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How is the minimum breaking strength of a rope determined?

April 26, 2017breaking minimum Rope strength

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How is the minimum breaking strength of a rope determined?

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The actual breaking strength of any individual rope is determined by pulling the rope at a slow, steady rate in a straight line, to the point of destruction. The rated minimum breaking strength of a rope is determined using the “3 sigma” method. This means the minimum breaking strength is calculated by taking the mean or average breaking strength of 5 rope samples, and subtracting 3 standard deviations. Statistically, this creates a confidence level of 99.87% that any sample of rope will actually be stronger than the quoted minimum breaking strength.