DeFelsko PosiTest PT Manuel D'instructions page 2

The PosiTest PT Pencil Hardness Test is used to determine the
hardness of a coating by pushing pencils of varying hardness across
the surface, until the coating is scratched or removed. It is also known
as the Wolff-Wilborn Test or Pencil Scratch Test.
The PosiTest PT Pencil Hardness Test Kit can be used to test Pencil
Hardness in accordance with national and international standards
including ISO 15184, ASTM D3363, BS3900-19, JISK 5600-5-4 and
EN 13523-4.
NOTE:
These instructions provide brief summaries of procedures
used to perform the Pencil Hardness Test. Consult and follow the ap-
plicable standard prior to testing.
NOTE:
For the most accurate comparative results, pencils from the
same manufacturer and batch should be used for testing. If pencils
from different manufacturers or different batches will be used, it should
be agreed upon by all interested parties.
Preparing the Samples:
Apply coating to a smooth, rigid metal panel or a similarly hard
substrate and cure properly. When possible, coating should be applied
to a substrate similar to the one that will be used in practice.
Testing should be performed at 23° ± 2°C (73.5 ± 3.5 °F) and a relative
humidity of 50 ± 5% unless otherwise agreed upon by all interested
parties.
NOTE:
If testing in accordance with ISO 15184, test specimens
should be conditioned at the specified temperature and humidity for at
least 16 hours before testing, unless otherwise agreed.
Before testing, place the panel on a firm, horizontal, level surface.
Preparing the Pencils:
Perform the following steps for each pencil prior to testing, or
whenever the pencil is damaged during use.
Introduction
Preparation