Which polymer is commonly used for ropes, packaging and films because of its low density and flexibility?

Which polymer is commonly used for ropes, packaging and films because of its low density and flexibility?

• A. Polypropylene
• B. Nylon
• C. Polyethylene
• D. High-Density Polyethylene

Answer: (A)

Low density and the ability to be formed into fine fibers and thin films are exactly what make a polymer ideal for ropes, packaging, and films. Polypropylene fits this need well: its density is around 0.90 g/cm3, so it’s lighter than many other polymers, and it can be drawn into strong fibers for ropes while still remaining flexible. It also blows into clear, durable films used in packaging, including widely used biaxially oriented polypropylene films. These properties—light weight, good flexibility, and versatility in forming fibers and films—explain why polypropylene is commonly chosen for these applications. Nylon is stronger but heavier and more moisture-absorbent; polyethylene can be flexible, but HDPE is stiffer and heavier, and the specific combination of lightness, flexibility, and film/fiber processing is most characteristic of polypropylene.

Low density and the ability to be formed into fine fibers and thin films are exactly what make a polymer ideal for ropes, packaging, and films. Polypropylene fits this need well: its density is around 0.90 g/cm3, so it’s lighter than many other polymers, and it can be drawn into strong fibers for ropes while still remaining flexible. It also blows into clear, durable films used in packaging, including widely used biaxially oriented polypropylene films. These properties—light weight, good flexibility, and versatility in forming fibers and films—explain why polypropylene is commonly chosen for these applications. Nylon is stronger but heavier and more moisture-absorbent; polyethylene can be flexible, but HDPE is stiffer and heavier, and the specific combination of lightness, flexibility, and film/fiber processing is most characteristic of polypropylene.