In recent years, customers demanding the production of high Tg printed boards have increased year by year. Let's talk about what a high Tg board is.

    High Tg refers to high heat resistance. Generally, the Tg plate is 130 degrees or more, the high Tg is generally more than 170 degrees, the medium Tg is more than 150 degrees, and the PCB printed board usually having a Tg ≥ 170 ° C is called a high Tg printed board. With the rapid development of the electronics industry, especially the electronic products represented by computers, the development of high functionality and high multi-layer requires the higher heat resistance of PCB substrate materials as an important guarantee. The emergence and development of high-density mounting technology represented by SMT and CMT makes PCBs more and more inseparable from the high heat resistance of substrates in terms of small aperture, fine wiring and thinning.

    The Tg of the substrate is improved, and the characteristics of heat resistance, moisture resistance, chemical resistance, and stability of the printed board are improved and improved. The higher the TG value, the better the temperature resistance of the sheet, especially in the lead-free process, the high Tg application is more.

    Therefore, the difference between general FR-4 and high Tg FR-4 is that it is in the hot state, especially under heat absorption, the mechanical strength, dimensional stability, adhesion, water absorption, thermal decomposition of the material. There are differences in various conditions such as thermal expansion, and high Tg products are obviously better than ordinary PCB substrate materials.