Which line is known for elongation approaching one third of its original length before failure?

• A. Nylon
• B. Polyester
• C. Aramid
• D. Kevlar

Answer: (B)

When a line is loaded to the point of failure, how much it can stretch before breaking is its elongation at break, a measure of ductility. Among common synthetic lines, aramid fibers (like Kevlar) have very low elongation, giving high stiffness and quick failure with little stretch. Nylon is known for substantial stretch, absorbing energy as it lengthens under load. Polyester sits in between and, depending on the grade and processing, can exhibit noticeable elongation that approaches a third of its original length before failing. This level of stretch provides some shock absorption without sacrificing too much strength, which is why polyester lines are described as having such a relatively high elongation in many standard specs.