Question

The polymer used in making gaskets and non-stick coating utensils is

• A. Polyvinyl chloride
• B. Polystyrene
• C. Polytetrafluoroethylene
• D. Polythene

Hint:

Teflon is polytetrafluoroethylene and is used for non-stick coatings and chemically resistant gaskets.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks to identify a polymer based on its specific industrial and household applications, namely for manufacturing gaskets and non-stick coatings.
Step 2: Detailed Explanation:

Polytetrafluoroethylene (PTFE):
Commonly known by the brand name Teflon, PTFE is a synthetic fluoropolymer of tetrafluoroethylene (\(CF_2=CF_2\)).
It is produced by the addition polymerization of tetrafluoroethylene monomers.

Key Properties:
1. Chemical Inertness: It is extremely unreactive because of the strong Carbon-Fluorine bonds. It is resistant to acids, bases, and organic solvents.
2. Thermal Stability: It has a high melting point and remains stable over a wide temperature range.
3. Low Friction: It has one of the lowest coefficients of friction against any solid. This "slipperiness" makes it ideal for non-stick applications.

Applications:
- Non-stick Coatings: Used on frying pans and other cookware because food does not stick to it even at high temperatures.
- Gaskets and Seals: Due to its high chemical and thermal resistance, it is extensively used for making gaskets, valve seats, and seals in chemical industries.

Other Options:
- PVC: Used for pipes and raincoats.
- Polystyrene: Used for packaging and disposable cups (thermocol).
- Polythene: Used for carry bags and toys.

Step 3: Final Answer:
Polytetrafluoroethylene (PTFE or Teflon) is the polymer used for non-stick coatings and industrial gaskets.