1、BSI Standards PublicationBS ISO 17608:2015Textiles Bare elastaneyarns Determination ofresistance to chlorinated water(swimming-pool water)BS ISO 17608:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 17608:2015.The UK committee draws attention to the fact t
2、hat it voted againstthe adoption of ISO 17608 as a British Standard, as it is not relevantto testing within the UK.The UK participation in its preparation was entrusted to TechnicalCommittee TCI/24, Physical testing of textiles.A list of organizations represented on this committee can beobtained on
3、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 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 77180 4ICS 59.080.30Compliance with a Britis
4、h Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 17608:2015 ISO 2015Textiles Bare elastane
5、 yarns Determination of resistance to chlorinated water (swimming-pool water)Textiles Fils dlasthanne nu Dtermination de la rsistance leau chlore (eau de piscine)INTERNATIONAL STANDARDISO17608First edition2015-09-01Reference numberISO 17608:2015(E)BS ISO 17608:2015ISO 17608:2015(E)ii ISO 2015 All ri
6、ghts reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet o
7、r an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightis
8、o.orgwww.iso.orgBS ISO 17608:2015ISO 17608:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definition 14 Principle 15 Apparatus . 26 Reagents 37 Conditioning and testing atmosphere 48 Preparing test specimens 49 Testing procedure . 410 Results . 611 Test report . 6Bibliography 7 ISO
9、 2015 All rights reserved iiiContents PageBS ISO 17608:2015ISO 17608:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO t
10、echnical 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 the work. ISO collaborates clos
11、ely 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 the different approval criteria n
12、eeded 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 document may be the subject of paten
13、t 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.org/patents).Any trade name used i
14、n 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 WTO principles in the Technical Barrie
15、rs to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 38, Textiles, Subcommittee SC 23, Fibres and yarns.iv ISO 2015 All rights reservedBS ISO 17608:2015INTERNATIONAL STANDARD ISO 17608:2015(E)Textiles Bare elastane yarns D
16、etermination of resistance to chlorinated water (swimming-pool water)1 ScopeThis International Standard specifies a method to determine the resistance of bare elastane yarns to chlorinated aqueous environments, such as swimming pools, through testing of the breaking force retention.Different alterna
17、tive test conditions are specified. Three different concentrations and two different exposure hours are considered.This International Standard is applicable to bare elastane yarns only. Result achieved from yarns cannot be used to predict the fabric performance.2 Normative referencesThe following do
18、cuments, in whole or 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.ISO 139, Textiles Standa
19、rd atmospheres for conditioning and testingISO 3696, Water for analytical laboratory use Specification and test methods3 Terms and definitionFor the purposes of this document, the following terms and definitions apply.3.1elastane yarnfibre composed of at least 85 % by mass of a segmented polyurethan
20、e and which, if stretched to three times its unstretched length, rapidly reverts substantially to the unstretched length when the tension is removed3.2breaking force retentioncapability of a specimen to retain breaking force after a specified treatment whereby the breaking force of the treated speci
21、men is expressed as a percentage of the initial breaking force4 PrincipleBare elastane yarn is subjected to a “chlorinated-water exposure test”. The physical properties are affected by active chlorine in the solution.The breaking force retention is the parameter used to determine the chlorine-resist
22、ant performance. ISO 2015 All rights reserved 1BS ISO 17608:2015ISO 17608:2015(E)5 Apparatus5.1 Suitable mechanical device, consisting of a water bath containing a rotatable shaft which supports, radially, stainless steel containers of a diameter of (75 5) mm and a height of (125 10) mm in (550 50)
23、ml capacity, with covers to be sealed.The bottom of each container is (45 10) mm from the centre of the shaft. The shaft/container assembly is rotated at a frequency of (40 2) r/min.The temperature of the water bath is thermostatically controlled to maintain the prescribed temperature 2 C.Other mech
24、anical devices may be used for the test provided that equivalent results are obtained.5.2 CRE (constant-rate-of-extension) machine, which meets the following requirements.a) The gauge length is set to be (50 0,5) mm and constant rates of extension to be (500 10) mm per min.b) The error of the indica
25、ted or recorded maximum force, at any point in the range in which the machine is used, shall not exceed 1 %.The error of the indicated or recorded jaw separation shall not exceed 0,5 mm.c) The jaws shall be capable of holding the test specimen without allowing it to slip.It is designed so that the j
26、aws do not cut or otherwise weaken the test specimen.d) The machine shall be provided with the means for indicating or recording the force within gauge length.e) The machine is capable of applying a pre-tension as prescribed by the method. 5.3 Winding frame, designed to wind elastane yarn with pre-t
27、ension (see Figure 1).Dimensions in millimetresFigure 1 Winding frame2 ISO 2015 All rights reservedBS ISO 17608:2015ISO 17608:2015(E)Key1 winding frame2 specimenL height of the frame, subjected to height of the containers (5.1), as to avoid shaking while rotated5.4 pH-meter, having an accuracy of 0,
28、02 units.6 Reagents6.1 Deionized water, Grade 3 quality as specified in ISO 3696.6.2 Use only reagents of recognized analytical grade.6.3 Sodium hypochlorite, (NaClO), aqueous solution, having the following composition: Active chlorine: 40 g/l to 160 g/l. Sodium chloride (NaCl): 120 g/l to 170 g/l.
29、Sodium hydroxide (NaOH): 20 g/l maximum. Sodium carbonate (Na2CO3): 20 g/l maximum. Iron (Fe): 0,01 g/l maximum.6.4 Potassium dihydrogenphosphate (KH2PO4).6.5 Disodium hydrogenphosphate dihydrate (Na2HPO42H2O), or disodium hydrogenphosphate dodecahydrate (Na2HPO412H2O).6.6 Sodium hypochlorite, (NaCl
30、O), aqueous solution, containing 100 mg of active chlorine per litre, at pH = 7,50 0,05.Prepare solutions as follows, using deionized water (6.1). Solution 1: dilute 20,0 ml sodium hypochlorite solution (6.3) to 1 l. Solution 2: 14,35 g KH2PO4(6.4) per litre. Solution 3: 20,05 g Na2HPO42H2O (6.5) pe
31、r litre, or 40,35 g Na2HPO412H2O (6.5) per litre.To 25,0 ml of Solution 1, add excess of potassium iodide (KI) and hydrochloric acid (HCl), and titrate the liberated iodine with a sodium thiosulfate solution, c(Na2S2O3) = 0,1 mol/l, using starch solution as indicator.Let the volume of sodium thiosul
32、fate solution required be V ml.For each litre of working solution at pH 7,50 0,05, use:705,0/V ml of Solution 1;100,0 ml of Solution 2;500,0 ml of Solution 3.Dilute to 1 l, with water.Before use, check the pH of the solution with a pH-meter (5.4). ISO 2015 All rights reserved 3BS ISO 17608:2015ISO 1
33、7608:2015(E)If necessary, adjust the pH using either sodium hydroxide, c(NaOH) = 0,1 mol/l, or acetic acid,c(CH3COOH) = 0,1 mol/l.All sodium hypochlorite solutions should be prepared just prior to use.6.7 Sodium hypochlorite, (NaClO), aqueous solution, containing 50 mg of active chlorine per litre,
34、at pH = 7,50 0,05.Follow the same procedure as in 6.6, except that, for each litre of working solution at pH 7,50 0,05, use:705,0/2V ml of Solution 1.All sodium hypochlorite solutions should be prepared just prior to use.6.8 Sodium hypochlorite, (NaClO), aqueous solution, containing 20 mg of active
35、chlorine per litre, at pH = 7,50 0,05.Follow the same procedure as in 6.6, except that, for each litre of working solution at pH 7,50 0,05, use:705,0/5V ml of Solution 1.All sodium hypochlorite solutions should be prepared just prior to use.7 Conditioning and testing atmosphereThe standard atmospher
36、e for conditioning and testing shall comply with ISO 139.8 Preparing test specimens8.1 Prepare 2 samples for each package and number from 1 to 2 in sequence.Specimens from number 1 will be tested breaking force before exposure, while those from number 2 will be tested after exposure.8.2 Discard yarn
37、 on the outer layer of a package (about 1 g) and cut yarn to a length of 1,5 m as the first sample.Discard more yarn, about 3 m to 5 m, before cutting the next sample from the same package.Carefully unwind the yarn using the smallest amount of tension as possible, so as to prevent any over-tensionin
38、g.9 Testing procedure9.1 Fix one end of the yarn on the cross part of the winding frame, to avoid any slipping. Wind sample number 2 (8.1) on the frame (see Figure 1), with the pre-tension related to nominal linear density as recommended in Table 1. Tie another end of the yarn on the frame and ensur
39、e that it does not slip. Try to prevent the parts from touching each other.4 ISO 2015 All rights reservedBS ISO 17608:2015ISO 17608:2015(E)Table 1 Pre-tension options listNominal linear density Pre-tension 25 dtex 0,020 cN 0,000 2 cN 25 dtex to approximately 35 dtex 0,030 cN 0,000 3 cN 35 dtex to ap
40、proximately 50 dtex 0,040 cN 0,000 4 cN 50 dtex to approximately 90 dtex 0,070 cN 0,000 7 cN 90 dtex to approximately 120 dtex 0,105 cN 0,001 0 cN 120 dtex to approximately 160 dtex 0,140 cN 0,001 4 cN 160 dtex to approximately 250 dtex 0,210 cN 0,002 1 cN 250 dtex to approximately 350 dtex 0,300 cN
41、 0,003 0 cN 350 dtex Calculated as (0,001 0 0,000 01) cN/dtex9.2 Treat each sample in a separate container in the mechanical device (5.1). Immerse the frame with the sample into the sodium hypochlorite solution (6.6, 6.7, or 6.8), ensuring that the solution filled the container and the sample is tho
42、roughly wetted. Close and agitate the container at (27 2) C for 24 h or 72 h.9.3 Remove the frame with the sample from the container. Rinse with deionized water (6.1) three times and air-dry at room temperature for at least 15 min.9.4 Cut sample number 1 (8.1) into several smaller parts in length of
43、 10 cm with a minimum of 5 parts from each sample. Hereafter, these smaller parts are referred to as “specimens”.Repeat the same procedure to cut sample number 2, which were “after exposure” (see 9.3), discarding those parts bent around frames.In all, there are a minimum of 5 specimens from the same
44、 sample (8.1).9.5 Condition the specimens in a standard atmosphere (see Clause 7), in a tension-free state for over 2 h.9.6 Choose an appropriate measurement range on the CRE machine (5.2), such that the indicated or recorded maximum breaking force is between 10 % to 90 % of the full range.9.7 Place
45、 one end of the specimen in the middle of the upper-clamp and the other end in the middle of the lower-clamp, at a pre-tension specified in 9.1.Ensure the specimen lies along the axis of CRE machine and tighten the clamps.Set the traversing clamp in motion and extend the specimen to rupture, recordi
46、ng the breaking force.9.8 If the specimen has slipped or broken near the jaw, discard it and replace it with another one.9.9 Repeat procedure 9.7 and test 5 specimens cut from same numbered sample.9.10 Test 5 specimens from number 1.Calculate the mean value of the 5 individual breaking forces. Repor
47、t this mean value as the breaking force “before exposure” (F1).9.11 Test 5 specimens from number 2.Calculate the mean value of the 5 individual breaking forces. Report this mean value as the breaking force “after exposure” (F2). ISO 2015 All rights reserved 5BS ISO 17608:2015ISO 17608:2015(E)10 Resu
48、ltsThe result is expressed as breaking force retention, calculated according to Formula (1). =FF21100% (1)where is the breaking force retention;F1is the breaking force “before exposure”, expressed in cN;F2is the breaking force “after exposure”, expressed in cN.The result is to be rounded to the near
49、est 0,1%.11 Test reportThe test report shall include the following information:a) a reference to this International Standard, i.e. ISO 17608;b) all details necessary for the identification of the sample tested (including method of preparation, if applicable);c) test conditions (concentration of active chlorine, time of exposure and pre-tension);d) test results (breaking force “before exposure”, breaking force “after exposure” and breaking force retention);e)
