version 3.8
ZSH 2090 Instruction manual
Operate
last update: 24.07.2015
page 9
5.
Handling
The test needs to be carried out under laboratory conditions.
In the different standards, the test is carried out differently. Hereunder,
the procedure is described when starting with a hard pencil or lead.
Please note that the procedure might have to be carried out in the
reverse order of succession!
•
If necessary prepare the pencil ZSH 2090 as described in chapter 4.1
“Pencil preparation” on page 7.
•
Insert the first pencil into the as described in chapter 4.2 “Inserting the
pencils” on page 8.
•
Place the ZSH 2090 on the coating under test.
The test surface needs to be flat.
•
Hold the instrument by the wheel hubs and push forward at a speed of
5-10 cm/s for a distance of at least 7 mm (cf. arrow).
•
Examine the test surface with the naked eye for indentation or
scratching.
•
Repeat the process down the hardness scale until a pencil is found that
will not cut the film to the substrate (either metal or a previous coat)
for a distance of at least 3 mm.
•
Continue the process until a pencil is found that will neither cut nor
scratch the surface of the film (any defacement other than a cut or
gouge is considered a scratch.
at least 7 mm
