SANS 2409-2008 Paints and varnishes - Cross-cut test《油漆及清漆 划格试验》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21214-8 SANS 2409:2008Edition 2ISO 2409:2007Edition 3SOUTH AFRICAN NATIONAL STANDARD Paints and varnishes Cross-cut test This national sta

4、ndard is the identical implementation of ISO 2409:2007 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27

5、 12 www.stansa.co.za Standards South Africa SANS 2409:2008 Edition 2 ISO 2409:2007 Edition 3 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA SC 5140.11I, Paints and varnishes Test methods, in accordance with procedures of

6、 Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was published in May 2008. This SANS document supersedes SANS 2409:1992 (edition 1 and nat. amdt 1). Reference numberISO 2409:2007(E)ISO 2007INTERNATIONAL STANDARD ISO2409Third edition2007-05-15Paints and var

7、nishes Cross-cut test Peintures et vernis Essai de quadrillage SANS 2409:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2409:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing pol

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10、to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. Unless otherwise specified, no part of this pub

11、lication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Gen

12、eva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedSANS 2409:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2409:2007(E) ISO 2007 All ri

13、ghts reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Apparatus 2 4 Sampling 5 5 Test panels 5 6 Procedure 5 7 Supplementary test conditions . 8 8 Evaluation and expression of results. 8 9 Precision 9 10 Test report . 10 Bibliography . 11 SANS 2409:2008This s tandard ma

14、y only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2409:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing

15、 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 liais

16、on with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of te

17、chnical 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 dr

18、awn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2409 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test method

19、s for paints and varnishes. This third edition cancels and replaces the second edition (ISO 2409:1992), which has been technically revised. The main changes are: the requirements for the adhesive tape have been changed; precision data have been added. SANS 2409:2008This s tandard may only be used an

20、d printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 2409:2007(E) ISO 2007 All rights reserved 1Paints and varnishes Cross-cut test 1 Scope This International Standard describes a test method for assessing the resistance of paint coatings to separation f

21、rom substrates when a right-angle lattice pattern is cut into the coating, penetrating through to the substrate. The property measured by this empirical test procedure depends, among other factors, on the adhesion of the coating to either the preceding coat or the substrate. This procedure is not to

22、 be regarded, however, as a means of measuring adhesion. Where a measurement of adhesion is required, attention is drawn to the method described in ISO 4624. NOTE 1 Although the test is primarily intended for use in the laboratory, the test is also suitable for field testing. The method described ma

23、y be used either as a pass/fail test or, where circumstances are appropriate, as a six-step classification test. When applied to a multi-coat system, assessment of the resistance to separation of individual layers of the coating from each other may be made. The test can be carried out on finished ob

24、jects and/or on specially prepared test specimens. Although the method is applicable to paint on hard (e.g. metal) and soft (e.g. wood and plaster) substrates, these different substrates need a different test procedure (see Clause 6). The method is not suitable for coatings of total thickness greate

25、r than 250 m or for textured coatings. NOTE 2 The method, when applied to coatings designed to give a rough patterned surface, will give results which will show too much variation (see also ISO 16276-2). 2 Normative references The following referenced documents are indispensable for the application

26、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 samples for testing ISO 1514, Paints and varnishes Standard

27、panels for testing ISO 2808, Paints and varnishes Determination of film thickness ISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling IEC 60454-2, Specificatio

28、n for pressure-sensitive adhesive tapes for electrical purposes Part 2: Methods of test SANS 2409:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2409:2007(E) 2 ISO 2007 All rights reserved3 Apparatus 3.1 General Use ordinary laborato

29、ry apparatus, together with the apparatus specified in 3.2 to 3.6. 3.2 Cutting tool 3.2.1 General requirements It is particularly important to ensure that the cutting tool has a defined shape and that the cutting edges are in good condition. Suitable tools are described in 3.2.2 and 3.2.3 and shown

30、in Figures 1a) and 1b). A single-blade cutting tool (3.2.2) is the preferred tool in all cases, i.e. with all kinds of coating on both hard and soft substrates. The multi-blade cutting tool (3.2.3) is not suitable for thick ( 120 m) or hard coatings or where the coating is applied over soft substrat

31、es. The tools described in 3.2.2 and 3.2.3 are suitable for manual use and, although this is the more usual method of use, the tool may be mounted on a motor-driven apparatus which gives more uniform cutting. The application of the latter procedure shall be subject to agreement between the intereste

32、d parties. 3.2.2 Single-blade cutting tool A single-blade cutting tool shall have a 20 to 30 edge and a blade thickness of ( )0,030,030,43+mm as shown in Figure 1a). When the cutting edge has worn to 0,1 mm it shall be reground. 3.2.3 Multi-blade cutting tool A multi-blade cutting tool shall have si

33、x cutting edges spaced 1 mm, 2 mm or 3 mm apart see Figure 1b). The width across the six cutting edges, a, shall be 5 mm for a tool which has a cutting-edge spacing of 1 mm, and 10 mm for a tool which has a cutting-edge spacing of 2 mm. When the cutting edge has worn to 0,1 mm it shall be reground.

34、The guide edges and the cutting edges shall lie on the same diameter. 3.3 Guiding and spacing edges In order to space the cuts correctly, a series of guiding and spacing edges is necessary when using a single-blade cutting tool. A suitable apparatus is shown in Figure 2. SANS 2409:2008This s tandard

35、 may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2409:2007(E) ISO 2007 All rights reserved 3Dimensions in millimetres, except where indicated otherwise a) Single-blade cutting tool b) Multi-blade cutting tool Key 1 cutting edges a width across all six c

36、utting edges aRegrind when cutting edge has worn to 0,1 mm. bGuide edges and cutting edges lie on same diameter. cDirection of cut. Figure 1 Cutting tools SANS 2409:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2409:2007(E) 4 ISO 20

37、07 All rights reservedKey 1 ten spacing edges 1 mm thick 2 laminated moulding plastic or steel 3 rubber Figure 2 Series of spacing edges 3.4 Soft brush 3.5 Pressure-sensitive adhesive tape Unless otherwise agreed, adhesive tape with an adhesive strength between 6 N per 25 mm width and 10 N per 25 mm

38、 width (determined in accordance with IEC 60454-2) shall be used. The tape shall be at least 50 mm wide. NOTE Transparent tape is recommended. 3.6 Viewing lens Use a hand-held lens with a magnification of 2 or 3. SANS 2409:2008This s tandard may only be used and printed by approved subscription and

39、freemailing clients of the SABS .ISO 2409:2007(E) ISO 2007 All rights reserved 54 Sampling Take a representative sample of the product to be tested, as described in ISO 15528. Examine and prepare each sample for testing, as described in ISO 1513. 5 Test panels 5.1 Substrate Unless otherwise agreed,

40、select the substrate from one of those described in ISO 1514. The panels shall be plane and free from distortion. The dimensions shall be such as to allow the test to be carried out at three different positions not less than 5 mm from each other or from an edge of the panel. Where panels consist of

41、a relatively soft material such as wood, the minimum thickness shall be 10 mm. Where panels consist of a hard material, the minimum thickness shall be 0,25 mm. NOTE 1 Rectangular panels, measuring approximately 150 mm 100 mm, have been found to be convenient. NOTE 2 In cases where the panel is made

42、of wood, the direction and the structure of the grain can influence the test, and a pronounced grain will render the evaluation impossible. 5.2 Preparation and coating Unless otherwise agreed, prepare each test panel in accordance with ISO 1514 and then coat it by the specified method with the produ

43、ct or system under test. 5.3 Drying Dry (or stove) and age (if applicable) each coated test panel for the specified time and under the specified conditions. 5.4 Thickness of coating Determine the thickness, in micrometres, of the dried coating by one of the procedures specified in ISO 2808. Make the

44、 measurement at, or as near as possible to, the positions at which the cross-cut is to be made. The number of thickness determinations is dependent on the method used. 6 Procedure 6.1 General 6.1.1 Test conditions and number of tests Carry out the test at a temperature of (23 2) C and a relative hum

45、idity of (50 5) %, unless otherwise agreed (see ISO 3270). In field tests, the ambient conditions will have to be accepted. 6.1.2 Conditioning of the test panels Unless otherwise specified, condition the test panels immediately prior to the test at a temperature of (23 2) C and a relative humidity o

46、f (50 5) % for a minimum of 16 h. SANS 2409:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2409:2007(E) 6 ISO 2007 All rights reserved6.1.3 Number of cuts The number of cuts in each direction of the lattice pattern shall be six. 6.1.

47、4 Spacing of cuts The spacing of the cuts in each direction shall be equal and shall depend on the thickness of the coating and on the type of substrate as follows: up to 60 m: 1 mm spacing, for hard (e.g. metal) substrates; up to 60 m: 2 mm spacing, for soft (e.g. wood and plaster) substrates; 61 m

48、 to 120 m: 2 mm spacing, for both hard and soft substrates; 121 m to 250 m: 3 mm spacing, for both hard and soft substrates. The spacing of the cuts shall conform to the hardness of the substrate and the coating. 6.1.5 Number of determinations Carry out the test in at least three different places (s

49、ee 5.1) on the panel (see also Clause 8). If the results do not match, the differences being more than one classification unit, repeat the test at three other places, if necessary using different panels, and record all the results. 6.2 Cutting and removing the coating using the manual procedure 6.2.1 Place the test panel on a rigid, flat surface to prevent any deformation of the panel during the test. 6.2.2 Before the test, inspect the cutting edge of the blade and maintain its condition