German erichsen318 hardness test rod Hardness pen 0.75mm (Bosch)

Test principle

A slider allows setting of estimated or known spring pressure. Place the erichsen318 hardness test rod vertically on the test surface and draw a 5~10 mm straight line at a speed of 10 mm/sec. The test head will produce a scratch that is only visible to the naked eye. If the spring pressure is too high, the scratches will be clear; if the spring pressure is too low, no scratches will appear. The required pressure in Newtons can be controlled at a time by locking the slider.

The erichsen 318 hardness test rod is designed to measure the hardness of protective coatings. The hardness of paint films and plastic coatings can be accurately measured and recorded by the 318 type hardness test rod. The measuring surface can be flat or curved, regardless of size.

The scale engraved on the pen includes 3 pressure ranges: 

0-3 N (blue mark) 

0-10 N (red mark) 

0-20 N (yellow mark)

Each erichsen318 hardness test rod and the spring corresponding to the pressure range have a color code corresponding to the scale.

Maintenance and repair 

A clean instrument produces clean test results. To clean, loosen the nut and remove the scale pen. Clean the stem and hole with a soft cloth. In addition, the instrument requires no further maintenance.

Although the erichsen318 hardness test rod has a strong structure, the test head cannot withstand large impact forces. The packaging box that comes with the instrument provides such a protective function. When not in use, the slider should be set to zero to preserve spring accuracy.

Hardness pen × 1, Spring × 3, Encasement box

[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.