Measure the hardness of a coating or paint with the scratch of a pencil

Years ago, the well-proven ERICHSEN hardness test pencil 318 has been significantly
improved in the form of the parallel available version 318 S, with a rolling test head for
scratch testing on sensitive surfaces.
The head is equipped with two little rubber hooped guide wheels. This ensures that even if
the user exerts unindentedly too much pressure onto the test pencil, only the test tip used will
still leave a trace on the test surface.

The degree of hardness of paint films, plastic coatings, etc. can be accurately measured
and recorded with the Hardness Test Pencil Models; 318, 318 S and 318 C, no matter
whether on a level or curved surface, small or large. The instrument is always ready for use
and, because of it’s small size easy transportable, an asset which will be appreciated
by all concerned with hardness tests.

Uniform hardness and quality of the coating facilitate smooth-running manufacture.
Deviation from a specified hardness causes rejects, delay in production and complaints.
Developed by Robert Bosch GmbH of Stuttgart and manufactured by ERICHSEN, the
instrument permits regular quality control of protective coatings, even during processing.

Standards:

• Bosch
• ISO
• van Laar
• Opel