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)

1 Diamond test tip :

Ref : 101-02180132 455.00
413-318 Diamond test tip acc. to DIN EN 438-2 and ISO 4586-2 (with 90 degree included angle and 90 µm radius on the point).

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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)

1 Diamond test tip :

Ref : 101-02180132 455.00
413-318 Diamond test tip acc. to DIN EN 438-2 and ISO 4586-2 (with 90 degree included angle and 90 µm radius on the point).

Total length: 160 mm

Diameter: 16 mm

Weight, net: approx. 250 g

318 C Test Procedure Order ref.

318 C

The hardness test rod, model 318 C can be equipped with two types of sharp-edged tool: With the test tip in accordance to Clemen as well as with the test tip for cross hatch cutting.

The vertical positioning is achieved by the use of the rolling chucking adapter with handle (lockable).

The pointer finger of the guiding hand presses directly onto the rolling chucking adapter and ensures by that the preset test force, whereas the rest of the hand just guides the testing performance by pulling the handle.

The three nylon wheels provide the corresponding stability for the vertical placement and guidance. Fig. Model 318 C with chucking adapter and handle

An existing hardness test pencil 318 can easily retrofitted by separately ordered test head, test tips, chucking adapter and handle.

Test Procedure using Test tips

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.

Three scales are engraved into the test pencil for the three pressure ranges:

0 - 3 N (blue marked)
0 - 10 N (red marked)
0 - 20 N (yellow marked).

The springs for each of the pressure ranges are colour coded and the corresponding scale is marked in the same colour.

A basic requirement to gain useful results is a sensitive guidance of the test pencil.

If the pressure exerted onto the surface is too high, it is possible that the outer edge of the test head produces a trace falsifying the results or rendering their interpretation difficult.

Especially when using imitations with an edge of the test head that is not sufficiently smooth, this effect sometimes led to inappropriate scepticism with regard to the test method in general.

Ref 101-0314.01.31

Hardness Test Pencil, Model 318 C 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

Ref 101-21090132

Test head „C“ (movable/retrofit) for models 318/318 S for using the Clemen test tip

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)

Ref 101-02180232

Test tip acc. to Clemen (R 1.0 mm) (short shaft with flat clamping area)

Ref 101-05640132

Test tip for cross hatch cutting (30°) additionally covered with an extremly hard layer (short shaft with flat clamping area)

Ref 101-19720132

Chucking adapter (rolling) for fixing and vertical guidance of the ERICHSEN Hardness Test Pencil, Model 318, in standard version as well as with test head “C” and test tip “Clemen” – without hardness test pencil

Ref 101-19690232

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.

Ref 101-04290132 Spring 0 - 3 N

Ref 101-04290232 Spring 0 - 10 N

Ref 101-04290332 Spring 0 - 20 N

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

435 Design

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

435 S Design

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

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:

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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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

1,294.--

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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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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 (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 tip acc. to Clemen (R 1.0 mm)

Hadness Test Pencil

Order number: 101-0218.02.32

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Test tip for cross hatch cutting

Hadness Test Pencil

Order number: 101-05640132
Test tip for cross hatch cutting (30°) additionally covered with an extremly hard layer
(short shaft with flat clamping area)

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Diamond test tip

Hadness Test Pencil

Order number: 101-02180132
Diamond test tip acc. to DIN EN 438-2 and ISO 4586-2
(with 90 degree included angle and 90 µm radius on the point).

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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 head „318“

Hadness Test Pencil

Order number: 101-30070132
Test head „318“ for using test tips no. 1 up to no. 4 and test tip for writing
inclination test acc. to BMW

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Rolling test head „318 S“

Hadness Test Pencil

Rolling test head „318 S“ usable with:
- test tips no. 1 up to no. 4 and
- test tip for writing inclination test acc. to BMW

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Rolling test head „435“

Hadness Test Pencil

Order number: 101-30120132
Rolling test head „435“ for using test discs made of Duroplast, Copper and Stainless Steel

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Rolling test head „435 S“

Hadness Test Pencil

Order number: 101-30120232
Rolling test head „435 S“ for using a test tool made of Steel

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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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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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