Composite epoxy material
Composite Epoxy Materials (CEM) are a group of composite materials typically made of woven glass fabric surfaces and non-woven glass core combined with epoxy 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, FR4. Its color is white and it is flame retardant.
CEM-4 quite similar as CEM-3 but not flame retardant.
CEM-5 (also called CRM-5) has polyester woven glass core.