1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Plastics Poly(vinyl chloride) (PVC) based profiles Determination of heat reversionBS EN 479:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 479 January 2018 ICS 83.080.20; 83.140.99 Supersedes EN 479:1995Englis
2、h Version Plastics - Poly(vinyl chloride) (PVC) based profiles - Determination of heat reversion Plastiques - Profils base de poly(chlorure de vinyle) (PVC) - Dtermination du retrait chaud Kunststoffe - Profile auf Basis von Polyvinylchlorid (PVC) - Bestimmung des Wrmeschrumpfes This European Standa
3、rd 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 alteration. Up-to-date lists and bibliographical references concerning s
4、uch 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 translation under the responsibility of a CEN member into its o
5、wn 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, Former Yugoslav Republic of Macedonia, France, Germany,
6、 Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITE
7、E FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 479:2018 ENational forewordThis British Standard is the UK implementation of EN 479:2018. It sup
8、ersedes BS EN 479:1999, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics.A list of organizations represented on this committee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 n
9、ecessary 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 94815 2ICS 83.080.20; 83.140.99Compliance with a British Standard cannot confer immunity from legal obligations.This Brit
10、ish Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 479:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 479 January 2018 ICS 83.080.20; 83.140.99
11、Supersedes EN 479:1995English Version Plastics - Poly(vinyl chloride) (PVC) based profiles - Determination of heat reversion Plastiques - Profils base de poly(chlorure de vinyle) (PVC) - Dtermination du retrait chaud Kunststoffe - Profile auf Basis von Polyvinylchlorid (PVC) - Bestimmung des Wrmesch
12、rumpfes This 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 alteration. Up-to-date lists and bibliograph
13、ical 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 translation under the responsibilit
14、y 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, Former Yugoslav Republic of
15、 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. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORM
16、ALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 479:2018 EBS EN 479:2018EN 479:2018 (E) 2 Contents Page European for
17、eword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Principle . 4 5 Apparatus . 4 6 Test specimens . 4 7 Conditioning 4 8 Procedure. 5 9 Expression of results 5 10 Test report . 5 BS EN 479:2018EN 479:2018 (E) 3 European foreword This document (EN 479:2018) has been prepared b
18、y Technical 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 withdra
19、wn at 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 479:1995. According to the CEN/CENELEC Internal
20、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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Irelan
21、d, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 479:2018EN 479:2018 (E) 4 1 Scope This European Standard specifies a method for determining the heat reversion
22、of unplasticized poly(vinyl chloride) (PVC-U) profiles at 100 C in air. It is also applicable to PVC-based profiles at specified temperatures/other test conditions. 2 Normative references There are no normative references in this document. 3 Terms and definitions No terms and definitions are listed
23、in this document. 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/obp 4 Principle A test specimen of a specified length of prof
24、ile is maintained in an oven at 100 C for 1 h. A marked length of this test specimen is measured under identical conditions, before and after heating in the oven. The heat reversion is calculated as the percentage change of the final length relative to the initial length per pair of marks. 5 Apparat
25、us 5.1 Air oven, thermostatically controlled, with forced air circulation, in which the test specimens can be exposed to a temperature of 100 C. The oven shall be equipped with a thermostat capable of maintaining the temperature at (100 3) C and a support system which keeps the specimen in position
26、and enables heat transfer. NOTE The use of talc or PTFE foil can be convenient to avoid sticking. 5.2 Measuring device, to measure the length of the test specimen to an accuracy of 0,1 mm. 6 Test specimens 6.1 The test specimen shall be of a minimum length of 250 mm of profile. 6.2 Prepare three sim
27、ilar test specimens per length of profile. 7 Conditioning Condition the test specimens for at least 1 h at room temperature. In cases of dispute the test specimens shall be conditioned at (23 2) C. BS EN 479:2018EN 479:2018 (E) 5 8 Procedure 8.1 Using, a scriber or similar implement, trace on each t
28、est specimen two marks, perpendicular to the profile axis, 200 mm apart, so that one of them is approximately 25 mm from one end of the test specimen. 8.2 Measure for every test specimen at room temperature the distance between the two marks in one pair with an accuracy of 0,1 mm. 8.3 Set the oven t
29、emperature to 100 C. 8.4 When the oven has reached 100 C, place the test specimens horizontally in the oven on the support system. 8.5 Maintain the test specimens in the oven for (6030+) min, after the temperature has regained to 100 C. 8.6 Remove the support system with the test specimens from the
30、oven and let them cool down in air to room temperature on the support system. Under identical conditions to those used in 8.2, measure the distance between the two marks per pair. 8.7 In cases of dispute the cooling of the profiles and the measuring of the distance between the marks shall be perform
31、ed at (23 2) C. 9 Expression of results For each test specimen, calculate the heat reversion R for each pair of marks, as a percentage using the following formula 0100LRL= where L = L0 L1; L0is the distance between the marks before heating in the oven in millimetres; L1is the distance, between the m
32、arks, after heating in the oven in millimetres. Where relevant, calculate for each test specimen the difference of the values of the heat reversion, R, expressed as a percentage, between the two opposing surfaces, as defined in the referring standard. 10 Test report The test report shall include the
33、 following information: a) reference to this document (i.e. EN 479); b) the test laboratory; c) full identification of the profile; BS EN 479:2018EN 479:2018 (E) 6 d) the date of testing; e) the distance between the marks before heating in the oven (L0) for each pair of marks of each test specimen;
34、f) the distance between the marks after heating in the oven (L1) for each pair of marks of each test specimen; g) the value R for each pair of marks for each test specimen; h) the difference of the values of the heat reversion, R, for each test piece, where relevant; i) all operating details not spe
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