Application
The Pencil Hardness Test According Wolff Wilbornprovides in a simple method to test scratch hardness of coatings. In this test,pencils in a range of 8B to 10H hardness-grade are used. The pencil is movedscratching over the surface under a 45 angle with a constant pressure. Then an opticalassessment is carried out to see which pencil hardness damages the surface. Deliveredwith a set of 20 Koh-i-noor pencils sharpener.
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