Hardness Test Pencil - Senze-Instruments Benelux

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Process & Quality Control

Hardness Test Pencil

Coatings & Industry > Physical properties > Hardness

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


Technical Data:

Compression Springs: spring steel

Marking pins

  • 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

Scratch Hardness Testing
Gash/metal marking according to Oesterle, 3 test disks: Steel, copper, thermo-set plastic,
3 load available : 0–3 N/0–10 N/0–20 N

Mar Tester Model 435
Adhesion and Resistance Tester Model 435 S

Model 435
                             
Gashes and mars are not nice to look at, especially not on smooth, shiny paint surfaces.
But they can occur quite quickly: fingernails can unintentionally scratch over a matt-polished table.
Or, a branch can grind across the beautiful paint of a Cadillac.
The mar is often from a small cause but can leave a big mess!
Metal marking is another type of mar. Here, the culprits are small metal particles of coins or similar which "rub off", thereby leaving ugly scratches on the surface.
Previously you could "inspect" a surface only with your fingernails.
Now for the first time, the Model 435 Mar tester enables you to specifically define the behaviour of coating surfaces with an exact test value.

Scars on surfaces are unsightly, especially on smooth, glossy surfaces. Surfaces can be ruined so easily - for example marks on the matt polished
surface of a table, by a fingernail, or on the shiny bodywork of a Cadillac, by a twig. Great annoyance can result from such small causes.
Marks can also be caused by metallic objects. The culprits may be metal particles from coins, cutlery or rings on fingers. Any of these can mar surface finishes.

The traditional test for the resistance of surfaces to such damage was to try to mark the surface with a fingernail. With the Mar Tester, Model 435, the quality of the surface can be measured accurately.
Design and Function
The scaring tool in the form of a disc, with locking facility, made of special plastic or metal, is mounted on a screw and is under pressure from a helical spring. This applies to a force which is adjustable from 0 to 20 N. The instrument is placed onto the surface so that it rests on the two guide wheels and the marking wheel which is locked in position then presses onto the surface with the pre-set force from the spring. The range of spring forces available is divided into three sections, each covered by one of three exchangeable springs:
Test range 1:  0 -   3 N  -  Sensitivity  0,1 N
Test range 2:  0 - 10 N  -  Sensitivity  0,5 N
Test range 3:  0 - 20 N  -  Sensitivity  1,0 N.

Note:
The test discs will wear at the point at which they are used. After 100 tests the discs should therefore be moved round so as to bring a point about 2 mm further along on the periphery into operation. The point at which the marking disc is first used should be marked by a scratch.

Scope of supply : Mar Tester according to Oesterle, Model 435
Including
♦ 3 test discs (duroplast, copper, steel)
♦ 3 force springs
♦ 1 case
       


Model 435 S
                                      
In principle, the Model 435 S is suitable for testing the adhesion of almost all printed scales, numbers, inscriptions and markings.

When used as an adhesion tester e.g. the coloured coating  applied to  the dial of a speedometer in the shape of raised numbers, points or scale lines, is tested concerning its adhesion to the substrate, by lateral slipping with a defined “blunt” test body geometry, with a preselected test force.

When used as a scratch resistance tester for testing surfaces against “blunt”  effects, it is recommended for testing surfaces on which the Hardness Test Rod 318 is still too “aggressive” – even using the largest tip diameter of 1 mm available for this purpose.
Design and Function
The scaring tool in the form of a disc, with locking facility, made of special plastic or metal, is mounted on a screw and is under pressure from a helical spring. This applies to a force which is adjustable from 0 to 20 N. The instrument is placed onto the surface so that it rests on the two guide wheels and the marking wheel which is locked in position then presses onto the surface with the pre-set force from the spring. The range of spring forces available is divided into three sections, each covered by one of three exchangeable springs:
Test range 1:  0 -   3 N  -  Sensitivity  0,1 N
Test range 2:  0 - 10 N  -  Sensitivity  0,5 N
Test range 3:  0 - 20 N  -  Sensitivity  1,0 N.

Note:
The test discs will wear at the point at which they are used. After 100 tests the discs should therefore be moved round so as to bring a point about 2 mm further along on the periphery into operation. The point at which the marking disc is first used should be marked by a scratch.
Hardness Test Pencil 318
Hadness Test Pencil
Order number: 101-0020.01.31
incl. test tip no. 1 (acc. to Bosch; 0,75 mm Ø) and 3 springs
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Hardness Test Pencil 318 S
Hadness Test Pencil
Order number: 101-0273.01.31
with rolling head, incl. test tip no. 1 (acc. to Bosch; 0.75 mm Ø) and 3 springs
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Special head for use Model 318 in connection with film applicator COATMASTER 510 MC
Hadness Test Pencil
Order number: 101-0708.01.32
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Test tip no. 2
Hadness Test Pencil
Order number: 101-0428.03.32
Test tip no. 2 (acc. to ISO 1518 and GME 60280 (Ø 1.0 mm)
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Test tip no. 3
Hadness Test Pencil
Order number: 101-0428.04.32
Test tip no. 3 (acc. to van Laar; 0.5 mm Ø)
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Test tip no. 4
Hadness Test Pencil
Order number: 101-0428.01.32
Test tip no. 4 (acc. to Opel; 0.5 mm Ø)
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Test tip no. 1
Hadness Test Pencil
Order number: 101-0428.02.32
Test tip no. 1 (acc. to Bosch (Ø 0,75 mm) for scratch test acc. to BMW GS 97034-9)
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Spring 0 - 3 N
Hadness Test Pencil
Order number: 101-0429.01.32
Spring 0 - 3 N blue marked
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Spring 0 - 10 N
Hadness Test Pencil
Order number: 101-0429.02.32
Spring 0 - 10 N red marked
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Spring 0 - 20 N
Hadness Test Pencil
Order number: 101-0429.03.32
Spring 0 - 20 N yellow marked
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Test tip (Ø 3 mm) for scratch inclination test acc. to BMW GS 97034-8
Hadness Test Pencil
Order number: 101-0428.05.32
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Test head „C“ (movable/retrofit) for models 318/318 S, for using the Clemen test tip
Hadness Test Pencil
Order number: 101-2109.01.32
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)
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Test tip acc. to Clemen (R 1.0 mm)
Hadness Test Pencil
Order number: 101-0218.02.32
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Special head (for use Model 318 in connection with film applicator COATMASTER 510)
Hadness Test Pencil
Order number: 101-0769.01.32

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Chucking adapter (rolling) for fixing and vertical guidance of the Hardness Test Pencil
Hadness Test Pencil
Order number: 101-1972.01.32



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Handle for the chucking adapter
Hadness Test Pencil
Order number: 101-1969.02.32
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.
-

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Hardness Test Pencil, Model 318 C (Clemen)
Hadness Test Pencil
Order number: 101-0314.01.31
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


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