enElcometer 501

Pencil Hardness Tester

Operating Instructions

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is a registered trademark of Elcometer Limited.

All other trademarks acknowledged.
© Copyright Elcometer Limited. 2009 - 2012.
All rights reserved. No part of this Document may be reproduced, transmitted, transcribed, stored (in a retrieval
system or otherwise) or translated into any language, in any form or by any means (electronic, mechanical,magnetic, optical, manual or otherwise) without the prior written permission of Elcometer Limited.
A copy of this Instruction Manual is available for download on our Website via www.elcometer.com.
Doc.No. TMA-0225 Issue 07
Text with Cover No: 4893

Section
12345PageAbout your tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Testing a specimen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Technical specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Related equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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Thank you for your purchase of this Elcometer 501 Pencil Hardness Tester. Welcome to Elcometer.
Elcometer are world leaders in the design, manufacture and supply of inspection equipment for concreteand coatings. Our concrete inspection products include a comprehensive range of concrete, and civilengineering inspection equipment. Our coatings products cover all aspects of coating inspection, fromdevelopment through application to post application inspection.
This Elcometer 501 Pencil Hardness Tester is a world beating product. With the purchase of this productyou now have access to the worldwide service and support network of Elcometer. For more information visit
our website at www.elcometer.com

1 ABOUT YOUR GAUGE
The purpose of the Elcometer 501 Pencil Hardness Tester is to provide a rapid, inexpensive method fordetermination of the comparative scratch resistance and hardness of a coating.
This test is known as the Wolff-Wilborn method. A coated panel is placed on a firm horizontal surface and thepencil is held firmly against the coating, point away from the operator, at a 45° angle. The pencil is then pushed
away from the operator. The hardness of the pencils is increased until one or both of the following defects markthe coating:
1. Plastic deformation; a permanent indentation in the paint surface without cohesive fracture.
2. Cohesive fracture; the presence of a visible scratch or rupture in the surface of the paint film, material
having been removed from the paint film.
The Elcometer 501 Pencil Hardness Tester is designed to use a standard wooden black lead pencil, and issupplied with a full set of fourteen, covering 6H (very hard) to 6B (very soft).

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1.2 STANDARDSThe Elcometer 501 Pencil Hardness Tester can be used in accordance with the following National andInternational Standards: ASTM D 3363, BS 3900-E19, EN 13523-4 supersedes ECCA T4, ISO 15184,
JIS K 5600-5-4.

Note: For ASTM D 3363, the test is started using the hardest pencil and continued down the scale of hardness
to determine the two end points:
1. The pencil that will not cut or gouge the coating
2. The pencil that will not scratch the coating

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1.1 WHAT THE BOX CONTAINS• Elcometer 501 Pencil Hardness Tester• Pencil Set (14 pencils, grades 6H – 6B)• Setting Block• Pencil Sharpener x 2• Abrasive Paper Block• Operating Instructions• Carrying Case
The Elcometer 501 Pencil Hardness Tester is packed in a cardboard and foam package. Please ensure that
this packaging is disposed of in an environmentally sensitive manner. Consult your local Environmental
Authority for further guidance.

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2 TEST PROCEDURE
2.1 BEFORE YOU START
The test should be carried out at 23°C ± 2°C (73.5°F ± 3.5°F) and 50% ± 5% relative humidity, unlessotherwise agreed.
2.2 PREPARE THE PENCIL
1. Prepare the pencil using the special pencil sharpeners supplied.
Use sharpener T99923040-1 for pencils 6H, 5H, 4H, 3H, 2H, H, F, HB, B and 2B.
Use sharpener T99923040-2 for pencils 3B, 4B, 5B and 6B.
Sharpen until approximately 5 mm to 6 mm (0.25") of lead, is exposed taking care to leave theexposed lead unmarked.
2. Hold the pencil at 90° to the abrasive paper and rub the lead until a flat, smooth and circular crosssection is achieved. Ensure that the edge is free of chips or nicks (Figure 1).

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Figure 1. Edge of lead must be free of chips or nicks

4Support the Pencil Tester on the setting
block (Figure 2). Fit the softest pencil,
6B, into the body of the tester, with the tipof the pencil resting on the surface of thepaint film. Lock the pencil in place withThumbscrew
the thumbscrew and then remove thesetting block.
2.4 PREPARE THE SCRATCH
Place the test panel on a level, firm,horizontal surface. Place the Pencil
Direction ofTester with the pencil facing away fromMotion
you and push the Tester a distance of Setting Blockapproximately 6 mm (0.25"). Apply thepush force to the back of the unit,
Figure 2. Using setting block to mount pencil in tester
between the wheels, so as not tocontribute to the load on the pencil. The
speed of the Pencil Tester should be
between 0.5 mm/s to 1 mm/s.
2.5 INSPECT THE SCRATCH
Check the surface for scratches or gouges by either close visual inspection, by feel using a fingernail or, ifagreed, using a microscope with between x6 and x10 magnification.
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2.3 MOUNT PENCIL IN TESTERen

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2.6 CHANGE PENCIL HARDNESS
If no marking has occurred repeat the test (2.2 to 2.5) with the next hardest pencil.
Note: If using the ASTM D 3363 method and the lead has cut through or scratched the surface of thecoating, select the next softest pencil and repeat the test (2.2 to 2.5).
For ASTM D 3363 identify the end point of the test as follows:•Gouge hardness – The hardest pencil that leaves the coating uncut over a stroke length of at least 3mm.

•Scratch hardness – The hardest pencil that will not rupture or scratch the coating.

2.7 REPEAT THE TESTThe test procedure (2.2 to 2.6) should be repeated 12 mm (0.5") away from the first test.
When repeating the test, rotate the pencil to ensure that the edge of the lead in contact with the test panel
is not chipped or crumbled. If necessary the pencil should be prepared again (2.2).
If the two test results differ by more than one unit of pencil hardness, discard the results and repeat the test.

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The following information should be contained in any report on the results of the Pencil Test:•The type of defect resulting from the test; see “About your gauge” on page 2.

•The make and manufacture of the pencils used.

•Any deviation from standard conditions including the temperature and humidity conditions of the test
and the roughness of the coating surface.

•The magnification of the microscope, if one is used.

Note: In some cases the two test end points will be the same.

3 STORAGE AND TRANSITStore the instrument in its case when it is unused for long periods of time, and during transit.

4 MAINTENANCE
The Elcometer 501 Pencil Hardness Tester is designed to give many years reliable service under normal
operating and storage conditions. Special maintenance will not normally be required under these conditions.
An occasional wipe with a dry cloth will help to keep the instrument in good condition.
If dirt or any other contaminant is found on the wheels, it should be removed immediately.
The Hardness Tester does not contain any user-serviceable components. In the unlikely event of a fault,
the Elcometer 501 should be returned to your local Elcometer supplier or directly to Elcometer.

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2.8 TEST REPORTenR

5 TECHNICAL SPECIFICATION
5.1 GAUGE
Overall Dimensions (without pencil fitted):

130 mm x 63 mm x 50 mm (5" x 2.5" x 2")

Overall Dimensions (with pencil fitted):

130 mm x 130 mm x 50 mm (5" x 5" x 2")

Material:

Powder Coated Steel

Weight (tester and pencil):

2.1 kg (4 lb 10¼ oz)

Load Applied by Pencil:

750 g (7.36 N)

5.2 PENCIL SET SUPPLIED WITH NEW INSTRUMENTS.
Pencil Type:

Faber Castell 9000

Quantity:

14Grades:6H, 5H, 4H, 3H, 2H, H, F, HB, B, 2B, 3B, 4B, 5B, 6B

5.3 CARRYING CASE
Material:

Polypropylene foam-lined with cutouts to store 501 Pencil
Hardness Tester and Accessories

Dimensions:

300 mm x 220 mm x 75 mm (11.8" x 8.7" x 3")

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6.1 CONSUMABLE ITEMSThe following items are supplied with the Elcometer 501 Pencil Hardness Tester. Replacements areavailable from your local Elcometer supplier or direct from Elcometer.
Description

Sales Part No.

Replacement Pencil Set:

T99923039

Individual grades of pencil in boxes of 12

See table below for Sales Part No.

Description

Part Number

Description

Part Number

Hardness Pencils 6B

T99923042-1

Hardness Pencils F

T99923042-8

Hardness Pencils 5B

T99923042-2

Hardness Pencils H

T99923042-9

Hardness Pencils 4B

T99923042-3

Hardness Pencils 2H

T99923042-10

Hardness Pencils 3B

T99923042-4

Hardness Pencils 3H

T99923042-11

Hardness Pencils 2B

T99923042-5Hardness Pencils 4H

T99923042-12

Hardness Pencils B

T99923042-6

Hardness Pencils 5H

T99923042-13

Hardness Pencils HB

T99923042-7

Hardness Pencils 6H

T99923042-14

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6.2 REPLACEMENT ITEMSThe following items can be replaced if lost or damaged and can also be obtained your local Elcometer
supplier or direct from Elcometer.
Description

Sales Part No.

Replacement Pencil Sharpener:

T99923040-1 for pencils 6H to 2B
T99923040-2 for pencils 3B to 6B

Setting Block:T50119011

Sandpaper Block

T99923041

7 RELATED EQUIPMENT
In addition to the 501 Pencil Hardness Tester, Elcometer produces a wide range of other Hardness Testing
Equipment. Users of the Elcometer 501 Pencil Hardness Tester may also benefit from the following
Elcometer product ranges:•Elasticity and Resistance Deformation Testers•

Appearance Testers•

Washability, Brushability and Abrasion Testers

For further information contact Elcometer, your local Elcometer supplier or visit www.elcometer.com

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