Which polymer is commonly used for fibers and bottles?

• A. Polypropylene
• B. Polyethylene
• C. Polystyrene
• D. Polyvinyl chloride

Answer: (A)

Polypropylene fits both roles thanks to a combination of properties that chemists and engineers look for in a versatile packaging and textile polymer. It is easy to melt and draw into fine filaments, so it can be spun into strong, lightweight fibers used in carpets, textiles, and nonwoven fabrics. At the same time, it resists many chemicals and has a relatively high softening temperature, making it suitable for containers that hold beverages or foods, as well as for bottle caps and other packaging components that endure handling and heat during processing. This balance of processability for fibers and durability and safety for packaging is what makes polypropylene a common choice for both applications. Other polymers in the list tend to be more specialized: some are rigid or brittle and not ideal for fibers, while others are widely used for bottles but don’t offer the same combination of textile and packaging performance.