Which polymer is used to make bottle caps?

Correct option is A

The correct answer is (a) Polypropylene
Explanation:
• Polypropylene (PP) is a thermoplastic polymer widely used to manufacture bottle caps.
• It is preferred because of its resistance to fatigue (it doesn't break easily when bent repeatedly, essential for "living hinges" on flip-tops) and its resistance to chemical solvents.
• It has a high melting point compared to other common plastics, making it suitable for hot-fill applications.
Information Booster:
• Recycling Code: Polypropylene products are usually marked with the Resin Identification Code 5.
• Properties: It is tough, lightweight, and heat-resistant.
• Discovery: It was first polymerized by Giulio Natta in 1954.
Additional Knowledge:
(b) Low-density polyethylene (LDPE) (Option b)
• Used for making squeeze bottles, shopping bags, and plastic wraps. It is flexible but has low tensile strength.
(c) Polystyrene (Option c)
• Used for making disposable cups, cutlery, and packaging materials (Styrofoam). It is generally brittle.
(d) High-density polyethylene (HDPE) (Option d)
• commonly used to make the bottles