1、BSI Standards PublicationBS EN 13523-14:2014Coil coated metals Test methodsPart 14: Chalking (Helmen method)BS EN 13523-14:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 13523-14:2014. It supersedes BS EN 13523-14:2001 which is withdrawn.The UK participati
2、on in its preparation was entrusted to Technical Committee STI/21, Surface preparation of steel.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 respons
3、ible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 80215 7ICS 17.040.20; 25.220.60Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of th
4、e Standards Policy and Strategy Committee on 30 June 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 13523-14:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13523-14 June 2014 ICS 25.220.60 Supersedes EN 13523-14:2001English Version Coil coated metals -
5、 Test methods - Part 14: Chalking (Helmen method) Tles prlaques - Mthodes dessai - Partie 14: Farinage (mthode Helmen) Bandbeschichtete Metalle - Prfverfahren - Teil 14: Kreiden (Verfahren nach Helmen) This European Standard was approved by CEN on 7 May 2014. CEN members are bound to comply with the
6、 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
7、 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status a
8、s the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Ne
9、therlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All
10、rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13523-14:2014 EBS EN 13523-14:2014EN 13523-14:2014 (E) 2 Contents Page Foreword 3 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Principle 6 5 Apparatus and materials .6 6 Sa
11、mpling .6 7 Test specimens 6 8 Procedure .6 8.1 General 6 8.2 Checking the adhesive tape .6 8.3 Calibration 7 8.4 Measurement 7 9 Expression of results 7 10 Precision .7 11 Test report 7 Bibliography 8 BS EN 13523-14:2014EN 13523-14:2014 (E) 3 Foreword This document (EN 13523-14:2014) has been prepa
12、red by 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 December 2014, and conflicting national stand
13、ards shall be withdrawn at the latest by December 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13
14、523-14:2001. The main changes are: a) the text was editorially revised and the normative references were updated; b) in 8.4.2 rubbing with a finger as an alternative to rubbing with the plastic spatula for an optimum adhesion between the tape and the coating was added. EN 13523, Coil coated metals T
15、est methods, consists of the following parts: Part 0: General introduction Part 1: Film thickness Part 2: Gloss Part 3: Colour difference Instrumental comparison Part 4: Pencil hardness Part 5: Resistance to rapid deformation (impact test) Part 6: Adhesion after indentation (cupping test) Part 7: Re
16、sistance to cracking on bending (T-bend test) Part 8: Resistance to salt spray (fog) Part 9: Resistance to water immersion Part 10: Resistance to fluorescent UV radiation and water condensation Part 11: Resistance to solvents (rubbing test) Part 12: Resistance to scratching Part 13: Resistance to ac
17、celerated ageing by the use of heat Part 14: Chalking (Helmen method) Part 15: Metamerism BS EN 13523-14:2014EN 13523-14:2014 (E) 4 Part 16: Resistance to abrasion Part 17: Adhesion of strippable films Part 18: Resistance to staining Part 19: Panel design and method of atmospheric exposure testing P
18、art 20: Foam adhesion Part 21: Evaluation of outdoor exposed panels Part 22: Colour difference Visual comparison Part 23: Colour stability in humid atmospheres containing sulfur dioxide Part 24: Resistance to blocking and pressure marking Part 25: Resistance to humidity Part 26: Resistance to conden
19、sation of water Part 27: Resistance to humid poultice (Cataplasm test) Part 29: Resistance to environmental soiling (Dirt pick-up and striping) According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Stan
20、dard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Sp
21、ain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 13523-14:2014EN 13523-14:2014 (E) 5 1 Scope This Part of EN 13523 describes the procedure for determining objectively the chalking resulting from natural or artificial weathering of an organic coating on a metallic substrate. The advanta
22、ge of this procedure for measuring chalking of an organic coating is that the result can be read off immediately on an instrument. Subjective judgement by visual comparison of test specimens with reference specimens is not necessary. Reproducible results can only be obtained by careful execution of
23、the test. Special attention is paid to the adhesive tape and its application to the test surface. The test method is not applicable to embossed coatings. In the case of textured coatings, the degree of texture will influence readings. Also dirt collection can influence readings on outdoor weathered
24、specimens. NOTE Different methods for assessing chalking are in use. The results of these different methods are not comparable. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated refere
25、nces, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13523-0:2014, Coil coated metals Test methods Part 0: General introduction EN 13523-10, Coil coated metals Test methods Part 10: Resistance to fluorescen
26、t UV radiation and water condensation EN 13523-19, Coil coated metals Test methods Part 19: Panel design and method of atmospheric exposure testing EN 23270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing (ISO 3270) EN 60454-2, Pressure-sensitiv
27、e adhesive tapes for electrical purposes Part 2: Methods of test (IEC 60454-2) EN ISO 2813, Paints and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 and 85 (ISO 2813) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13
28、523-0:2014 and the following apply. 3.1 chalking appearance of a loosely adherent powder on the surface of a film or coat arising from the degradation of one or more of its constituents SOURCE: FprEN ISO 4618:2014, 2.41 BS EN 13523-14:2014EN 13523-14:2014 (E) 6 4 Principle Following the Helmen metho
29、d, a piece of transparent adhesive tape is placed on the test surface and rubbed with a plastic spatula or a finger until there is optimum adhesion. Then the rubbed adhesive tape is removed and its transparency measured. Two types of apparatus can be used, one giving a direct reading for chalking, t
30、he other one measures transmission which is converted to chalking as follows: x % transmission is equivalent to (100 x) % chalking. 5 Apparatus and materials 5.1 Portable chalking apparatus, giving a direct reading for chalking, commercially available such as the Helmen chalking tester, or 60 glossm
31、eter or multi-angle glossmeter with 60 adjustment, in accordance with EN ISO 2813, both with chalking adaptor. The type of light detector can influence the readings. A silicon photocell is therefore recommended. NOTE Differences in the light path between the light source and the photocell can influe
32、nce readings. 5.2 Transparent pressure-sensitive adhesive tape, 25 mm wide, with an adhesion strength of (10 1) N per 25 mm width when tested in accordance with EN 60454-2, and checked as described in 8.2. 5.3 Plastic spatula, typically of 25 mm width, with a smooth surface. 6 Sampling See EN 13523-
33、0. 7 Test specimens See EN 13523-0, EN 13523-10, and EN 13523-19. 8 Procedure 8.1 General Measure the chalking of the organic coating at ambient temperature. For more accurate tests, as required for instance in case of dispute, the ambient temperature shall be (23 2) C and the relative humidity (50
34、5) %, in accordance with EN 23270. As dirt collection can influence readings, outdoor weathered test specimens shall be measured after gentle cleaning of the area to be measured. The cleaning procedure shall be agreed between the interested parties but shall not remove any degradation products. 8.2
35、Checking the adhesive tape Measure the transmission of the adhesive tape (5.2) on an appropriate support. If the transmission is less than 90 %, that roll of adhesive tape shall not be used. BS EN 13523-14:2014EN 13523-14:2014 (E) 7 8.3 Calibration Calibrate the apparatus by applying a new piece of
36、adhesive tape (5.2) onto the appropriate support and adjust the reading to be equivalent to 100 % transmission. Then remove the adhesive tape. 8.4 Measurement 8.4.1 Do not wipe or touch the test surface unless otherwise specified or agreed for the cleaning, as in the case of outdoor weathered specim
37、ens. 8.4.2 Apply a new piece of adhesive tape (5.2) of length about 30 mm to the flat test surface and rub with the plastic spatula (5.3) or a finger until there is optimum adhesion between the tape and the coating (as seen by the glossy, transparent appearance of the applied tape). 8.4.3 Remove the
38、 piece of tape carefully and uniformly from the test surface in a single movement and apply it to the support of the measuring instrument (5.1). Then take the reading. 9 Expression of results Express the result as a percentage of chalking. Values below 10 % chalking shall be expressed as “no chalkin
39、g”. 10 Precision No precision data are currently available. 11 Test report The test report shall contain at least the following information: a) all details necessary to identify the product tested; b) a reference to this part of EN 13523 (EN 13523-14); c) the history of the test specimen (e.g. wheth
40、er natural or artificial weathering); d) in the case of outdoor exposed test specimens: the cleaning procedure and whether dirt is present; e) the description of the measuring instrument used; f) the results of the test, as indicated in Clause 9; g) any deviation from the test method specified; h) a
41、ny unusual features (anomalies) observed during the test; i) the date of the test. BS EN 13523-14:2014EN 13523-14:2014 (E) 8 Bibliography 1 EN 1396, Aluminium and aluminium alloys - Coil coated sheet and strip for general applications Specifications 2 EN 10169, Continuously organic coated (coil coat
42、ed) steel flat products Technical delivery conditions 3 EN ISO 4628-6, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 6: Assessment of degree of chalking by tape method (ISO 4628-6) 4 FprE
43、N ISO 4618:2014, Paints and varnishes Terms and definitions (ISO/FDIS 4618:2014) 5 T. Helmen: Kreidungsmessung und Kreidungsbeurteilung (Measurement and judgement of chalking), farbe + lack 84 (1978), 5, p. 315322 (This article also reports results of comparative testing by means of DIN 53159 and AS
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