Erichsen293 Pencil Hardness Tester with 6B-9H Hardness pencil

Erichsen293

Pencil Hardness Tester

Introduction

Erichsen293 pencil scratches belong to one of the scratch hardness testing instruments. This is a simple and quick way to test the hardness of a coating by scratching it on the surface with sharp edges or other rough surfaces. It can also be used in the production process, such as coil coating.

Test principle

Pencils of different hardness grades move on the surface of the paint film with a force of about 7.5±0.1 N at an angle of 450 to the horizontal. The hardness of a pencil is determined by two hardness scales, the softer one will produce a write mark and the other will create a noticeable scratch on the coating.

Design and functionality

The Erichsen293 pencil Hardness Tester makes the test technically Wolff-Wilborn compliant, ensuring that the force and angle remain constant throughout the test. The instrument is simple to operate and excludes pencil pressure from being manipulated. A set of test pencils consists of 17 hardness grades from 6B~9H.

Test Steps

1. The pencil should be planed with a graphite protrusion of about 5 mm, which can be achieved with a special pencil planer included in the scope of delivery. Hold the pencil vertically and face down against the sandpaper (grain fineness 400) to smooth the graphite core with sharp edges.

2. Clamp the pencil in the instrument, the pencil protrudes 5mm, and place the instrument on the surface of the sample. Grasp the axle with your thumb and forefinger and push the instrument on the sample at a speed of approximately 10 cm/s.

3. Choosing the right pencil for hardness is a matter of experimentation. It is advisable to start with a medium-soft pencil or a medium-hard pencil and gradually find the right pencil.

4. During the test, be careful not to mess up the pencil marks and penetrations. If necessary, use a damp sponge or a soft eraser to wipe off any excess thread marks.

5. The numbers of both pencils are marked by pencil hardness. The hardness of the pencil, e.g. 2H... 3H means that the 2H pencil can leave a mark on the surface, and the 3H pencil can slightly scratch the paint film.

Meets standards

ISO 15184、NEN 5350、SNV 37113、SIS 184187、ECCA T4。

Packing list：

[Note]Because the manufacturer's packaging may be updated or upgraded, the detailed packaging list shall be subject to the latest standard configuration of the manufacturer.