ALTANA Pencil Hardness Tester - Manual (Page 6)

4
Pencil.Hardness.Tester.(Wolf.Wilburn)
1.0.Introduction
This instrument offers an easy to use method for the
determination of film hardness for a coating applied
to a flat substrate, by means of drawing pencil leads
of known hardness at a constant applied mass
across the coated surface.
2.0.Specifications
The Pencil Tester complies with the requirements
of ISO 15184, ECCA-T4 /1. In order to achieve
consistent results it is recommended that the test
be conducted in accordance with the stated test
methods.
3.0.Preparation.for.Test
The following instruction will provide the user with a
working knowledge of how to conduct the test.
These notes should be read in conjunction with the
stated test methods in order to obtain meaningful
results that can be used for comparative purposes.
3.1 Select a pencil from the range, remove
approximately 5 to 6 mm of wood from the
point using the special Pencil Sharpener, being
careful to leave an undisturbed, unmarked,
smooth cylinder of pencil lead.
3.2 The tip of the pencil shall be squared by
holding the pencil in a vertical position and
moving the pencil back and forth over the
abrasive paper, whilst maintaining an angle of
90°. Continue until a flat, smooth, circular
cross-section is obtained, free from chips or
nicks in the edges.
3.3 Repeat procedure 3.1 & 3.2 each time a pencil
is used.
3.4 Place the coated panel to be tested on a level,
firm horizontal surface.