General Tg board for more than 130 degrees, high Tg generally greater than 170 degrees, medium Tg is greater than 150 degrees.
Usually TG of 170 ℃ or more PCB PCB, called high TG PCB.
When increases TG for the substrate, the PCB board cane withstand heat resistance, moisture resistance, chemical resistance, resistance to stability characteristics will improve and enhance. The higher the TG values, plate temperature resistant performance is good, especially in the lead-free process, high TG application is very popular. High TG means high heat resistance.
The difference for normal TG and high TG is:
under the hot circumstance, especially after moisture absorption heat, its material mechanical strength, dimensional stability, adhesion, water absorption, thermal decomposition, thermal expansion differences between various conditions such as high Tg products bright sun better than ordinary PCB substrate material.
