1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1844:2013Flexible sheets forwaterproofing Determination of resistanceto ozone Plastic and rubbersheets for roof waterproofingBS EN 1844:2013 BRITISH STANDARDNational forewo
2、rdThis British Standard is the UK implementation of EN 1844:2013. Itsupersedes BS EN 1844:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/546, Flexible sheets for waterproofing and watervapour control.A list of organizations represented on this c
3、ommittee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80227 0ICS 91.100
4、.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2013.Amendments issued since publicationDate Text affectedBS EN 1844:2013EUROPEAN STANDARD NORME EUROPEN
5、NE EUROPISCHE NORM EN 1844 May 2013 ICS 91.100.50 Supersedes EN 1844:2001English Version Flexible sheets for waterproofing - Determination of resistance to ozone - Plastic and rubber sheets for roof waterproofing Feuilles souples dtanchit - Dtermination de la rsistance lozone - Feuilles dtanchit de
6、toiture plastiques et lastomres Abdichtungsbahnen - Verhalten bei Ozonbeanspruchung - Kunststoff- und Elastomerbahnen fr Dachabdichtungen This European Standard was approved by CEN on 28 March 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditi
7、ons 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 i
8、n 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 as the official versions. CEN members are the national standar
9、ds 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slove
10、nia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide fo
11、r CEN national Members. Ref. No. EN 1844:2013: EBS EN 1844:2013EN 1844:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Principle 5 4 Apparatus .5 5 Sampling .5 6 Test specimens 5 7 Conditioning .6 8 Test conditions 6 9 Procedure .7 10 Expression of results 7
12、11 Precision of test method .7 12 Test report 8 Bibliography 9 BS EN 1844:2013EN 1844:2013 (E) 3 Foreword This document (EN 1844:2013) has been prepared by Technical Committee CEN/TC 254 “Flexible sheets for waterproofing”, the secretariat of which is held by NEN. This European Standard shall be giv
13、en the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2013, and conflicting national standards shall be withdrawn at the latest by November 2013. Attention is drawn to the possibility that some of the elements of this document m
14、ay 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 1844:2001. This document has been technically and editorially revised in order to correct the ozone concentration. This document has been pr
15、epared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croati
16、a, 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, Spain, Sweden, Switzerland, Turkey and the
17、 United Kingdom. BS EN 1844:2013EN 1844:2013 (E) 4 Introduction This European Standard is intended for characterisation of plastic and rubber sheets as manufactured or supplied before use. This test method relates exclusively to products or to their components where appropriate, and not to waterproo
18、fing membrane systems composed of such products and installed in the works. This test is intended to be used in conjunction with European Standards for plastic and rubber sheets for waterproofing. BS EN 1844:2013EN 1844:2013 (E) 5 1 Scope This European Standard specifies a method for the determinati
19、on of the resistance of plastic and rubber sheets for waterproofing to cracking when exposed, under static tensile strain, to air containing a definite concentration of ozone and at a definite temperature without the effects of direct light. 2 Normative references The following documents, in whole o
20、r in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13416, Flexible sheets for waterproofin
21、g Bitumen, plastic and rubber sheets for roof waterproofing Rules for sampling ISO 1431-1, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static and dynamic strain testing 3 Principle Test specimens are exposed under elongation in a closed chamber, at a defined relative hum
22、idity and temperature, to an atmosphere containing ozone. After exposure, the presence or absence of cracks is determined. 4 Apparatus The apparatus used shall be in accordance with ISO 1431-1. The test chamber shall also be controlled for relative humidity. 5 Sampling Samples shall be taken in acco
23、rdance with EN 13416. 6 Test specimens Test specimens shall have an undamaged test surface. Ozone resistance shall not be assessed on surfaces that have been cut or buffed. Comparisons of different materials are only valid if the cracking is assessed on surfaces of similar finish produced by the sam
24、e method. Test specimens shall consist of strips of not less than 10 mm width and length not less than 40 mm between the grips before stretching; the thickness is equal to the thickness of the sheets. The ends of the test specimen held in the grips may be protected with an ozone resistant lacquer. C
25、are shall be taken in selecting a lacquer to ensure that the solvent used does not appreciably swell the membrane. Silicone grease shall be used. Alternatively, the test specimen may be provided with modified ends, for example by the use of lugs, to enable it to be extended without causing excessive
26、 stress concentration and breakage at the grips during ozone exposure. At least three test specimens shall be used. BS EN 1844:2013EN 1844:2013 (E) 6 7 Conditioning 7.1 Conditioning in the unstrained state For all test purposes, the minimum time between manufacturing of the finished product and stra
27、ining the test specimens shall be 16 hours. For non-product test, the maximum time between manufacturing of the finished product and straining the test specimens shall be 4 weeks. For product tests, wherever possible, the time between manufacturing of the finished product and straining the test spec
28、imens shall not be more than 3 months. In other cases, tests shall be made within 2 months of the date of the receipt of the product by the customer. Test specimens and samples shall not, between the time of manufacturing of finished product and insertion in the cabinet, be allowed to come into cont
29、act with membranes of a different composition. This is necessary to prevent additives, which may affect the development of ozone cracks from migrating by diffusion from one membrane to adjacent membranes. It is recommended that aluminium foil is placed between test specimens and sheets of different
30、compositions, but any other method, which prevents migration of additives, can be used. Samples and test specimens shall be stored in the dark, in an essentially ozone-free atmosphere during the period between manufacturing of the finished product and stretching. The normal storage temperature in ac
31、cordance to ISO 23529 should be the standard temperature of (23 2) C. These storage conditions should be used, as far as possible, for products. For evaluations intended to be comparable, the storage time and conditions shall be identical. For thermoplastic rubbers, the storage period shall begin im
32、mediately after shaping. 7.2 Conditioning in the strained state After stretching, the test specimens shall be conditioned for a period between 48 h and 96 h in an essentially ozone-free atmosphere in the dark. The temperature for this conditioning shall be the standard temperature of (23 2) C. The t
33、est specimens shall not be touched or otherwise disturbed in any way during the conditioning period. For tests to be comparable, the conditioning time shall be the same. 8 Test conditions 8.1 Ozone concentration The test shall be carried out at an ozone concentration of (200 20) pphm by volume. NOTE
34、 It has been found that differences in atmospheric pressure can influence ozone cracking when test pieces are exposed to constant ozone concentrations expressed in parts per million. This effect can be taken into account by expressing the ozone content in the ozonised air in terms of the partial pre
35、ssure of ozone, i.e. in millipascals, and making comparisons at constant ozone partial pressures. At standard conditions of atmospheric pressure and temperature (101 kPa, 273 K), a concentration of 1 pphm is equivalent to a partial pressure of about 1 mPa. Further guidance is given in ISO 1431-1. 8.
36、2 Temperature The test shall be carried out at a temperature of (40 2) C. BS EN 1844:2013EN 1844:2013 (E) 7 8.3 Relative humidity The test shall be carried out at a relative humidity of (65 5) %. 8.4 Exposure time Place the strained test pieces, suitably conditioned, in the ozone chamber for (168 2)
37、 h. 8.5 Elongation The test shall be carried out with test specimens stretched to an elongation of (20 2) %. In the case of reinforced finished product, there may be difficulty in achieving the required/specified elongation due to deformation in the test specimen or restriction in reinforcement move
38、ment. In the case of reinforced sheeting, the test specimens can be skived or cut, but not buffed, to remove the reinforcement, or moulded without the reinforcement. One of the following methods is recommended to produce a suitable test specimen: a) When using a test specimen from the reinforced fin
39、ished product, stretch the test specimen in an appropriate direction, maybe diagonally, in order to achieve the required/specified elongation. b) Carefully remove the reinforcement without damaging the elastomeric surface. 9 Procedure Strain the test specimens at 20 % elongation and condition them i
40、n accordance with 7.2. Adjust the rate of flow and temperature of the ionised gas and its ozone concentration to that required and place the strained test specimen in the test chamber. Maintain the test conditions at the required levels. The lens may either be mounted in a window in the chamber wall
41、, or the test specimens may be removed from the chamber for a short period, in their clamps. The test specimens shall not be handled or bumped when carrying out the examination. Finally examine the test specimen after a (168 2) h exposure period. NOTE Cracks propagating from edges that originate fro
42、m the preparation by the punching die are to be ignored. 10 Expression of results Report the results as no cracking or cracking. 11 Precision of test method No information is available at this time. BS EN 1844:2013EN 1844:2013 (E) 8 12 Test report The test report shall contain at least the following
43、 information: a) reference to this European Standard (EN 1844); b) all details necessary to identify the product tested; c) number of test specimens tested; d) method of preparation of test pieces; e) whether a rotating carrier was used; f) air flow rate; g) whether cracking occurred; if required, t
44、he nature of the cracking may also be given; h) any non-standard procedures or any peculiarities encountered during testing; i) date(s) of testing. BS EN 1844:2013EN 1844:2013 (E) 9 Bibliography 1 ISO 1431-3, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 3: Reference and alte
45、rnative methods for determining the ozone concentration in laboratory test chambers 2 ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods This page deliberately left blankThis page deliberately left blankBSI is the independent national body respo
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