Wet Rope Strength

Strength is the tensile strength from the manufactures specifications without knots. According to sterling rope a non dry treated rope can lose 70 percent of its strength and a dry treated rope can be 40 percent weaker when wet. One boater will talk about tensile strength while the other will talk about working load.

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Manufacturers results for knotted tensile strength throwbag rope values with an overhand knot.

Wet rope strength.

Strength 8 is the min. However when wet it is possible to see as much as a 70 percent reduction in dynamic performance which is important when taking a lead fall. Test 1 is the dry test with figure of eight knots. But again for toproping this isn t an issue.

Static strength is most important when rappelling and ropes can have up to a 30 percent strength loss there. But a wet nylon rope is also weaker than a dry one. In sterling s tests an 11 mm drycore rope held 11 falls dry and seven falls wet. Each of these measurements has different uses and here we re going to give.

A wet rope is not dangerously weakened for rappelling compared with a dry rope. Both of these are important measurements and it s worth learning how to measure and understand them. Four inches is the magic number for maintaining full strength in a rope up to 5 8. A wet rope is not dangerously weakened for rappelling compared with a dry rope.

Rope strength is a misunderstood metric. However when wet it is possible to see as much as a 70 percent reduction in dynamic performance which is important when taking a lead fall see below. Any bend tighter than 4 reduces the strength of rope because they stress the rope in flexure the fibers weaker direction. Static strength is most important when rappelling and ropes can have up to a 30 percent strength loss there.

Test 2 is the wet test with figure of eight knots.

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