Purity Metric
Fiber measurement protocols quantify the weight or count percentage of guard hairs remaining in a dehaired wool or cashmere batch. This measurement, known as coarse hair content, determines the commercial classification of refined animal fiber. Excessive amounts of thick hair reduce the softness of the final garment.
Fabric Degradation
Coarse fibers in yarn degrade the hand feel of the finished knitwear. Because these fibers do not bend easily, they protrude from the yarn surface and cause skin irritation. This prickle effect ruins the soft texture that consumers expect from luxury knitwear.
Laboratory Verification
Counting coarse fibers requires trained technicians to examine sample slides under a projection microscope or via automated image analysis. In a typical test, fibers with a diameter exceeding thirty micrometers are classified as coarse. The technician counts several thousand fibers to obtain a statistically valid percentage.
This test ensures the batch complies with international trading standards. The automated optical fiber diameter analyzer captures individual fiber profiles to calculate this percentage rapidly.
Contract Settlement
Purchasing agreements establish strict financial penalties or rejection thresholds for batches that exceed the specified limit of coarse hair content. If the analysis reveals high contamination, the buyer can demand a discount or refuse the entire lot. Spinning mills rely on these test certificates to protect their downstream knitting operations from fiber defects.
