Write down the preparation,properties and uses of Polytetrafluoroethene (Teflon).

(N/A) Preparation: Polytetrafluoroethene (Teflon) is manufactured by heating tetrafluoroethene with a free radical or persulphate catalyst at high pressures.
The chemical reaction is: $n CF_2=CF_2 \xrightarrow[\text{High Pressure}]{\text{Catalyst}} -(CF_2-CF_2)-_n$
Properties:
$1$. It is chemically inert and resistant to attack by corrosive reagents.
$2$. It has a high melting point and is tough.
$3$. It is non-stick and has low coefficient of friction.
Uses:
$1$. It is used in making oil seals and gaskets.
$2$. It is used for non-stick surface coating of cooking utensils.