Teflon is a polymer of

Teflon is manufactured by heating tetrafluoroethene in the presence of suitable catalyst and high pressure.

$\underset{\mathrm{Tetrafluoroethene}}{{\mathrm{nCF}}_2={\mathrm{CF}}_2}\stackrel{\mathrm{Catalyst}, \mathrm{high} \mathrm{pressure}}{\to }\underset{\mathrm{Teflon}}{{\left[-{\mathrm{CF}}_2-{\mathrm{CF}}_2-\right]}_{\mathrm{n}}}$