© ISO 2017 Leather — Physical and mechanical tests — Determination of apparent density and mass per unit area Cuir — Essais physiques et mécaniques — Détermination de la masse volumique apparente et d[.]
INTERNATIONAL STANDARD ISO 2420 IULTCS/IUP Third edition 2017-02 Leather — Physical and mechanical tests — Determination of apparent density and mass per unit area Cuir — Essais physiques et mécaniques — Détermination de la masse volumique apparente et de la masse surfacique Reference numbers ISO 2420:2017(E) IULTCS/IUP 5:2017(E) © ISO 2017 ISO 2420:2017(E) IULTCS/IUP 5:2017(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2017, 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 2017 – All rights reserved ISO 2420:2017(E) IULTCS/IUP 5:2017(E) Contents Page Foreword iv Scope Normative references Terms and definitions Principle Apparatus Sampling and sample preparation Procedure Expression of results 7.1 7.2 7.3 7.4 Test conditions Measurement of thickness Measurement of dimensions Measurement of mass 8.1 Apparent density 8.2 Mass per unit area Test report © ISO 2017 – All rights reserved iii ISO 2420:2017(E) IULTCS/IUP 5:2017(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 World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html ISO 2420 was prepared by the Physical Test Commission o f the International Union o f Leather Technologists and Chemists Societies (IUP Commission, IULTCS) in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, the secretariat of which is held by UNI, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement) It is based on IUP originally published in J Soc Leather Trades Chemists, 42 , p 388, (1958), and declared an o fficial method o f the IULTCS in 1959 An updated version was published in J Soc Leather Tech Chem , 82 , p 227, (1998) and a further revision was published in J Soc Leather Tech Chem 84 p 313, (2000) and reconfirmed as an o fficial method in March 2001 IULTCS, originally formed in 1897, is a world-wide organization o f pro fessional leather societies to urther the advancement o f leather science and technology IULTCS has three Commissions, which f are responsible for establishing international methods for the sampling and testing of leather ISO recognizes IULTCS as an international standardizing body for the preparation o f test methods for leather This third edition cancels and replaces the second edition (ISO 2420:2002), which has been technically revised with the following changes: — the mass per unit area has been included; — the option to use square test pieces has been included iv © ISO 2017 – All rights reserved ISO 2420:2017(E) IULTCS/IUP 5:2017(E) INTERNATIONAL STANDARD Leather — Physical and mechanical tests — Determination of apparent density and mass per unit area Scope T h i s c u ment s p e ci fie s a me tho d for leather It is applicable to all leathers de term i ni ng the app arent den s ity and the ma s s p er un it a re a o f Normative references T he fol lowi ng c u ments are re ferre d to i n the tex t i n s uch a way th at s ome or a l l o f thei r content s titute s re qu i rements o f th i s c u ment For date d re ference s , on ly the e d ition cite d app l ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c ument (i nclud i ng a ny amend ments) appl ie s ISO 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location ISO 2419, Leather — Physical and mechanical tests — Sample preparation and conditioning ISO 2589, Leather — Physical and mechanical tests — Determination of thickness EN 15987, Leather — Terminology — Key definitions for the leather trade Terms and definitions For the pu r p o s e s o f th i s c u ment, the term s and defi nition s given i n E N 59 apply ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia org/ — ISO Online browsing platform: available at http://www.iso org/obp Principle The volume of a test piece is calculated from the area and thickness, treating the test piece as a rightangle d c i rc u la r c yl i nder or c ub oid with a s quare b as e T he app arent den s ity i s ob tai ne d b y d ivid i ng the mas s by the volu me T he mas s p er u n it are a i s ob ta i ne d b y d ivid i ng the ma s s b y the are a Apparatus 5.1 Press knife , co n fo rming to I S O 41 , the inner wall o f which is a circle, ap p roximately mm in diameter, o r s quare, ap p roximately (1 0 × 0 ) mm 5.2 Thickness gauge , as s p ecified in I S O 5.3 Balance , reading to 0,001 g 5.4 Vernier callipers , reading to 0,01 mm © ISO 2017 – All rights reserved ISO 2420:2017(E) IULTCS/IUP 5:2017(E) Sampling and sample preparation S ample i n accorda nce with I S O 41 From the s ample, c ut th re e te s t pie ce s b y applyi ng the pre s s kn i fe (5.1) to the grain surface and condition them in accordance with ISO 2419 I f there is a requirement for more than two hides or skins to be tes ted in one b atch, then only one tes t piece needs to be taken from each hide or skin, provided that the overall total is not less than three test pieces Procedure 7.1 Test conditions C arr y out a l l op eration s i n a s ta nda rd atmo s phere as s p e ci fie d i n I S O 419 7.2 Measurement of thickness Measure the thickness of each test piece in accordance with ISO 2589 Measure the thickness, in millimetres, at three points forming the corners of an equilateral triangle, with each situated f f f piece Take the arithmetic mean of the four results as the thickness of the test piece, t approxi mately m m NO TE rom the centre o the te s t pie ce Me a s u re the th ickne s s at the centre o T he centre o f the te s t p ie ce a nd the o ther p oi nts fo r the te s t me a s u rement a re e s ti m ate d b y e ye 7.3 Measurement of dimensions For circular test pieces, measure the diameter using Vernier callipers (5.4) to the nearest 0,05 mm in two directions at right angles to each other on the grain surface and two directions at right angles on f f f f d f f ff than 0,5 mm For square test pieces, measure the distances AC and BD, where A, B, C and D are the midpoints of each side to within 0,5 mm, using Vernier callipers (5.4) to the nearest 0,05 mm as shown in Figure f f f the results for the two results of AC, a, and BD, b f ff f surface the fle s h s u r ace Ta ke the arith me tic me an o the ou r re s u lts as the me an d ia me ter o the te s t pie ce, Rej e c t any te s t pie ce where the d ia me ters on either the grai n s u r ace or the fle s h s ur ace d i er b y more Me as u re the d i s tance s on b o th the grai n s u r ace a nd on the fle s h s u r ace Ta ke the arith me tic me a n o , re s p e c tively Rej e c t any te s t pie ce where the d i s tance me a s ure d on the grai n s ur ace d i ers more th an , m m rom the d i s tance me a s u re d on the fle sh Figure — Measurement of distances on square test pieces © ISO 2017 – All rights reserved ISO 2420:2017(E) IULTCS/IUP 5:2017(E) 7.4 Measurement of mass Measure the mass of the test piece, m , in grams to the nearest 0,001 g Expression of results 8.1 Apparent density For c yl i nd ric a l te s t pie ce s , the app arent den s ity, using Formula (1): Da = Da , in kilograms per cubic metre shall be calculated , 273 × 10 × m (1) t ×d2 where is the mean thickness of the test piece in millimetres (as obtained in 7.2); is the mean diameter of the test piece in millimetres (as obtained in 7.3); is the mass of the test piece in grams (as obtained in 7.4) t d m NOTE Formula (1) a s s u me s th at the s a mp le i s a c i rc u l a r c yl i nder who s e volu me , , in cubic millimetres is V given b y: V= T he π × d2 × t fac tor wh ich i s s i mp l i fie d to d2 ×t , 273 , conti nue s th rough to the fi na l c a lc u lation For c ub oid te s t pie ce s with a s quare b as e , the app arent den s ity, be calculated using Formula (2): Da = Da , in kilograms per cubic metre shall 10 × m (2) t×a×b where t a b m NO TE is the mean thickness of the test piece in millimetres (as obtained in 7.2); is the mean distance AC of the test piece in millimetres (as obtained in 7.3); is the mean distance BD of the test piece in millimetres (as obtained in 7.3); is the mass of the test piece in grams (as obtained in 7.4) T he app a rent den s ity o f le ather i s o ften e x pre s s e d i n g/c m units, then g/cm3 = 000 kg/m3 © ISO 2017 – All rights reserved I f it i s ne ce s s a r y to e xp re s s it i n the s e ISO 2420:2017(E) IULTCS/IUP 5:2017(E) 8.2 Mass per unit area For c yl i nd ric a l te s t pie ce s , the ma s s p er u n it a re a, using Formula (3): ma , in grams per square metre shall be calculated ×m m a = , 273 × 10 d (3) where is the mean diameter of the test piece in millimetres (as obtained in 7.3); m is the mass of the test piece in grams (as obtained in 7.4) For cuboid test pieces with a square base, the mass per unit area, m a, in grams per square metre shall be calculated using Formula (4): d m a = 10 × m a×b (4) where a b m is the mean distance AC of the test piece in millimetres (as obtained in 7.3); is the mean distance BD of the test piece in millimetres (as obtained in 7.3); is the mass of the test piece in grams (as obtained in 7.4) Test report The test report shall include at least the following: a) a reference to this document, i.e ISO 2420:2017; b) the me an app a rent den s ity, Da , i n ki lo gram s p er c ubic me tre expre s s e d to th re e s ign i fic ant figu re s; c) the mean mass per unit area, m a d) the standard atmosphere used for conditioning and testing as given in ISO 2419; , i n gram s p er s qua re me tre expre s s e d to th re e s ign i fica nt figu re s; e) f) any deviation s fu l l de tai l s sampling for from the me tho d s p e c i fie d i n th i s c u ment; identi fic ation o f the s ample and any devi ation s from ISO 41 with re s p e c t to © ISO 2017 – All rights reserved ISO 2420:2017(E) IULTCS/IUP 5:2017(E) ICS 59.140.30 Price based on pages © ISO 2017 – All rights reserved