Year1
r< Trolley Pencil Hardness Tester
Measuring Angle: Degree
Determination grade: grade (B) standard Zhonghua brand hardness test pencil (B).
Weight: about
Load: (three weights)
&< Trolley pencil hardness tester
The pencil should be planed , graphite protruding approx. This requirement can be achieved using a special pencil sharpener from the special range included in the scope of delivery. Hold the pencil vertically with the graphite facing down against the sandpaper (fine grain size) to smooth the graphite core and sharpen the edge.
Clamp the pencil in the instrument so that the pencil protrudes, and then place the instrument on the surface of the sample. Grasp the crank handle with your thumb and index finger and slide it across the pattern plate at a speed of approximately c/.
Selecting a pencil of appropriate hardness depends on experimentation. It is recommended to start with a medium soft pencil or a medium hard pencil and gradually work out which pencil works best for you.
During testing, be careful not to confuse pencil marks and penetration marks. If necessary, use a damp sponge or a soft eraser to erase excess line marks.
The numbers of the two types of pencils are marked by pencil hardness. The hardness of the pencil means, for example, that the pencil can leave writing marks on the surface and the pencil can slightly scratch the paint film. The paint film hardness is .
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