Composite epoxy materials (CEM) are a group of
composite material
A composite or composite material (also composition material) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or physical properties and are merged to create a ...
s typically made from woven glass fabric surfaces and non-woven glass core combined with
epoxy
Epoxy is the family of basic components or Curing (chemistry), cured end products of epoxy Resin, resins. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers which contain epoxide groups. The epoxide fun ...
synthetic resin. They are typically used in
printed circuit board
A printed circuit board (PCB), also called printed wiring board (PWB), is a Lamination, laminated sandwich structure of electrical conduction, conductive and Insulator (electricity), insulating layers, each with a pattern of traces, planes ...
s.
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
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*
References
Composite materials
Electronic design
Fibre-reinforced polymers
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