When a flooring inspector is in the field and looking at carpeting, one of the tests they might perform is measuring the tuft bind. Tuft bind is the force required to pull out a yarn from the backing of a piece of carpet. A higher tuft bind means that the carpet yarn is tightly adhered to the backing. A lower one means that it won’t take as much force to pull a piece away from the backing.
In the field, a flooring inspector can measure it by attaching a tuft to the force gauge using a clamp or hemostat. They will then slowly pull the tuft until the bond breaks. The pull is usually around 12 inches per minute. The flooring inspector should pull at least five samples from different areas of the carpet to get a range of measurements. They will record the ranges and averages to arrive at an accurate tuft binding.