FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant self-extinguishing.To get more news about Isola 370HR PCB, you can visit pcbmake official website.

FR-4 glass epoxy is a popular and versatile high-pressure thermoset plastic laminate grade with good strength to weight ratios. With near zero water absorption, FR-4 is most commonly used as an electrical insulator possessing considerable mechanical strength. The material is known to retain its high mechanical values and electrical insulating qualities in both dry and humid conditions. These attributes, along with good fabrication characteristics, lend utility to this grade for a wide variety of electrical and mechanical applications.
Of these, FR-4 is the grade most widely in use today. G, the predecessor to FR-4, lacks FR-4's self-extinguishing flammability characteristics. Hence, FR-4 has since [ when? FR-4 epoxy resin systems typically employ brominea halogen, to facilitate flame-resistant properties in FR-4 glass epoxy laminates. Some applications where thermal destruction of the material is a desirable trait will still use G non flame resistant.

Typical physical and electrical properties of FR-4 are as follows. The abbreviations LW lengthwise, warp yarn direction and CW crosswise, fill yarn direction refer to the conventional perpendicular fiber orientations in the XY plane of the board in-plane.

In terms of Cartesian coordinateslengthwise is along the x-axis, crosswise is along the y-axis, and the z-axis is referred to as the through-plane direction. Keep in mind that the values for the parameters listed below are an example for a certain manufacturer's material. Each manufacturer will have slightly different values for the parameters listed below. It's better to check the datasheet of the specific material being used. Verifying the actual values is very important for high frequency designs.

FR-4 is a common material for printed circuit boards PCBs. A thin layer of copper foil is laminated to one or both sides of an FR-4 glass epoxy panel. These are commonly referred to as copperclad laminates. When ordering a copper clad laminate board, the FR-4 and copper thickness can both vary and so are specified separately.

These work out to thicknesses of FR-4 is also used in the construction of relaysswitchesstandoffsbusbarswashersarc shields, transformers and screw terminal strips. From Wikipedia, the free encyclopedia. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Poole; P. Witting Journal of Electronic Materials. Categories : Printed circuit board manufacturing Fibre-reinforced polymers.

Hidden categories: Articles needing additional references from September All articles needing additional references All articles with vague or ambiguous time Vague or ambiguous time from August Namespaces Article Talk.When you give a PCB for fabrication, you need to specify details on PCB materials, impedance controls, finish, copper thickness and so on.