SANS 23711-2008 Elastomeric seals - Requirements for materials for pipe joint seals used in water and drainage applications - Thermoplastic elastomers《弹性体密封件 排水管道接口密封件材料要求 热塑性弹性体》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21751-8 SANS 23711:2008Edition 1ISO 23711:2003Edition 1SOUTH AFRICAN NATIONAL STANDARD Elastomeric seals Requirements for materials for pi

4、pe joint seals used in water and drainage applications Thermoplastic elastomers This national standard is the identical implementation of ISO 23711:2003 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Gr

5、oenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 23711:2008 Edition 1 ISO 23711:2003 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 45, Rubber and rubbe

6、r products, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in September 2008. Reference numberISO 23711:2003(E)ISO 2003INTERNATIONAL STANDARD ISO23711First edition2003-12-01Elastomeric seals Requirem

7、ents for materials for pipe joint seals used in water and drainage applications Thermoplastic elastomers Garnitures dtanchit en caoutchouc Spcification des matriaux pour garnitures dtanchit utilises dans le domaine de leau et du drainage lastomres thermoplastiques SANS 23711:2008This s tandard may o

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11、roblem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and micr

12、ofilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2

13、003 All rights reservedSANS 23711:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 23711:2003(E) ISO 2003 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 2 4 Classification

14、. 2 5 Finished-seal requirements . 2 6 Test pieces and temperature . 5 7 Quality assurance . 7 8 Storage. 7 9 Designation 7 10 Marking and labelling . 8 Annex A (informative) Quality assurance 9 Annex B (informative) Guidance on storage of seals . 10 Bibliography . 11 SANS 23711:2008This s tandard m

15、ay only be used and printed by approved subscription and freemailing clients of the SABS .ISO 23711:2003(E) iv ISO 2003 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepari

16、ng International Standards is normally 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 lia

17、ison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of

18、technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is

19、drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 23711 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 4, Products (

20、other than hoses). SANS 23711:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 23711:2003(E) ISO 2003 All rights reserved 1Elastomeric seals Requirements for materials for pipe joint seals used in water and drain

21、age applications Thermoplastic elastomers 1 Scope This International Standard specifies requirements for materials used for moulded seals made of thermoplastic elastomers (TPEs) for joints in: a) thermoplastic piping systems for non-pressure waste water discharge (intermittent flow at up to 95 C) in

22、side buildings; b) thermoplastic piping systems for non-pressure underground drainage and sewerage (continuous flow at up to 45 C and intermittent flow at up to 95 C); c) thermoplastic rainwater piping systems. General requirements for finished joint seals are also given; any additional requirements

23、 called for by the particular application are specified in the relevant product standards taking into account that the performance of pipe joints is a function of the seal material properties, seal geometry and pipe joint design. 2 Normative references The following referenced documents are indispen

24、sable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 37, Rubber, vulcanized or thermoplastic Determination of tensile stress-strain properties IS

25、O 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests ISO 471, Rubber Temperatures, humidities and times for conditioning and testing ISO 815, Rubber, vulca

26、nized or thermoplastic Determination of compression set at ambient, elevated or low temperatures ISO 1431-1, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static strain test ISO 1817, Rubber, vulcanized Determination of the effect of liquids ISO 3302-1, Rubber Tolerances f

27、or products Part 1: Dimensional tolerances ISO 3384:1999, Rubber, vulcanized or thermoplastic Determination of stress relaxation in compression at ambient and at elevated temperatures SANS 23711:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the S

28、ABS .ISO 23711:2003(E) 2 ISO 2003 All rights reservedISO 4661-1, Rubber, vulcanized or thermoplastic Preparation of samples and test pieces Part 1: Physical tests ISO 9691:1992, Rubber Recommendations for the workmanship of pipe joint rings Description and classification of imperfections 3 Terms and

29、 definitions For the purposes of this document, the following terms and definitions apply. 3.1 thermoplastic elastomer a polymer or blend of polymers that does not require vulcanization or cross-linking during processing, yet has elastic properties at its service temperature NOTE These properties di

30、sappear at processing temperature, so that further processing is possible, but return when the material is returned to its service temperature. 4 Classification A nominal hardness of materials shall be specified within the ranges in Table 1. Table 1 Hardness classification Hardness class 50 60 70 Ra

31、nge of hardness, IRHD 46 to 55 56 to 65 66 to 75 The three classes of hardness for materials for pipe joint seals are specified in Table 2. 5 Finished-seal requirements 5.1 Dimensional tolerances Tolerances shall be specified from the appropriate classes in ISO 3302-1. 5.2 Imperfections and defects

32、The seals shall be free of defects or irregularities, which could affect their function. Classification of imperfections shall be according to ISO 9691 as follows: surface imperfections in zones involved in the sealing function as described in 4.1.1 of ISO 9691:1992 shall be considered as defects. s

33、urface imperfections in zones not involved in the sealing function as described in 4.1.2.1 b) of ISO 9691:1992 shall not be considered as defects. NOTE 1 Major surface imperfections in zones not involved in the sealing function as described in 4.1.2.1 a) of ISO 9691:1992 could be considered as defec

34、ts. This should be agreed between the interested parties; the acceptance criteria depend upon the seal type or design. NOTE 2 Internal imperfections as described in 4.2 of ISO 9691:1992 could be considered as defects. The compressive force can be determined in accordance with ISO 7743. The acceptabl

35、e limiting values of the compressive force should be agreed between the interested parties; they depend upon the seal type or design. SANS 23711:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 23711:2003(E) ISO 2003 All rights reserve

36、d 35.3 Hardness When determined by the microtest method specified in ISO 48, on samples prepared in accordance with 6.1.2, the hardness shall comply with the requirements given in Table 2. NOTE If the dimensions of a seal are appropriate, the normal test method specified in ISO 48 can be used, provi

37、ded that the microtest method is used for reference purposes. For the same seal, the difference between the minimum and maximum hardness values shall not be more than 5 IRHD. Each value shall be within the specified tolerances. 5.4 Tensile strength and elongation at break The tensile strength and el

38、ongation at break shall be determined by the method specified in ISO 37 in the direction perpendicular to the mould flow on dumb-bell test pieces, preferably cut out of a seal or out of a sample plate. The results obtained on sample plate test pieces shall be accepted. Sample plates shall be prepare

39、d as specified in 6.1.1 and 6.1.3. The tensile strength and elongation at break shall comply with the requirements given in Table 2. 5.5 Compressive set in air 5.5.1 General If the test piece is taken from a seal, then the measurement shall be carried out as far as possible in the direction of compr

40、ession of the seal in service at 25 % compression. 5.5.2 Compression set at 23 C and 70 C When determined by the method specified in ISO 815, at 23 C and 70 C, using the small type B test piece, the compression set shall comply with the requirements given in Table 2. 5.5.3 Low temperature compressio

41、n set at 10 C When determined by the method specified in ISO 815 at 10 C, using the small type B test piece, and the (30 3) min recovery measurement, the compression set of seals used in drainage and sewerage applications shall comply with the requirements given in Table 2. 5.6 Accelerated ageing in

42、 air Test pieces prepared for the determination of hardness according to 5.3 and for the determination of tensile strength and elongation at break (see 5.4) shall be aged in air by the normal oven method specified in ISO 188, for 7 days at 70 C. The changes in hardness, tensile strength and elongati

43、on at break shall comply with the requirements given in Table 2. 5.7 Stress relaxation in compression The stress relaxation shall be determined at 23 C by method A of ISO 3384:1999 using the small cylindrical test piece after applying mechanical and thermal conditioning. Measurements shall be taken

44、after 3 h, 1 day, 3 days and 7 days for the 7-day test and after 3 h, 1 day, 3 days, 7 days, 30 days and 100 days for the 100-day test. The best-fit straight line shall be determined by regression analysis using a logarithmic time scale and the correlation coefficients derived from these analyses sh

45、all not be lower than 0,93 for the 7-day test and 0,83 for the 100-day test. The 7-day and 100-day requirements in Table 2 are those derived from these straight lines. SANS 23711:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 23711:2

46、003(E) 4 ISO 2003 All rights reservedFor continuous measurement using an apparatus described in the first paragraph of 5.2 in ISO 3384:1999, the 7-day and 100-day requirements in Table 2 are those derived from the measurements at 7 days and 100 days. The stress relaxation in compression shall comply

47、 with the requirements given in Table 2 at the following temperatures and times: 7 days at (23 2) C; 100 days at (23 2) C. The test temperature shall be maintained within the specified tolerance during the whole period of the test and verified by suitable recording equipment on a continuous basis. T

48、he 100-day test shall be considered as a type approval test. If the test piece is taken from a seal, then the measurement shall be carried out as far as possible in the direction of compression of the seal in service. 5.8 Volume change in water When determined by the method specified in ISO 1817, af

49、ter 7 days immersion of test pieces in distilled or deionized water at a temperature of 70 C, the change in volume shall comply with the requirements given in Table 2. 5.9 Ozone resistance When determined by the method specified in ISO 1431-1 under the conditions set out below: Ozone concentration (50 5) pphm; Temperature (40 2) C; Pretension time (72 + 0/-2) h; Exposure time (48 + 0/-2) h; Elongation (20 2) %; Relative humidity (55 10) %. Th