Difference and Difference between Expanded PTFE Plate and Common PTFE Plate.

Update:25 Apr 2018
Summary:

The theoretical limit temperature of expanded PTFE mate […]

The theoretical limit temperature of expanded PTFE material is -218+260, and the actual safe use temperature is only about half.
Expanded PTFE is the raw material and the material is raw material.
The ordinary polytetrafluoroethylene is sintered after 327 degrees.
Expanded PTFE material approaching or exceeding the high temperature limit temperature will become common PTFE material after cooking, and the size is greatly reduced, you can use a lighter to burn and make a test.
If you approach or limit the negative temperature, don't know for a while, the size should also be significantly reduced.