layer Pcb

Compared with the conventional multilayer and double sided board production process, the multilayer board adds several unique process steps. In most of the processes, some process parameters, equipment accuracy and complexity are different.
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Product Details

PCB Knowledge:

The 4 layer PCB board refers to the circuit printed circuit board PCB made of 4 layers of glass fiber, which can reduce the cost of the PCB.

The four-layer board is pressed on the basis of the double-panel (two-layer board). When pressing, the PP and copper foil are added on both sides of the double-panel, and then pressed into a multi-layer board after high temperature and high pressure. To put it simply, the four-layer board has an inner layer, and in the process, some lines are etched through the inner layer, and are pressed. The double layers PCB panel is to cut the sheet directly and then drill it.

Although the four-layer board is obtained by viewing the cut surface of the PCB board, this method is actually difficult, and few people have such eyesight. However, by observing the guide holes, it is possible to identify the four-layer board. If the front and back sides of the PCB board can find the same guide hole, or the main board or the display card is facing the light source, if the position of the guide hole is not transparent, it is a four-layer board.

Process of pcb manufacturing:


Our Factory:




Our Company is UL,ISO9001,ROHS and GJB9001B certified.


Packing and Shipping:




1. How to Get a quotation?

For PCBs,pls send us the Gerber File.For PCBA,pls send us the Gerber file and BOM(Bill of Materials)

2. What is the MOQ?

No MOQ.1 pcs is ok.

3.What is the lead time?

For PCB orders,the lead time is 2 to 10 days.For PCBA orders,the lead time will be 15 to 30 days.

4.Will the boards be tested before shippment?

Yes,all PCBs will be tested by Flying Probe or E-test.For PCBA,we will have AOI,X-ray,and functional test

Email us to get a quote: admin@brightcircuits.com


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