© ISO 2016 Pneumatic tubes for automotive vehicles — Technical requirements and test methods Chambres à air pour véhicules automobiles — Exigences techniques et méthodes d’essai INTERNATIONAL STANDARD[.]
INTERNATIONAL STANDARD ISO 17464 First edition 2016-02-01 Pneumatic tubes for automotive vehicles — Technical requirements and test methods Chambres air pour véhicules automobiles — Exigences techniques et méthodes d’essai Reference number ISO 17464:2016(E) © ISO 2016 ISO 17464:2016(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2016, Published in Switzerland All rights reserved Unless otherwise specified, no part o f 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 or an intranet, without prior written permission Permission can be requested from either ISO at the address below or ISO’s member body in the country o f the requester ISO copyright o ffice Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2016 – All rights reserved ISO 17464:2016(E) Contents Page Foreword iv Scope Normative references Terms and definitions Materials, form and fit Test requirements Air tightness Marking Sampling Annex A (normative) Preparation of dumbbell test specimen from tube Annex B (normative) Test conditions and test procedure for set after ageing Annex C (normative) Accelerated ageing test Annex D (informative) Identification scheme for month and year o f manufacturing (one example for the scheme o f marking month and year on tube) © ISO 2016 – All rights reserved iii ISO 17464:2016(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f preparing 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 liaison with ISO, also take part in the work ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso.org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f 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 in this document is in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the meaning o f ISO specific terms and expressions related to formity assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary in formation The committee responsible for this document is ISO/TC 31, Tyres, rims and valves iv © ISO 2016 – All rights reserved INTERNATIONAL STANDARD ISO 17464:2016(E) Pneumatic tubes for automotive vehicles — Technical requirements and test methods Scope This International Standard specifies the technical requirements and test methods for tubes o f pneumatic tyres for automotive vehicles Normative references The following documents, in whole or in part, are normatively re ferenced in this document and are indispensable for its application For dated re ferences, only the edition cited applies For undated re ferences, the latest edition o f the re ferenced document (including any amendments) applies ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests ISO 3877-3, Tyres, valves and tubes — List of equivalent terms — Part 3: Tubes ISO 9413, Tyre valves — Dimensions and designation Terms and definitions For the purposes o f this document, the terms and definitions given in ISO 3877-3 apply Materials, form and fit The tubes shall be manufactured from an appropriate rubber compound and vulcanized to an endless annular ring shape and shall be with a valve or spud conforming to ISO 9413 4.1 4.2 The tubes shall be classified into the following two classes: a) class A – natural rubber and its derivatives and blends; b) class B – butyl rubber/halobutyl rubber and its derivative and blends 4.2.1 A blend shall be named after prime rubber whose percentage by volume is more than 60 % in the compound 4.3 The tube shall be uni form in thickness, free from flaws and designed to fit in a tyre o f the corresponding nominal size 4.3.1 Thickness uni formity Except for the region at or near lap or splice, the thickness of the tube when measured along the longitudinal direction o f the tube shall not vary from the arithmetic mean o f the readings by ±17,5 % at any point © ISO 2016 – All rights reserved ISO 17464:2016(E) 4.3.2 The arithmetic mean of the tube thickness shall be determined for the points which lie in the same circumferential line or the length of the tube (see Figure 1) The thickness variation shall be determined for circumferential line at the crown centre 1 crown crown (±17,5 % from average o f four checks) equally spaced around the circumference base valve K e y F i g u r e — M e a s u r e m e n t o f t u b e t h i c k n e s s u n i f o r m i t y Test requirements 5.1 5.1.1 Each type o f tube shall form to the following requirements Elongation Dumbbell test pieces punched out in circumferential direction of the tube when tested in accordance ISO 37 and Annex A shall have elongation at break not less than 500 % for “class A” tubes and not less than 450 % for “class B” tubes 5.1.2 Strength of splice Tensile strength of splice determined on dumbbell in accordance with ISO 37 and Annex A shall not be less than 85 kg f/cm for “class A” tubes and 35 kg f/cm for “class B” tubes 5.1.3 Set after ageing Dumbbell test pieces punched out in circum ferential direction o f the tube when subjected to test conditions and test procedure in accordance with Annex B shall have set after ageing not more than 25 % for “class A” tubes and not more than 35 % for “class B” tubes 5.1.4 Accelerated ageing Dumbbell test pieces punched out in circum ferential direction o f the tube body when subjected to accelerated ageing test at (100 ± 2) °C for 48 h and tested in accordance with ISO 37, ISO 188 and Annex C shall not have a percentage drop in elongation at break more than 35 % from original, for both “class A” and “class B” tubes Air tightness Each type o f tube with valves attached shall be inflated to just round out and tested in water for the evidence o f any leakage Alternatively, vacuum leak or pressure-less detection method may be used as per the manu facturers’ practice in lieu o f the water test method The tube shall not show any leakage © ISO 2016 – All rights reserved ISO 17464:2016(E) Marking 7.1 Tub es s hall b e p ermanently and legib ly marked o n the o uts ide with the fo llo wing a) The manufacturer’s name or trade name b) T he tyre s i z e de s ignation or de s ignation s description shall contain the following: 1) for wh ich the tub e i s appl ic able T he s i z e de s ignation the nom i na l tyre s e c tion width co de; 2) the nominal rim diameter code; 3) the nominal aspect ratio, if applicable; 4) “R” to identi fy rad i a l tyre appl ic ation; 5) the cha rac ter “– ” or the le tter “D ” to identi fy bia s tyre appl ic ation c) T he manu fac tu ri ng month and ye ar s l l b e i nd ic ate d cle a rly with the appropri ate me tho d , and d) T he word “B U T YL” a nd/or blue l i ne o f , m m m i n i mu m width to identi fy tub e o f cla s s B s tandard one scheme example is given in Annex D Sampling The scale of sampling and the criteria of acceptance shall be as agreed to between the manufacturer and the purchaser © ISO 2016 – All rights reserved ISO 17464:2016(E) Annex A (normative) Preparation of dumbbell test specimen from tube A.1 Preparation of test pieces A.1.1 a tub e, Test pieces shall be in dumbbell shape and shall be taken in the circumferential direction of f f f Figure A.1 fro m p o rtio n excep t the s p lice j o int dumb b ell s hall b e p unched o ut A.1.2 j o int s p lice, The number of test pieces shall be four each from a tube Size of test pieces shall be mm (or mm) dumb b ell tes t p ieces , A.1.3 o r the elo ngatio n tes t Fo r tes ting s trength o ro m the s p lice j o int at the centre as s hown in fo r meas urement o f tens ile s trength o f s p lice and elo ngatio n o f b o dy The mean value of both ends of parallel parts shall be used as the thickness of test pieces for calculating the tens ile s trength o f s p lice j o ints A.1.4 used Fo r elo ngatio n and tens ile s trength o f j o ints , meas ured median value o f fo ur tes t p ieces s hall b e Key f f for elongation at break test s p lice j o int o r tens ile s trength tes t o s p lice j o int Figure A.1 — Method of taking test pieces © ISO 2016 – All rights reserved ISO 17464:2016(E) Annex B (normative) Test conditions and test procedure for set after ageing B.1 Test conditions for ageing : Air oven Typ e o f oven Temperature Time to be kept in oven Dimensions of test piece Stretch of test piece during ageing : 10 ° C to 10 ° C : h : m m wide m m lo ng me a s u re d on m m du mb b el l : 50 % B.2 Determination of the set The test piece shall be removed from the oven and allowed to cool under tension for h The tension shall be released and the percentage set measured after a rest of not less than h or more than 24 h The tension set (set after ageing) shall be expressed as the extension remaining after a specimen has percentage of the original length Formula (B.1) is used to calculate the percentage tension set Tension set = 100 × ( − ) (B.1) b e en s tre tche d a nd a l lowe d to re trac t i n a s p e c i fie d man ner and the s ame s l l b e e xpre s s e d a s a l l /l where l l i s the re ference leng th a fter re cover y; is the unstrained reference length © ISO 2016 – All rights reserved ISO 17464:2016(E) Annex C (normative) Accelerated ageing test C.1 Preparing the test pieces P rep are fou r (10 ± ) ° C te s t pie ce s for as s p e ci fie d in Annex B and s ubj e c t them to the accelerate d agei ng for 48 h C.2 Measuring the elongation at break Measure the elongation at break in accordance with ISO 37 and then calculate the percentage drop in elongation at break compared with respective un-aged elongation at break using Formula (C.1): PDEB = 00 × ( L − L ) / L (C.1) o where PDEB Lo La a o is the percentage drop in elongation at break after ageing; is the median value of elongation at break percentage before ageing test; is the median value of elongation at break percentage after ageing test © ISO 2016 – All rights reserved ISO 17464:2016(E) Annex D (informative) I d e e D n t i x a I d e f i m n c a p t i l f i t i e c n f a o o t i o s r n c h t h s c e e h e m s c m e h f o e r m e m o o f n t h m a r a n k i d n y e g a m r o o n f t h m a a n n d u f a y e c a t u r o r i n n g t u ( b o e n e ) e D.1.1 Manu facturing month and year are engraved as per scheme depicted in Figure D.1 as per D.1.6 or printed D.1.2 Month code circle and year are to be engraved on the tube body D.1.3 Each month should be identified by a punch marking o f at least 0,5 mm diameter in the respective quarter D.1.4 After completing year, fresh identification shall be started again for the next year with next circle After completing all three circles, re-engraving can be done after masking the previous engraving/punch marking D.1.5 D.1.6 Alternative method which indicates the week and year or month and year o f manufacturing is also acceptable Dimensions in millimetres F EXAMPLE i g u r e D — S c h e m e o f m a r k i n g m o n t h a n d y e a r o n t u b e Identification for April 2016 is depicted in Figure D.1 However, dots can be in any quadrant Max dots in a quadrant are three © ISO 2016 – All rights reserved ISO 7464: 01 6(E) ICS 83.160.01 Price based on pages © ISO 2016 – All rights reserved