Composite epoxy materials (CEM) are a group of composite materials typically made from woven glass fabric surfaces and non-woven glass core combined with epoxy synthetic resin. They are typically used in printed circuit boards.
There are different types of CEMs:
- CEM-1 is low-cost, flame-retardant, cellulose-paper-based laminate with only one layer of woven glass fabric.
- CEM-2 has cellulose paper core and woven glass fabric surface.
- CEM-3 is very similar to the most commonly used PCB material, FR-4. Its color is white, and it is flame-retardant.
- CEM-4 quite similar to CEM-3 but not flame-retardant.
- CEM-5 (also called CRM-5) has polyester woven glass core.
See also
- Micarta – Brand name for a fabric-plastic composite
- Fibre-reinforced plastic – Composite material made of a polymer matrix reinforced with fibres
References
Inc, ANSYS. "Characterization of CEM-1 Boards". www.dfrsolutions.com. Retrieved 2022-01-20. {{cite web}}: |last= has generic name (help) https://www.dfrsolutions.com/characterization-of-cem-1-boards ↩
Andy (2023-05-02). "Composite Epoxy Material | What You Need to Know - FR Fabric". Retrieved 2023-07-20. https://frfabric.com/alkali-resistance/ ↩
admin. "FR1-FR3, CEM1-CEM3,FR4, Aluminum Flex CCL introductions | PCB Blog". Retrieved 2022-01-20. http://caringcircuit.com/blog/ccl-fr1-fr-3-cem-1-cem-3-fr4-aluminum-flex/ ↩
"Why Is Cem-1 PCB Material still Popular in the Circuit Board Market ?". Printed Circuit Board Manufacturing & PCB Assembly - KingShengPCBA. 2018-03-14. Retrieved 2022-01-20. https://www.kingshengpcba.com/pcb-assembly/pcb-and-pcba/ ↩
"CEM-1 PCB". Venture Electronics. Retrieved 2022-01-20. https://www.venture-mfg.com/cem-1-pcb/ ↩
PCB Directory Editorial Team (12 July 2019). "What are Composite Epoxy Materials (CEMs)?". PCB Directory. Archived from the original on 2022-01-20. Retrieved 20 January 2022. {{cite web}}: |last= has generic name (help) https://c-alley.com/ ↩