1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Plastics - Poly(vinyl chloride) (PVC) based profiles - Determination of the appearance after exposure at 150 CBS EN 478:2018National forewordThis British Standard is the UK implementation of EN 478:2018. It supersedes B
2、S EN 478:1999, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics.A list of organizations represented on this committee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
3、provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 94814 5ICS 83.080.20; 83.140.99Compliance with a British Standard cannot confer immunity from legal obligations.This British Stand
4、ard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 478:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 478January 2018ICS 83.080.20; 83.140.99 Supersedes
5、EN 478:1995EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN 478:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national Me
6、mbersPlastics - Poly(vinyl chloride) (PVC) based profiles - Determination of the appearance after exposure at 150 CPlastiques - Profils base de poly(chlorure de vinyle) (PVC) - Caractrisation de laspect aprs conditionnement 150 CKunststoffe - Profile auf Basis von Polyvinylchlorid (PVC) - Bestimmung
7、 des Erscheinungsbildes nach Lagerung bei 150 CThis European Standard was approved by CEN on 6 December 2017.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 altera
8、tion. 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 b
9、y translation 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,
10、Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN 478:201
11、8 (E)European foreword 31 Scope . 42 Normative references 43 Terms and definitions . 44 Principle 45 Apparatus . 46 Test specimen 47 Test procedure 48 Expression of results 59 Test report .52Contents PageBS EN 478:2018EN 478:2018 (E)European forewordThis document (EN 478:2018) has been prepared by T
12、echnical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by NBN.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 July 2018, and conflicting national standards shall be withdrawn a
13、t the latest by July 2018.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN not be held responsible for identifying any or all such patent rights.This document supersedes EN 478:1995.According to the CEN/CENELEC Internal Regulat
14、ions, 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Ital
15、y, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.3BS EN 478:2018EN 478:2018 (E)1 ScopeThis European Standard specifies a method for determining the effect of heat on unplasti
16、cized poly(vinyl chloride) (PVC-U) profiles, to be carried out in air at 150 C.It is also applicable to PVC-based profiles at specified temperatures/test conditions.2 Normative referencesThere are no normative references in this document.3 Terms and definitionsFor the purposes of this document, the
17、following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1defectvisual appearance of blisters
18、 cavities or cracks on any of the surfaces (inner and outer) of the profile and of any delamination in the cross section4 PrincipleA test specimen of a specified length of profile is maintained in an oven at 150 C for 30 min and is inspected visually on the inside, outside and the cross-section of
19、the wall for defects after heating.5 Apparatus5.1 Ventilated oven, thermostatically controlled, with air circulation, in which the test specimens can be exposed to a temperature of 150 C.The oven shall be equipped with a thermostat capable of maintaining the temperature at (150 3) C and a support sy
20、stem which keeps the specimen in position and enables heat transfer.NOTE The use of talc or PTFE foil can be convenient to avoid sticking.The capacity of the oven shall be such that, after insertion of the test specimen, the test temperature is regained within 15 min.6 Test specimenThe test specimen
21、 shall have a minimum length of 200 mm of profile.7 Test procedure7.1 Set the oven temperature to 150 C.7.2 When the oven has reached 150 C, place the test specimen horizontally in the oven.4 BS EN 478:2018EN 478:2018 (E)7.3 Maintain the test specimen in the oven for (30 ) min, measuring from the ti
22、me when the oven temperature has returned to 150 C.7.4 Remove the test specimen from the oven, taking care not to distort or otherwise damage it.7.5 Allow the test specimen to cool in air. When the test specimen is cool enough for handling, examine it for defects.8 Expression of resultsThe nature an
23、d the location of any defects shall be noted.9 Test reportThe test report shall include the following information:a) reference to this document (i.e. EN 478);b) the test laboratory;c) full identification of the profile;d) the date of testing;e) the apparatus used;f) the results of the examination of
24、 the test specimen;g) all operating details not specified in this document, as well as any incidents likely to have influenced the results.5BS EN 478:2018This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, in
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