FR4 consists of fiberglass and a flame-retardant epoxy resin. It’s often used as an insulator in dry or humid conditions. Because it offers consistently excellent mechanical and electrical performance, it’s considered a generalist material that works for various applications.
The FR in FR4 stands for “flame retardant,” while the 4 signifies that it’s a glass epoxy.
The conventional thickness range of FR4 fiberglass sheets is 0.3mm to 100mm. Common thicknesses include 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.6mm, 1.8mm and 2.0mm. The thickness error of the sheet will be determined according to the production capacity of the sheet mill .
Dielectric constant refers to the response ability of the material to the electric field under the action of the electric field in the insulating material. It is one of the physical quantities that characterizes the electrical insulation performance of the insulating material. Generally speaking, the dielectric constant is the ability of the material to store charge. The larger the number, the stronger the ability of the material to store charge, the better the insulation performance.
The dielectric constant of the FR4 fiberglass sheets is usually between 4.0 and 4.8.
FR4 fiberglass sheet is a common insulating material that is widely used in the electronics, communications and electrical industries. Its dielectric constant is a physical quantity that describes the ability of a material to store electrical energy under the action of an electric field. The size of the dielectric constant depends on the molecular structure and electrical properties of the material. For FR4 fiberglass sheet, due to the properties of their internal fiber structure and resin matrix, the dielectric constant is usually between 4.0 and 4.8.
In the design, people usually take the classical value of dielectric constant is 4.4. Here are a few notes on FR-4’s dielectric constant:
The dielectric constant varies with temperature. In the temperature range of 0~70℃, the maximum change range can reach 20%.
The dielectric constant also changes with the frequency of the signal. In general, the higher the frequency, the smaller the dielectric constant.
Different manufacturers and different batches of FR4 fiberglass sheets production.Due to different doping, the dielectric constant will be different.
It should be noted that the dielectric constant of FR4 fiberglass sheets may be affected by a number of factors, such as temperature, humidity, frequency, etc. Therefore, in the specific application, the dielectric constant of FR4 fiberglass sheet needs to be properly corrected and adjusted according to the actual situation.
In addition, the dielectric constant is not the only important electrical performance parameter of FR4 fiberglass sheets, and other indicators such as dielectric strength and insulation resistance also need to be considered. Therefore, when selecting FR4 fiberglass sheets, it is necessary to comprehensively consider its electrical performance parameters to meet the specific application needs.
The dielectric constant has a significant effect on the electrical insulation properties, dielectric strength and capacitance of insulating materials.
1.Electrical insulation performance
The larger the dielectric constant of the insulating material, the better the electrical insulation performance of the material. This is because the greater the dielectric constant, the stronger the ability of the material to store charge, the stronger the obstruction of charge movement in the material. So the electrical conductivity will become worse, thus enhancing the electrical insulation performance of the material.
2.Dielectric strength
Dielectric strength refers to the maximum electric field strength that an insulating material can withstand. The greater the dielectric constant, the smaller the amount of charge the material will withstand under the same electric field, which means that the dielectric strength of the material is higher and it is more able to withstand the role of high electric fields.
3.Electrical capacity
The dielectric constant also affects the electrical capacity of the insulating material. Capacitance refers to the ability of an insulating material to store charge under the action of an electric field, which is directly proportional to the dielectric constant. The greater the dielectric constant, the greater the capacitance.
If you are looking for FR4 fiberglass sheets, please contact ZTelec Group. ZTelec Group is a professional manufacturer of high-quality electrical insulation materials with more than 60 years of manufacturing experience.it can be customized according to the product specifications, thickness and purpose you need.
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