A circular sample is rubbed against the same fabric or wool abrasive fabric in a Lissajous pattern trajectory under a defined pressure. The sample is free to rotate around a central axis perpendicular to the sample plane. After a defined rubbing phase, the sample is evaluated for abrasion, pilling, or felting by means of a visual description.
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The sample fixture pins are inserted into the axle sleeve fixed to the guides and placed in the center of each grinding table. Each sleeve is equipped with two bearings. The pin is free to move within the sleeve without clearance.
The abrasion, pilling, and felting properties of the samples are evaluated separately by eye in accordance with ISO 12945-4. If the parties concerned agree, additional evaluations can be carried out with instruments.
i) for each stage, the average number of grades of abrasion, pilling, and felting (modified to the nearest half grade) of the surface changes associated with the specimens evaluated according to ISO 12945-4 (and when evaluated according to the apparatus) and the associated stage (number of rubs).
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