Tool with six blades

Reg43 Rev2 Ann3 fig 24

13.3. Test Method
Cut through the coating on to the subsurface a pattern with 6 cuts and perpendicular to this, another one so that a grid with 25 squares arises (grid-cut).
The cutting tool should be drawn steadily with a speed of 2 to 5 cm/s so that the cuts reach the subsurface but do not penetrate too deeply.
The cutting is conducted in such a way that the two leading heads at the edge of the apparatus touch the surface uniformly. After the test the cuts are examined with a magnifying glass to check that they reach the subsurface. The test is carried out at least at two different positions of the sample. After the cuts have been produced they are brushed 5 times with slight pressure in both diagonal directions with a hand brush with polyamide bristles.
13.4. Interpretation of results
The grid cuts are examined with a magnifying glass. If the cut edges are perfectly smooth and if no part of the coating is detached then it will be given a cross cut value of Gt0. If there are small fragments detached at the intersection of the cuts and if the exposed area amounts to about 5 per cent of the grid area the cut value is Gt1.
Larger areas of detachment will be graded in the range Gt2 to Gt5.