Which polymer is described as fatigue and chemical resistant and used for rope?

Which polymer is described as fatigue and chemical resistant and used for rope?

• A. PP
• B. PMMA
• C. HIPS
• D. UPVC

Answer: (A)

The key idea is choosing a polymer that can handle repeated flexing and exposure to chemicals, which is essential for rope. Polypropylene stands out because its structure gives it good fatigue resistance—so it can bend and stretch under load many times without cracking. It also resists chemicals well, since it is a non-polar hydrocarbon polymer, so acids, bases, and many solvents don’t easily attack it. Add in a low density that makes rope float and stay comparatively light, and you get a material that’s flexible, durable, and practical for rope use. Other polymers listed don’t fit as well for rope: some are hard and brittle, which isn’t good for repeated bending; others lack the chemical resistance or the necessary flexibility, making them less suitable for a fibrous, durable rope.

The key idea is choosing a polymer that can handle repeated flexing and exposure to chemicals, which is essential for rope. Polypropylene stands out because its structure gives it good fatigue resistance—so it can bend and stretch under load many times without cracking. It also resists chemicals well, since it is a non-polar hydrocarbon polymer, so acids, bases, and many solvents don’t easily attack it. Add in a low density that makes rope float and stay comparatively light, and you get a material that’s flexible, durable, and practical for rope use.

Other polymers listed don’t fit as well for rope: some are hard and brittle, which isn’t good for repeated bending; others lack the chemical resistance or the necessary flexibility, making them less suitable for a fibrous, durable rope.