1.What is TG

TG is short for Glass of Transitioin,Glas transition temperature is the temperature range where a thermoseting polymer changes from a hard,rigid or glasy state to a more pliable,compliant or rubery state,insulators which are exposed to a temperature below the Tg.

In APG technique,to casting APG products,like epoxy resin insulators,curent transformer,bushings,contact box,Tg test is a necesary test to check product quality.