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29.2.1 Contrast medium, e.g, graphite, talcum, or solution of dye in alcohol, to contrast with the colous of the sheet under test.
29.3.1 Scratch testing apparatus, (see Figure 18), consisting of the following parts:
29.3.1.5 Hemispherical diamond scratching point, with a point radius of (0,090 ± 0,003) mm and an included angle of (90 ± 1) degree (see Figure 19). (The diamond shall be mounted in the holder with the flat part on the leading side of the shank facing the working direction.)
NOTE 3 This is an example of a suitable product that is available commercially. This information is given for the convenience of users of this part of ISO 4586 and does not constitute and endorsement by ISO of this product.
29.3.1.6 Clamping disc, to keep the test specimen flat
29.3.2 Viewing enclosure, having a matt black interior and a light source (defined below) located at the top. Its dimensions shall be such that the test specimen is located vertically below the light source and at a distance of 600 mm. An aperture in the front shall allow inspection of the test specimen at various angles from a distance of (400 ± 10) mm. A diagram of a suitable enclosure is shown in Figure 20.
Place the diamond point on the table of the electronic balance (see 29.3.4) and, with arm in a horizontal position, verify that the position marks for sliding weight correspond to the load values shown in Table 4. If not, move weight as necessary to achieve the correct loads, and mark the correct positions on arm.
Table 4 ---- Load values
Position mark | 1,0 N | 2,0 N | 4,0 N | 6,0 N |
Load (grams force) | 102 +/- 1 | 204 +/- 1 | 408 +/- 1 | 612 +/- 1 |
29.5 Test specimen
Table 5. See Figure 21 for further explanation:
Table 5 --- Scratch resistance rating scale
Discontinuous scratches, or slight surface scratches,
or no visible marks
|
≥90% of continuous double circles clearly visible traces |
|
level 5 |
6 N |
|
level 4 |
4 N |
6 N |
level 3 |
2 N | 4 N |
level 2 |
1 N | 2 N |
level 1 |
-- | 1 N |