ISO/TS TECHNICAL SPECIFICATION 21083-2 First edition 2019-03 Test method to measure the efficiency of air filtration media against spherical nanomaterials Part 2: Size range from 3 nm to 30 nm Methode d'essai pour mesurer I'efficacite des medias de filtration d'air par rapport aux nanomatériaux sphériques - Partie 2: Spectre granulométrique de 3 nm a 30 nm Reference number ISO/TS 21083-2:2019(E) osi @ IS0 2019 IS0/TS 21083-2:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 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 of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0/TS 21083-2:2019(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. ..1 2 Normative references 3 Terms, definitions, symbols and abbreviated terms. ..1 3.1 Terms and definitions. .1 3.2 Symbols and abbreviated terms 3.2.1 Symbols .2 3.2.2 Abbreviated terms. 3 4 Principle. 5 Test materials 5.1 General .4 5.2 Solid phase aerosol Silver test aerosol as an example .4 5.3 Solid phase aerosol generation method. .4 6 Test setup ..5 6.1 General .5 6.2 Specifications of setup 7 Aerosol generation system. .7 6.2.1 6.2.2 Tubing .7 6.2.3 DEMC .7 6.2.4 Equilibrium charge distribution and neutralization of aerosol particles .9 6.2.5 Neutralization of aerosol particles .10 6.2.6 Make-up air line. ..12 6.2.7 Test filter mounting assembly ..12 6.2.8 CPC ..13 6.2.9 Final filter .15 6.3 Detailed setup for test using silver nanoparticles .. 15 6.4 Determination of the filter medium velocity ..16 1 Qualification of the test rig and apparatus. .16 7.1 CPCtests ..16 7.1.1 CPC - Air flow rate stability test ..16 7.1.2 CPC - Zero test. ..17 7.1.3 CPC - Overload test .17 7.1.4 Counting accuracy calibration. 18 7.2 DEMCtests 20 7.3 Qualification of aerosol neutralization. 20 7.3.1 General 20 7.3.2 Qualification of neutralization by checking the multiple charge fraction on the particles passing through the neutralizer 20 7.3.3 Qualification of the aerosol neutralizer using corona discharge balanced output .21 7.3.4 Qualification of neutralization according to ISO/TS 19713-1 21 7.4 System leak checks. .22 7.4.1 Air leakage tests 22 7.4.2 Visual detection by cold smoke 22 7.4.3 Pressurization of the test system 22 7.4.4 Use of high efficiency filter media. 22 7.5 Uniformity of the test aerosol concentration 22 8 Test procedure. .22 8.1 Determination of the correlation ratio. 22 8.2 Protocol of filtration efficiency measurement 24 @ IS0 2019 - All rights reserved ii