source:Industry News release time:2023-11-27 Article author:yu Popular:pcb
In terms of electrical performance, it includes dielectric constant and loss angle, ① dielectric constant or dielectric coefficient, and the surface is a coefficient of insulation capacity characteristics, expressed in units of ε In actual production, the dielectric constant is not an absolute value, but expressed in the form of relative dielectric constant The loss angle, also known as the "loss factor" or "damping factor", is the tangent of the phase difference angle between the strain and stress cycles of a material in an alternating field, which is also equal to the ratio of the loss film amount of the material to the stored energy modulus.
Thermal performance method: It is necessary to have a certain understanding of the relevant characteristic parameters. Below, we will introduce the definition manual of thermal performance parameters for two different sheet materials:
① From the perspective of plate types, it can be mainly divided into Tg value, Td value, CTE, and T288/T260/T300. Tg value refers to the glass transition temperature, which is the temperature at which glass substances convert into glass and high elastic states. In the circuit board printing industry, this glass substance generally refers to a dielectric layer composed of resin and fiberglass cloth. The Tg requirement for ordinary Tg plates is greater than 135 ℃, the medium Tg requirement is greater than 150 ℃, the high Tg requirement is greater than 170 ℃, and the higher the Tg value, Usually, its heat resistance and dimensional stability are better.
② The Td value, also known as the "thermal decomposition temperature", refers to the temperature at which PCB boards lose 5% weight when heated. Usually, TGA testing method is used. The higher the Td value, the better the material stability.
③ CTE, also known as "thermal expansion coefficient", is commonly used to measure the performance of PCB boards as a linear coefficient. The lower the CTE value, the better the dimensional stability, and vice versa.
④ T28 is a standard technology that reflects the welding resistance conditions of printed PCB boards produced by high-frequency circuit board manufacturers. This type of board can withstand welding high temperatures at 288 ℃ for the longest time without generating bubbles, delamination, and other decomposition phenomena, which is increasingly advantageous for welding.
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