Do you know what is TG value 你知道什么是TG值吗?

For circuit boards exposed to high thermal loads, the necessary long-term operating temperature must be determined early on, in order to select an appropriate material.


The glass transition temperature (Tg) is an important normative dimension for the base material that determines the temperature at which the resin matrix converts from a glassy, brittle condition into a soft, elastic one. 

The Tg value of the base material sets here an upper boundary, at which the resin matrix decomposes and a subsequent delamination occurs. The Tg is thus not the value of the maximum operational temperature, but rather that which the material can endure for only a very short time. A guideline for a continuous thermal load is an operating temperature approximately 25°C below the Tg.

When the glass transition temperature (Tg) is over 170°C, it is referred to as a high Tg material.High Tg materials have the following properties:

high glass flow temperature value (Tg),high temperature durability,long delamination durability,Low Z axis expansion (CTE)

For example you can see the below TG value.







Tg 基体材料的集合一个 上边界,在基体树脂的分解和随后的分层发生。因此,热重是不是最大的操作温度的值,而是该材料可以忍受的只有很短的时间。一个 连续热负荷是一个操作温度低于Tg大约25°C


在玻璃化转变温度(Tg)是 超过170°C,它被称为 Tg材料。高Tg材料具有以下特性:高高的玻璃液流的温度值(TG)、耐高温、耐久性长的分层,低Z轴膨胀(CTE.