Which polymer is low density, tough, flexible and used for ropes, carpets and packaging?

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

Answer: (A)

Polypropylene fits this combination of low weight, toughness and flexibility, plus versatility in forming fibers and films. Its density is around 0.90 g/cm3, which keeps products light, while its semicrystalline structure gives good strength and the ability to bend without cracking. That makes it ideal for making fibers used in ropes and carpets, where you want something that’s strong yet flexible and resilient. In packaging, polypropylene can be processed into clear, tough films and sturdy containers that seal well and resist chemicals, all at a reasonable cost.

Nylon, while very strong, is denser and tends to absorb moisture, which can affect performance in some packaging and fiber applications. Polyethylene comes in variants with different densities, but it isn’t as tough or as well-suited for fibers used in ropes and carpets as polypropylene. High-density polyethylene is even more rigid, which limits its flexibility for these uses.