High-TG PCBs

High TG (Glass Transition Temperature) PCB is a Printed Circuit Board (PCB) with TG equal to or greater than 170°C, which is the threshold for what is considered ‘high.’ Therefore, this is a PCB that is designed to withstand high temperatures.

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High-TG PCBs High Temperature PCB FR4 Material

Circuit board material must flame-resistant, it can’t be burned at a certain temperature and only be softened. The temperature point is called the glass transition temperature (Tg).


The higher Tg point means a higher temperature requirement during lamination. And the boards will be hard and crisp, which will affect the hole and the electrical properties.

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Ordinary PCB materials at high temperatures, not only will be softened, deformation, melting and other phenomena, but also the mechanical and electrical properties decline sharply.

General FR4 Tg is 130-140 centigrade, moderate Tg is greater than 150-160 centigrade, High-Tg is greater than 170 degrees.


The higher of Tg, the better the performance of PCB heat resistance, moisture resistance, chemical resistance, stability and other characteristics.

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FR4 is a code name for the grade of Epoxy Glass material.

Tg means Glass Transition Temperature.


When the working temperature reaches the melting point, that means the temperature exceeds the Tg value, the status of PCB material will be changed from glassy to liquid, which will affect the function of PCB. And this value is related to the stability of the PCB dimension.


As usual, made with Tg ≥ 170℃ PCB material, which is called a high Tg printed circuit board. With the rapid development of the electronics industry, high Tg material is widely used in computers, communication equipment, precise apparatus, and instruments, etc.

Check AlteraFlex High-Tg PCB manufacturing capabilities in the following table:

Feature Capability
Material Tg140 FR-4,Tg150 FR-4,Tg170 FR-4,Tg150 FR-4 (Halogen-free), Tg170 FR-4 (Halogen-free)
Min. Track/Spacing 2mil
Min. Hole Size 0.15mm
Finished Cooper 0.5-13oz
Board Thickness 0.2-6mm
Surface Finishing HASL lead free,Immersion gold, OSP, Hard Gold,Immersion SIlver,Enepig
Solder Mask Green, Red, Yellow, Blue, White, Black, Purple, Matte Black, Matte green
Silkscreen White, Black
Via Process Tenting Vias,Plugged Vias,Vias not covered
Testing Fly Probe Testing (Free) and A.O.I. testing
Build time 7-10 days

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