Hardness Test Pencil, Model 318
For the Measuremen of the Hardness of Protective Coatings
The degree of hardness of paint films, plastic coatings, etc. can be accurately measured and recorded with the Hardness Test Pencil, Models 318 and 318 S, 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.
The handling of the Hardness Test Pencil is extremely simple.
The estimated or known spring tension is set with the help of the slider. Holding the instrument upright and placing its point on the test surface one draws a 5 to 10 mm long line at a rate of approximately 10 mm/sec.
The stylus should produce a scratch which is just visible with the naked eye. If the spring pressure is too high, the scratch is clearly visible; if too low, no scratch appears. The applied pressure, fixed by locking the slider, is marked in Newtons
3 Pressure Ranges:
0 - 3 N (blue marked)
0 - 10 N (red marked)
0 - 20 N (yellow marked)
4 Test Geometries:
0.75 mm (Bosch)
1.0 mm (ISO)
0.5 mm (van Laar)
0.5 mm (Opel)
Hardness Test Pencil, Model 318 S with rolling head
For the Measurement of the Hardness of Protective Coatings
Compression Springs: spring steel
nos. 1, 2 and 3: tungsten carbide spheres
no. 4 spring steel, with special tip geometry
Stylus point dia:
no. 1 0.75 mm (Bosch)
no. 2 1.0 mm (technically equivalent to ISO 1518)
no. 3 0.5 mm (van Laar)
no. 4 0.5 mm (Opel)
Total length: 160 mm
Diameter: 16 mm
Weight, net: approx. 250 g
incl. test tip no. 1 (acc. to Bosch; 0,75 mm Ø) and 3 springs
with rolling head, incl. test tip no. 1 (acc. to Bosch; 0.75 mm Ø) and 3 springs
Test tip no. 2 (acc. to ISO 1518 and GME 60280 (Ø 1.0 mm)
Test tip no. 3 (acc. to van Laar; 0.5 mm Ø)
Test tip no. 4 (acc. to Opel; 0.5 mm Ø)
Test tip no. 1 (acc. to Bosch (Ø 0,75 mm) for scratch test acc. to BMW GS 97034-9)
Spring 0 - 3 N blue marked
Spring 0 - 10 N red marked
Spring 0 - 20 N yellow marked
Attention: Requires a Clemen test tip as well as a chucking adapter (rolling – for fixing and vertical guidance of the Hardness Test Pencil) and handle (anti-slip grip)
Handle for the chucking adapter adaptable anti-slip grip made of aluminium with engraved grid pattern, with freely rotating axis for constant force application. When using Model 318 C, the rotation function has to be locked.
Hardness Test Pencil, Model 318 C (Clemen) incl. test tip acc. to Clemen (R Ø 1 mm), chucking adapter (rolling – for fixing and vertical guidance of the Hardness Test Pencil), handle (anti-slip grip) and 3 springs