We believe that the partial temp of the chamber over 350 ℃ , Also The possibility of the fire is exist.
The problem of the bag damaged is not caused by the thread, But for the temp.
As we know The PTFE thread is better than fiberglass thread whether on chemical resistance or the abrasion resistance.
It's also more expensive then FIBERGLASS thread.
The Change of the thread can't helps.
If the working temp can be controlled under 250℃ and the instant temp can be controlled under 280℃
It won't have the problem as above.