Operate
ZSH 2090 Instruction manual
Version 3.6
5.
Determining the degree of hardness
Record each end point for gouge and scratch hardness. With some films, the two
end points will be identical.
gouge hardness:
The degree of hardness of the hardest pencil that will
leave the film uncut for a stroke length of at least 3 mm.
scratch hardness:
(pencil hardness)
The hardest pencil that will not rupture or scratch the film.
Wolff-Wilborn
hardness:
The degree of hardness of the softest pencil which
damages the surface.
Please mention in your test report which standard the measurement results
refer to.
6.
Table with the degree of hardness
The following degrees of hardness are available:
6B 5B 4B 3B 2B B HB F H 2H 3H 4H 5H 6H 7H 8H 9H
softer
harder
page 8
last update: 12.01.2006
