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1、BRITISH STANDARD BS EN ISO 10960:1997 Rubber and plastics hoses Assessment of ozone resistance under dynamic conditions The European Standard EN ISO 10960:1996 has the status of a British Standard ICS 23.040.70 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrol
2、led Copy, (c) BSI BS EN ISO 10960:1997 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 11-1998 The following BSI references relate to
3、 the work on this standard: Committee reference PRI/66/4 Draft for comment 92/42982 DC ISBN 0 580 26398 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee PRI/66, Rubber and plastics tubing, hoses and hose assemblies, to S
4、ubcommittee PRI/66/4, Methods of test, upon which the following bodies were represented: British Fluid Power Association British Rubber Manufacturers Association Ltd. Energy Industries Council Ministry of Defence Society of Motor Manufacturers and Traders Limited Amendments issued since publication
5、Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 10960:1997 BSI 11-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope3 2Normative references3 3Principle3 4Apparatus
6、3 5Test pieces3 6Conditioning of test pieces3 7Test conditions3 8Procedure3 9Test report4 Figure 1 Mounted test piece4 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 10960:1997 ii BSI 11-1998 Na
7、tional foreword This British Standard has been prepared by Subcommittee PRI/66/4 and is the English language version of EN ISO 10960:1996 Rubber and plastics hoses Assessment of ozone resistance under dynamic conditions, published by the European Committee for Standardization (CEN). It is identical
8、with ISO 10960:1994 published by the International Organization for Standardization (ISO). EN ISO 10960:1996 has been approved by CEN member bodies under the weighted voting procedures introduced in 1988 to coincide with the introduction of “New Approach” Directives from the Commission of the Europe
9、an Community. Cross-references Publication referred toCorresponding British Standard ISO 471:19841)BS 903 Physical testing of rubber Part A35:1995 Temperatures, humidities and times for conditioning and testing of test pieces ISO 1431-1:1989Part A43:1990 Method for determination of resistance to ozo
10、ne cracking (static strain test) A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary
11、of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment tab
12、le on the inside front cover. 1) This standard has been superseded by ISO 471:1995 with which the British Standard cited is identical. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1
13、0960 August 1996 ICS 23.040.70 Descriptors: Rubber products, plastics products, hoses, rubber hoses, plastics hoses, tests, cracking tests, determination, chemical resistance, ozone, testing conditions English version Rubber and plastics hoses Assessment of ozone resistance under dynamic conditions
14、(ISO 10960:1994) Tuyaux en caoutchouc et en plastique Evaluation de la rsistance lozone dans des conditions dynamiques (ISO 10960:1994) Gummi-und Kunststoffschluche Beurteilung der Ozonbestndigkeit unter dynamischen Bedingungen (ISO 10960:1994) This European Standard was approved by CEN on 1996-02-1
15、5. 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 such national standards may be obtained o
16、n application to the Central Secretariat 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 Central Secretaria
17、t has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for
18、Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO 10960:1996 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy
19、, (c) BSI EN ISO 10960:1996 2 BSI 11-1998 Foreword The text of the International Standard from Technical Committee ISO/TC 45, Rubber and rubber products, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 218, Rubber a
20、nd 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 February 1997, and conflicting national standards shall be withdrawn
21、 at the latest by February 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherl
22、ands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 10960:1996 BSI 11-19983 1 Scope This International Standard specifies a method of assessing the resistance of h
23、oses to the deleterious effects of atmospheric ozone under dynamic conditions. It is applicable to hoses with bore diameters up to and including 25 mm. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International
24、 Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members
25、 of IEC and ISO maintain registers of currently valid International Standards. ISO 471:2), Rubber Times, temperatures and humidities for conditioning and testing. ISO 1431-1:1989, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static strain test. 3 Principle The cover of a
26、hose in a crescent position during reverse bending is exposed to ozone and examined periodically for cracking. 4 Apparatus 4.1 Ozone cabinet, with apparatus for generating ozone and monitoring and controlling the ozone concentration as described in ISO 1431-1. 4.2 Test piece holder, as shown in Figu
27、re 1, with means of carrying out flexing at the required frequency. Details given in ISO 1431-1:1989, subclause 5.6, shall be followed. All apparatus placed in the test cabinet shall be made from materials which do not absorb or decompose ozone. 5 Test pieces 5.1 Type of test piece The test piece sh
28、all consist of a hose sample with a free length L calculated from the formula L = 20 d where d is the outside diameter of the hose under test. 5.2 Number of test pieces Two test pieces shall be tested. 6 Conditioning of test pieces No test shall be carried out within 24 h of manufacture. For evaluat
29、ions which are intended to be comparable, the tests shall, as far as possible, be carried out after the same time interval after manufacture. ISO 471 shall be followed for time between sample manufacture and testing. The test pieces, mounted as described in 8.1, shall be conditioned for 48 h in a su
30、bstantially ozone-free atmosphere at standard temperature (see ISO 471), in darkness or subdued light. 7 Test conditions Unless 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) parts per hundr
31、ed million (pphm) by volume at 40 C 2 C for (72 ) h. NOTE 1It 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
32、 the ozone content in the ozonized air in terms of partial pressure, i.e. in millipascals, and making comparisons at constant ozone partial pressure. At standard conditions of atmospheric pressure and temperature (101 kPa, 273 K), a concentration of 1 pphm is equivalent to a partial pressure of 1,01
33、 mPa. 8 Procedure 8.1 Mount the test piece as shown in Figure 1 and place it in the ozone cabinet. 8.2 Carry out flexing at a frequency of 0,3 Hz 0,03 Hz and in the test conditions as described in clause 7. The maximum travel of the piston shall be such that the distance from the lower edge of the p
34、iston to the ends of the hose is five times the outside diameter of the hose 2 mm (distance B in Figure 1). During the return stroke, the piston shall return to a position where the hose is completely unloaded. 8.3 Test pieces may be examined after periods of exposure of 2 h, 4 h, 24 h, 48 h and 72
35、h, whilst still mounted in the test apparatus, under 2 magnification, ignoring the area adjacent to the fixing point. If cracks are discovered, record their nature and the time at which they were first observed. 2) To be published. (Revision of ISO 471:1983 and ISO 1826:1981). 0 2 Licensed Copy: she
36、ffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 10960:1996 4 BSI 11-1998 9 Test report The test report shall include the following information: a) a reference to this International Standard; b) all details necessary for the identification of the hose t
37、ested; c) details of the test conditions, i.e. ozone concentration, temperature and exposure period; d) whether cracks were observed and, if so, their nature and the time the cracks were observed; e) the date of the test. Figure 1 Mounted test piece Licensed Copy: sheffieldun sheffieldun, na, Sat No
38、v 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 10960:1997 BSI 11-1998 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 15:57:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | |
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