Question

Which polymer is used to make gasket of pressure cooker gasket?
(A) Polythene
(B) Nylon
(C) Teflon
(D) Thiokol

Answer 1

Hint: In the above question, it is asked which polymer is used to make a gasket of pressure cooker. A pressure cooker gasket is also known as a sealing ring. It is used to keep the appliance airtight, which keeps the steam stored between the pan and the lid to build up pressure. Two materials which are used to make pressure cooker gaskets are Rubber and Silicone.

Complete step by step solution
Let us first look at the given options briefly:
Polythene:
Polyethylene consists of nonpolar, saturated, high molecular weight hydrocarbons. Therefore, its chemical behaviour is similar to paraffin. They are not attached by covalent bonds and do not absorb water. The gas and water vapour permeability is lower than for most plastics.
Nylon:
Nylons are the copolymer formed by mixing equal parts of amines and carboxylic acid. They are used in conveyor and seat belts, parachutes, airbags, nets and ropes, tarpaulins, thread, and tents. It is used as plastic in manufacturing machine parts.
Teflon:
Teflon is made up of chemical coating, polytetrafluoroethylene. It is known for its use in cookware, although it can also be used to coat other materials like wires or fabrics to make them waterproof. It is almost inert.
Thiokol:
Thiokol rubber mixed with oxygen releasing chemicals is used as a solid fuel in rocket engines. They are used for building materials which are exposed to oil and pressure.
Hence, we can conclude that Teflon is used for making pressure cooker gaskets. So, option C is the correct option.

Note
Teflon is a synthetic chemical which is made up of carbon and fluorine. It provides a non-reactive, non-stick and frictionless surface. Hence, it requires little oil or butter, making it a healthy way to cook and fry.