FR-4 practical significance
FR-4 is a code for the class of flame resistant materials, which means that the resin material through the combustion state must be able to self-extinguish a material specifications, it is not a material name, but a material grade.
Therefore,the current general circuit board used FR-4 grade material has many types, but most of composite materials are made based on the so-called four-function (Tera-Function) of the epoxy resin plus filler and glass fiber.
FR-4 performance and characteristics
FR-4 epoxy fiberglass substrate, which is made of epoxy resin as a binder and Electronic-grade glass fiber cloth as a reinforcing material-based substrate. Its adhesive sheet and thin inner core CCL are important substrates for making multilayer printed circuit boards.
Epoxy fiberglass substrate of mechanical properties, dimensional stability, impact resistance, moisture resistance are higher than the paper substrate. Its electrical performance is excellent, the working temperature is higher, its performance is less affected by the environment. In the processing technology, epoxy fiberglass substrate has great advantages than other resin glass fiber cloth substrate. This type of product is mainly used for double-sided PCB ,and usage is very large. Epoxy fiberglass substrate, which the most widely used product model is FR-4. In recent years, due to electronic product installation technology and PCB technology development needs, high Tg FR-4 product has appeared.
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