the following example is for you reference.

High Tg printed circuit board when the temperature rises to a certain area, the substrate will be from the "glass state" to "rubber state", the temperature is called the plate glass temperature (Tg). In other words, Tg is the highest temperature of the substrate to maintain rigidity (C). that is to say the common PCB substrate material under high temperature, not only produce softening, deformation, melting and other phenomena, but also a sharp decline in the mechanical and electrical properties of (I think you do not want to see their products appear this kind of circumstance).
General Tg plate for 130 degrees, high Tg is generally greater than 170 degrees, medium Tg is about more than 150 degrees.
Tg is usually less than 170 DEG C PCB printed circuit board, called the high Tg printed circuit board.

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