Editorial Team - PCB Directory
Sep 15, 2019
Composite epoxy materials (CEMs) are made by combining two or more materials having different chemical and physical properties to achieve the desired substrate material with unique properties and characteristics. CEMs are generally used in PCBs as a substrate material.
The PCB boards which use woven glass fabric and paper (cellulose) along with epoxy as the substrate material are called CEM-3 PCB boards. This material is milky-white in colour and widely used in the manufacturing of double-layer PCBs.
CEM-3 has excellent electrical and mechanical properties. It shows outstanding tolerance for mechanical processes like milling and punching. CEM-3 has lower mechanical strength compared to FR4, but it is cheaper than FR4. CEM-3 boards are able to withstand high levels of solder heat and are compatible with lead-free soldering.
CEM-3 printed circuit boards are now widely used in automotive electronics, telephones, household appliances, instrumentation, and fax machines.
Click here to see a list of CEM-3 PCB Board Manufacturers.
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