1、March 2017 English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.040.70!%bV_“2635160www.din.deDI
2、N EN ISO 7326Rubber and plastics hoses Assessment of ozone resistance under static conditions (ISO 7326:2016);English version EN ISO 7326:2016,English translation of DIN EN ISO 7326:2017-03Gummi und Kunststoffschluche Bestimmung der Ozonbestndigkeit unter statischen Bedingungen (ISO 7326:2016);Engli
3、sche Fassung EN ISO 7326:2016,Englische bersetzung von DIN EN ISO 7326:2017-03Tuyaux en caoutchouc et en plastique valuation de la rsistance lozone dans des conditions statiques (ISO 7326:2016);Version anglaise EN ISO 7326:2016,Traduction anglaise de DIN EN ISO 7326:2017-03SupersedesDIN EN ISO 7326:
4、200910www.beuth.deDocument comprises 17 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.02.17 DIN EN ISO 7326:2017-03 2 A comma is used as the decimal marker. National foreword This document (EN ISO 7326:2016) has been prepared
5、 by Technical Committee ISO/TC 45 “Rubber and rubber products” in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was DIN-Normenausschuss Elastomer-Technik (D
6、IN Standards Committee Elastomer Technology), Working Committee NA 045-02-12 AA Gummi- und Kunststoffschluche sowie Schlauchleitungen (Spiegelgremium zu CEN/TC 218; ISO/TC 45/SC 1). The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 1431-1
7、:2012 E DIN ISO 1431-1:2016 ISO 23529 DIN ISO 23529 ISO 8330 DIN EN ISO 8330 Amendments This standard differs from DIN EN ISO 7326:2009-10 as follows: a) the standard has been editorially and technically revised; b) in Clause 2, the latest edition of ISO 1431-1 has been cited; c) three terms have be
8、en added; d) in Subclause 5.5, the cylinder for method 4 has been newly described; e) in Subclause 6.1.1, the formula has been corrected; f) in Subclause 9.4.1, the test method has been revised; g) a Bibliography has been added. Previous editions DIN EN 27326: 1993-07 DIN EN ISO 7326: 2009-10 DIN EN
9、 ISO 7326:2017-03 3 National Annex NA (informative) Bibliography E DIN ISO 1431-1, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static and dynamic strain testing DIN ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods
10、DIN EN ISO 8330, Rubber and plastics hoses and hose assemblies Vocabulary DIN EN ISO 7326:2017-03 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7326 October 2016 ICS 23.040.70 Supersedes EN ISO 7326:2008English Version Rubber and plastics hoses - Assessm
11、ent of ozone resistance under static conditions (ISO 7326:2016) Tuyaux en caoutchouc et en plastique - valuation de la rsistance lozone dans des conditions statiques(ISO7326:2016) Gummi- und Kunststoffschluche - Bestimmung der Ozonbestndigkeit unter statischen Bedingungen(ISO7326:2016) This European
12、 Standard was approved by CEN on 9 October 2016. 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 concer
13、ning 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 responsibility of a CEN member into
14、 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 Macedonia, France, Ge
15、rmany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE
16、FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7326:2016 EForeword . 4Introduction .51 Scope . 62 Normative references 63 Terms and definitions .
17、 64 General considerations 65 Apparatus . 76 Test pieces . 76.1 Type of test piece 76.1.1 Method 1 . 76.1.2 Method 2 . 76.1.3 Method 3 . 76.1.4 Method 4 . 86.1.5 Method 5 . 86.2 Number of test pieces . 87 Conditioning of test pieces . 88 Test conditions . 89 Procedure. 89.1 Method 1. 89.2 Method 2.
18、99.3 Method 3. 99.4 Method 4109.5 Method 51110 Test report 12Bibliography .13Contents PageEN ISO 7326:2016 (E) DIN EN ISO 7326:2017-03 2European foreword .3European foreword This document (EN ISO 7326:2016) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products“ in collaborat
19、ion with Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” the secretariat of which is held by BSI. 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 April 2017, and con
20、flicting national standards shall be withdrawn at the latest by April 2017. 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 docum
21、ent supersedes EN ISO 7326:2008. According to the CEN-CENELEC Internal 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 R
22、epublic 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 United Kingdom. Endorsement notice The text of ISO 7326:2016 has been
23、approved by CEN as EN ISO 7326:2016 without any modification. 3EN ISO 7326:2016 (E) DIN EN ISO 7326:2017-03 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is no
24、rmally 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 liaison with ISO, also take part in
25、 the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular t
26、he different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this docu
27、ment may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.or
28、g/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World
29、Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Rubber and plastics hoses and hose assemblies.This fourth edition
30、 cancels and replaces the third edition (ISO 7326:2006), which has been technically revised with the following changes: in Clause 2, the latest edition of ISO 1431-1 has been cited; 5.5 and 9.4.1 have been amended; in 6.1.1, the formula has been amended.EN ISO 7326:2016 (E) DIN EN ISO 7326:2017-03 4
31、 IntroductionThe methods described in this document provide a means of assessing the resistance of hoses to the deleterious effects of atmospheric ozone under static conditions.5EN ISO 7326:2016 (E) DIN EN ISO 7326:2017-03 1 ScopeThis document specifies five methods for determining the ozone resista
32、nce of the outer covers of hoses: method 1, for bore sizes up to and including 25 mm, carried out on the hose itself; method 2, for bore sizes greater than 25 mm, carried out on a test piece from the hose wall; method 3, for bore sizes greater than 25 mm, carried out on a test piece from the cover;
33、method 4, for all bore sizes, carried out on the hose itself; method 5, for all bore sizes, carried out on hoses that are expandable, for example textile-reinforced hoses.NOTE For hoses with built-in fittings from which it is not possible to take test pieces, the ozone resistance can be assessed on
34、slabs in accordance with ISO 1431-1, using test sheets of the appropriate polymeric compound vulcanized to the same degree.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated re
35、ferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1431-1:2012, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static and dynamic strain testingISO 23529, Rubber General proc
36、edures for preparing and conditioning test pieces for physical test methods3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 8330 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia
37、: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp4 General considerationsMethod 1 and method 2 are the methods normally used, method 3 being used only if it is not possible to carry out the test in accordance with method 2. Method 4 is suitab
38、le for all bore sizes. Method 5 is specifically for testing expandable hoses in the expanded state.The results of tests carried out in accordance with method 1 may not be comparable with the results obtained when tests are carried out in accordance with method 2 or method 3, even if the cover compou
39、nds of the hoses under test are identical in composition and are cured to the same degree. The test method to be used shall be as specified in the product standard.EN ISO 7326:2016 (E) DIN EN ISO 7326:2017-03 6 5 ApparatusAll apparatus placed in the test cabinet shall be fabricated from materials wh
40、ich do not absorb or decompose ozone.5.1 Ozone cabinet, with apparatus for generating ozone, monitoring and controlling the ozone concentration, as described in ISO 1431-1.5.2 Test piece holder, as shown in Figure 1 (for method 1).5.3 Test piece holder, as shown in Figure 2, made, for example, of wo
41、od coated with paint or aluminium (for method 2).5.4 Jig, for elongation of test pieces (for method 3).Details given in ISO 1431-1:2012, 5.6 shall be followed.5.5 Cylinder, as shown in Figure 3, with an outside diameter 2 times that of the specified minimum bend radius for the hose being tested or,
42、if not specified, 8 times the outside diameter (for method 4).5.6 Round rod, as shown in Figure 4, with an outside diameter 1,2 times the inside diameter of the hose being tested (for method 5).6 Test pieces6.1 Type of test piece6.1.1 Method 1The test piece shall consist of a hose sample. The length
43、 shall be calculated by the following formula:Lrdd=+pibextext22whereL is the length of the test piece;rbis the bend radius of the hose under test, as specified in 9.1.1;dextis the outside diameter of the hose under test.6.1.2 Method 2The test piece shall consist of a strip cut longitudinally from th
44、e hose. The strip shall be 150 mm long and 25 mm wide.6.1.3 Method 3The test piece shall consist of a strip of the hose cover, 25 mm in width, removed longitudinally from the hose. Lightly buff the underside of the strip in accordance with ISO 23529 to remove any reinforcement impressions and thus e
45、nsure uniformity of strain along the length of the strip.7EN ISO 7326:2016 (E) DIN EN ISO 7326:2017-03 6.1.4 Method 4The test piece shall consist of a hose sample long enough to be wound at least once round the cylinder which will be used for the test.6.1.5 Method 5The test piece shall consist of a
46、straight length of hose approximately 50 mm long.6.2 Number of test piecesThree test pieces shall be tested.7 Conditioning of test piecesNo test shall be carried out within 24 h of manufacture.The time interval between manufacture and testing shall be as specified in ISO 23529. For evaluations which
47、 are intended to be comparable, the test shall, as far as possible, be carried out after the same time interval after manufacture.The test pieces, mounted as described for the appropriate procedure, shall be conditioned for 48 h in a substantially ozone-free atmosphere at standard temperature (see I
48、SO 23529), in darkness or subdued light.8 Test conditionsUnless other conditions are specified in the relevant hose specification, the test pieces shall be exposed in the ozone cabinet to an ozone concentration of (50 5) pphm (parts per hundred million) by volume at (40 2) C for ()7220h.NOTE 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 hundred million. This effect may be taken into account by expressing the ozone content in the ozonized air in terms
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1