source:Industry News release time:2022-03-11 Article author:sznbone Popular:pcb
When the temperature of high Tg printed circuit boards rises to a certain threshold, the substrate will change from "glass state" to "rubber state", and the temperature at this time is called the glass transition temperature (Tg) of the board. That is, Tg is the maximum temperature (°C) at which the substrate remains rigid. That is to say, ordinary PCB substrate materials continue to soften, deform, and melt at high temperatures, and at the same time, they also show a sharp decline in mechanical and electrical properties, which will affect the service life of the product. Generally, the Tg plate is 130 Above ℃, high Tg is generally greater than 170℃, and medium Tg is greater than 150℃; usually PCB printed boards with Tg ≥ 170℃ are called high Tg printed boards; the Tg of the substrate is increased, and the heat resistance of the printed board, Characteristics such as moisture resistance, chemical resistance, stability resistance, etc. are all enhanced and improved. The higher the TG value, the better the temperature resistance of the sheet, especially in the lead-free process, high Tg applications are more common; high Tg refers to high heat resistance.
With the rapid development of the electronics industry, especially the electronic products represented by computers, towards the development of high functionality and high multi-layer, higher heat resistance of PCB substrate materials is required as a premise. The emergence and development of high-density mounting technologies represented by SMT and CMT have made PCBs more and more inseparable from the support of high heat resistance of substrates in terms of small apertures, fine lines, and thinning.
Therefore, the difference between general FR-4 and high Tg: at high temperature, especially when heated after moisture absorption, the mechanical strength, dimensional stability, adhesion, water absorption, thermal decomposition, thermal expansion, etc. There are differences in these situations, and high Tg products are obviously better than ordinary PCB substrate materials.
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