This test consists of subjecting the coated surface of the coated glass to rubbing with a felt pad in dry conditions. It is the type of pad, the loading on it and number of strokes that may cause surface degradation.
E.4. The abrasive felt pad shall have the following characteristics:
- a density of 0.52 g/cm2
- a thickness of 10 mm+- 1 mm
- a circle shape with a diameter of
- and is cut or punched in such a way that the intersections of the abrasion surface and the edges are perpendicular.
The pad is fixed to the metal finger. The felt pad shall rotate continuously at 6 rpm or it shall rotate by an angle of between 10 and 30 at the end of each stroke.