ポリテトラフルオロエチレンでしょう
poritetorafuruoroechirendeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of ポリテトラフルオロエチレン

1. Polytetrafluoroethylene, likely.; PTFE, likely.

Polite
Presumptive
Conjecture