Quick Answer
Cordage quality can be evaluated using various testing methods such as cord strength, knot strength, and resistance to abrasion and water. The best testing methods include reverse wrap testing and cord strength testing. These methods assess a cord's ability to withstand stress and strain.
Reverse Wrap Testing
Reverse wrap testing is a method used to evaluate a cord’s resistance to abrasion and stress. To conduct a reverse wrap test, wrap a cord around a stationary object, such as a tree branch or a metal rod, with a set number of wraps, typically 10-15. Then, pull the cord tight while maintaining the wraps and observe for signs of wear or failure.
Cord Strength Testing
Cord strength testing is used to evaluate a cord’s ability to withstand tension. To conduct a cord strength test, attach the cord to a load-bearing device, such as a pulley or a scale, and gradually increase the load until the cord fails. Record the maximum load the cord can withstand and compare it to its breaking strength. This method helps determine a cord’s suitability for various applications.
Measuring Cord Strength
Measuring cord strength can be done using a variety of methods, including tensile testing and drop testing. Tensile testing involves measuring the force required to break a cord, while drop testing involves measuring the cord’s ability to withstand repeated impacts. For example, a cord used for rock climbing may require a tensile strength of at least 200 pounds per square inch (psi), while a cord used for camping may require a tensile strength of at least 100 psi.
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