BS EN ISO 1518-2:2011 Incorporating corrigendum November 2011
BSI Standards Publication
Paints and varnishes — Determination of scratch resistance Part 2: Variable-loading method (ISO 1518-2:2011)
BS EN ISO 1518-2:2011
BRITISH ST STANDARD ANDARD
National foreword This British Standard is the UK implementation of EN ISO 1518-2:2011. It supersedes BS EN ISO 12137-2:2006, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. © The British Standards Institution 2012 ISBN 978 0 580 77326 6 ICS 87.040
Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2011.
Amendments/corrigenda Amendment s/corrigenda issued since publication Date
Text affected
31 Janury 2012
Implementation of CEN Correction Notice 9 November 2011: Correction of the superseding note in the EN Foreword and title page
EUROPEAN STANDARD
EN ISO 1518-2
NORME EUROPÉENNE EUROPÄISCHE NORM
October 2011
ICS 87.040
Supersedes EN ISO 12137-2:2006
English Version
Paints and varnishes - Determination of scratch resistance - Part 2: Variable-loading method (ISO 1518-2:2011) Peintures et vernis - Détermination de la résistance à la rayure - Partie 2: Méthode à charge variable (ISO 15182:2011)
Beschichtungsstoffe - Bestimmung der Kratzbeständigkeit Teil 2: Verfahren mit kontinuierlich ansteigender Last (ISO 1518-2:2011)
This European Standard was approved by CEN on 14 October 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by t ranslation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN
All rights rights of exploitation in any form and by any any means reserved worldwide for CEN national Members.
Ref. No. EN ISO 1518-2:2011: E
BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
Foreword This document (EN ISO 1518-2:2011) has been prepared by Technical Committee ISO/TC 35 "Paints and varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2012, and conflicting national standards shall be withdrawn at the latest by April 2012. Attention is drawn to the th e possibility that some of the elements of this document docum ent may m ay be the subject of patent pate nt rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 12137-2:2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 1518-2:2011 has been approved by CEN as a EN ISO 1518-2:2011 without any modification.
BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Internationall Electrotechnical Commission (IEC) on all matters of electrotech Internationa electrotechnical nical standardization. standardization. Internationall Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. Internationa The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible responsible for identifying any or all such patent rights. ISO 1518-2 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, varnishes, Subcommittee SC 9, General test methods for paints and varnishes. varnishes . It cancels and replaces ISO 12137-2:1997, which has been technically revised. The main changes are the following: a)
The number of the standard has been changed from ISO 12137-2 to ISO 1518-2 in order to group the scratch-resistance tests under the same number (ISO 1518).
b)
A definition of scratch has been introduce introduced. d.
c)
The supplementary test conditions (formerly Annex A) have been integrated in the test report.
d)
The text has been editorially revised and the normative references have been updated.
ISO 1518 consists of the following parts, under the general title Paints and varnishes — Determination of scratch resistance: resistance:
Part 1: Constant-loading method
Part 2: Variable-loading method
© ISO 2011
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BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
BS EN ISO 1518-2:201 1518-2:2011 1 INTERNATIONAL STANDARD
EN ISO 1518-2:2011 (E)
Paints and varnishes — Determination of scratch resistance — Part 2: Variable-loading method
1
Scope
This part of ISO 1518 specifies a method for determining, using a pointed stylus loaded with a continuously increasing load, the scratch resistance of a single coating of a paint, varnish or related product, or the upper layer of a multicoat system. This test has been found to be useful in comparing the scratch resistance of different coatings. It is most useful in providing relative ratings for a series of coated panels exhibiting significant differences in scratch resistance. Neither this part of ISO 1518 nor ISO 1518-1 specifies a method using a curved stylus, which is specified in ISO 12137. The choice between the three methods will depend on the particular practical problem.
2
Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1513, Paints and varnishes — Examination and preparation of test samples ISO 1514, Paints and varnishes — Standard panels for testing ISO 2808, Paints and varnishes — Determination of film thickness ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
3
Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 scratch, n cut or gouge through the surface of a coating, made by contact with a sharp object
4
Principle
The product or system under test is applied at uniform thickness to flat panels of uniform surface texture. After drying/curing, the scratch resistance is determined using an automatic instrument which pushes the panels beneath a pointed stylus mounted so that it presses down perpendicularly on the surface of the test panel. The load on the test panel is increased continuously until the coating is scratched.
© ISO 2011
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BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
5 5.1
Apparatus Instrument for determining scratch resistance .
A suitable instrument 1 ) is shown in Figure 1. It consists principally of a counterbalanced beam with, mounted at one end, a pointed stylus. The test panel is placed on a sliding table which is motor-driven to move under the stylus at a speed of 10 mm/s. A continuous-loading weight mounted over the beam acts on the beam in such a way that, as the test panel passes under the stylus, the load on the stylus is continuously increased. The stylus-loading range can be varied by changing the continuous-loading weight (weights giving loading ranges of 0 g to 50 g, 0 g to 100 g and 0 g to 200 g are available, for instance). Mounted over the stylus itself is a small scale pan on which weights can be placed to expand the stylus-loading range (adding a weight of 100 g, for instance, changes a 0 g to 200 g loading range to one of 100 g to 300 g).
1) This apparatus is available from Shinto Scientific Co., Ltd, 27 Kanda-higashikonyacho, Kanda-higashikonyacho, Chiyoda-ku, Chiyoda-ku, Tokyo Tokyo 101-0034, Japan. This information is given for the convenience of users of this part of ISO 1518 and does not constitute endorsement by ISO of the apparatus shown. Other types of scratch tester may be used if they can be shown to give similar relative ratings.
2
© ISO 2011
BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
Key
1
cylindrical counterweight
2
continuous-loading weight
3
scale pan
4
sliding table
5
stylus
Figure 1 — Scratch instrument with pointed stylus
5.2 Stylus, Stylus, preferably tipped with a conical sapphire or diamond, the point of which is rounded to a radius of (0,03 0,005) mm (see Figure 2).
© ISO 2011
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BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
Dimensions in millimetres
Key
1
conical sapphire or diamond
2
stylus
Figure 2 — Stylus tipped with conical sapphire or diamond
5.3 Microscope, preferably with a magnification range extending up to Microscope, stylus. It may also be used to inspect the scratched coating. coating.
6
100,
required to examine the
Sampling
Take a representative sample of the product to be tested (or of each product in the case of a multicoat system), as specified in ISO 15528. Examine and prepare each sample for testing, as specified in ISO 1513.
7 7.1
Test panels Substrate
Select the substrate from one of those specified in ISO 1514 and, where possible, in accordance with the desired practical application. The panels shall be plane and free from distortion, with a maximum thickness of about 12 mm, and 100 mm to 400 mm wide and long.
7.2
Preparation and coating
Prepare each test panel in accordance with ISO 1514 and then coat it by the specified method with the product or system under test.
4
© ISO 2011
BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
7.3
Drying and conditioning
Dry (or stove) and age, if applicable, each coated test panel according according to the instructions given for the product or system under test. Before testing, condition the coated panels at (23 2) °C and a relative humidity of (50 5) % for a minimum period of 16 h. The coated panels shall be stored and handled so as to avoid contamination by fingerprints and dust. NOTE
7.4
Fingerprints, dust or other contamination on the surface will result in a lower accuracy.
Thickness of coating
Determine the thickness, in micrometres, of the dried coating by one of the procedures specified in ISO 2808.
8 8.1
Procedure Test conditions
Carry out the test at (23 2) °C and a relative humidity of (50 5) %.
8.2
Preparation for the test
Place the instrument on a stable and level surface. Level the instrument in accordan accordance ce with the manufacturer's manufacturer's instructions. Examine the stylus under the microscope, preferably at a magnification of instrument operation manual, to ensure that it is undamaged.
100,
in accordance with the
Clean the stylus, if necessary necessary,, with a clean cloth or lint-free paper.
8.3
Determination
Place a test panel up against the stop on the sliding table. Secure the panel in place by turning the securing screws evenly about one turn at a time. Secure the stylus in the vertical position. Adjust the counterweights so that, when the tip of the stylus is just touching the surface of the test panel, the load on the stylus is zero. Adjust the height of the stylus to the thickness of the test panel, with the beam released released and the stylus resting on the test panel. Load the stylus at the lowest weight range to be tested, e.g. 0 g to 50 g. Start the instrument at a rate of about 10 mm/s. The instrument shown in Figure 1 will stop automatically when the sliding table has moved 100 mm. Inspect the coating for scratching under a suitable magnification or with the naked eye.
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BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
If no scratching occurs, increase the stylus-loading range, e.g. 0 g to 100 g, and continue in test areas that do not overlap until scratching does occur. When scratching has occurred, determine which type of defect is involved. The defects are defined as follows: a)
Plastic deformation: the permanent indentation of the surface with or without any surface blemish or cohesive fracture.
b)
Surface blemish: blemish: a superficial superficial surface effect caused by a difference difference in the scattering scattering of light light between the the line of test and the adjacent surface.
c)
Surface scratch: a continuous cut or gouge through the surface.
d)
Cohesive fracture: the presence of a visible surface break or rupture.
e)
Combinations of the above.
NOTE
In some cases, one of these types of defect might be of particular importance.
Repeat the determination at least twice (i.e. for a total of at least three determinations) on the same panel at the stylus-loading range at which scratching occurs. For each of the determinations, measure the distance d , in millimetres, from the final-loading point (i.e. the point where the stylus stops moving) to the point where scratching occurs.
9
Expression of results
For each of the determinations carried out, calculate the critical load, which scratching just occurs, using Equation (1): Fc
F c,
expressed in grams, at the point at
100 d Ff F i 100
(1)
where d
is the distance, expressed in millimetres, from the final-loading point to the point where scratching just occurs;
F f
is the final load, expressed in grams, in the stylus-loading range selected;
F i
is the initial load, expressed in grams, in the stylus-loading range selected.
NOTE film.
Some instruments use a scratch-intensity recorder to determine the load which causes scratching of the paint
Calculate the mean critical load for the three determinations made on the test panel. Report the result to the nearest 1 g.
10 Precision No relevant precision data are currently available.
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BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
11 Test report The test report shall contain at least the following information: information: a)
all details necessary to identify the product tested;
b)
a reference to this part of ISO 1518 (ISO 1518-2:2011);
c)
all details on preparation of the test panels, including 1)
the material (including thickness thickness)) and surface preparation of the substrate (see 7.1 and 7.2),
2)
the method method of application of the test coating coating to the the substrate substrate (see 7.2),
3)
the duration and conditions of drying (or stoving) and ageing (if applicable) of the coating before testing (see 7.3),
4)
the thickness, in micrometres, of the dry coating and method of measurement in accordance with ISO 2808, and whether it is a single coating or a multicoated system (see 7.4);
d)
the temperature temperature and and relative humidity during during the test, if different different from those those specified specified in 8.1; 8.1;
e)
the type of apparatus used;
f)
the dimensions of the stylus used;
g)
whether scratching scratching was assessed assessed using the naked eye eye or a microscope and, and, if a microscope microscope was used, the magnification setting at which it was used;
h)
the test results: 1)
a descripti description on of those of the elements of scratching defined in 8.3 which actually occurred (not all will necessarily necessaril y occur),
2)
the mean critical load, expressed in grams, at which each of these elements of scratchi scratching ng occurred, as specified in Clause 9;
i)
any deviation from the test method specified;
j)
any unusual unusual features (anomalies) (anomalies) observed during the test;
k)
the date of the test.
© ISO 2011
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BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
Bibliography
[1]
ISO 1518-1, Paints and varnishes — Determination of scratch resistance — Part 1: Constant-loading method
[2]
ISO 12137, Paints and varnishes — Determination of mar resistance
8
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BS EN ISO 1518-2:2011 EN ISO 1518-2:2011 (E)
© ISO 2011
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