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Tensile Strength: 3,100 lbf. (13.7 kN)
Grams Per Meter: 18.4
Elongation: at 300 lbf. = 2.6%
Elongation: at 600 lbf. = 3.0%
Elongation: at 1000 lbf. = 3.6%
For extremely high strength paired with low elongation and light weight, you can't do much better than the 5 mm Titan Cord from BlueWater Ropes. Make a loop with a triple fisherman's knot and keep on climbing - repetitive flexing won't wear on this abrasion- and cut-resistant rope crafted from a combination of Dyneema high performance fiber and nylon.