CEM-3 CCL is listed on the structure with glass mat (also known as non-woven fabric) impregnated with epoxy resin, and then laminated with glass fiber cloth on both sides, then composited with copper foil and hot pressed. It is modified by FR4, but it differs from FR4 in that it uses glass felt to remove most of the fiberglass cloth, which increases the "toughness" in terms of mechanical properties. Usually CEM-3 CCL is directly fabricated into two sides. CCL-3, CEM-3 sheet in the drilling process, the processing convenience is higher than FR4, the reason is that the glass mat is structurally looser than glass fiber, in addition to punching processing is also better than FR4.
The shortcomings of CEM-3 compared to FR4: CEM-3 thickness and accuracy are not as good as FR4; pcb circuit board is also more distorted than FR4 after soldering.
CEM-3 CCL has the following characteristics:
1 Basic performance equivalent to FR4 CCL
2 Excellent machining performance
3 Conditions of use are the same as FR4 CCL
4 cost lower than FR4 CCL
In short, CEM-3 is a product similar to FR4, which can be applied to the production of pcb for a variety of electronic products, especially in terms of price.
Some CEM-3 products are superior to the general FR4 products in terms of leakage resistance (cti), circuit board dimensional accuracy, dimensional stability, etc., and CEM-1 and CEM-3 are used instead of FR4 substrate to manufacture double-sided. Pcb has been widely used in Japan, Europe and the United States and other countries and regions.