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7. Measure the width of the cut coating (or coatings) by counting the number of graticule divisions.
To convert the width of the cut coating into coating thickness, multiply the number of graticule divisions by
the resolution given below.
Resolution of graticule
Cutter No.
(microns)
1
20
2
10
3
2
8. In the example given in above, with a No. 3 cutter, the coating thickness is:
34 divisions x 2 = 68 microns, or 34 divisions x 0.08 = 2.7 mils
4.1 MEASURING MULTI-LAYER COATINGS
The thickness of individual layers can be calculated by
measuring each layer.
4.2 IRREGULARITIES
Irregularities can occur if very hard, brittle films, or films with
insufficient adhesion to the substrate are tested. The following
can arise and can be avoided as follows.
8
Maximum thickness
(mils)
(microns)
0.8
2000
0.4
1000
0.08
200
Cutting angle
(degrees)
45
26.6
5.7
0
2
4
6
8
10
12
14
16
18
20
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