Nylon static kernmantle rope becomes sticky at a temperature of about and melts between which temperatures?

Nylon static kernmantle rope becomes sticky at a temperature of about and melts between which temperatures?

• A. Sticky at 445°F; melts 480–500°F
• B. Sticky at 500°F; melts 600–650°F
• C. Sticky at 300°F; melts 450–470°F
• D. Sticky at 600°F; melts 700–730°F

Answer: (A)

Nylon rope responds to heat by first softening and becoming tacky, then actually melting as the temperature rises further. The tackiness occurs in the mid-400s Fahrenheit, and the melting range for nylon is in the high 400s to around 500°F. The given correct values—sticky at about 445°F and melting between 480–500°F—match these known behavior ranges: the surface viscosity increases as the polymer chains gain mobility, leading to a sticky feel, while the bulk melting point occurs around 480–500°F. Other options place the tackiness or melting point outside nylon’s typical thermal behavior. For example, sticky at 500°F with melting well above 600°F would contradict nylon’s actual melting point, and numbers like sticky at 300°F or melting near 700°F don’t align with nylon’s characteristic softening and melting temperatures.

Nylon rope responds to heat by first softening and becoming tacky, then actually melting as the temperature rises further. The tackiness occurs in the mid-400s Fahrenheit, and the melting range for nylon is in the high 400s to around 500°F. The given correct values—sticky at about 445°F and melting between 480–500°F—match these known behavior ranges: the surface viscosity increases as the polymer chains gain mobility, leading to a sticky feel, while the bulk melting point occurs around 480–500°F.

Other options place the tackiness or melting point outside nylon’s typical thermal behavior. For example, sticky at 500°F with melting well above 600°F would contradict nylon’s actual melting point, and numbers like sticky at 300°F or melting near 700°F don’t align with nylon’s characteristic softening and melting temperatures.