Purchase Quick Turn High Tg Fr4 Custom Printed Circuit PCB Board Online
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"Tg" refers to the glass transition temperature of a printed circuit board, indicates the point at which the PCB material will begin to transform. Standard PCBs are manufactured with materials offering a TG value of 140C, which can withstand an operating temperate of 110°C. Besides, PCBonestop also offer high tg printed circuit online for customers.
As flammability of online printed circuit is UL 94-V0, so if the temperature exceeds designated Tg value, the board will changed from glassy state to rubbery state and then the function of PCB will be affected.
If working temperature of your product is higher than normal (130-140C), then have to use high Tg material which is > 170C. And popular PCB high values are 170C, 175C, and 180C. Normally the PCB Tg value should be at least 10-20C higher than working temperature of product. If you 130TG board, working temperature will be lower than 110C; if use 170 high TG board, then maximum working temperature should be lower than 150C.
If the Tg of PCB substrate is increased, the heat resistance, moisture resistance, chemical resistance and stability of printed circuit boards will be improved as well. The high Tg applicates more in the lead free pcb manufacturing process.
Therefore, the difference between general FR4 and high Tg FR4 is, in the hot state, especially in the heat absorption with moisture, the high Tg PCB substrate will perform better than general FR4 in the aspects of mechanical strength, dimensional stability, adhesiveness, water absorption and thermal decomposition.
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