ISO INTERNATIONAL STANDARD 21083-1 First edition 2018-11 Test method to measure the efficiency of air filtration media against spherical nanomaterials Part 1: Size range from 20 nm to 500 nm Methode d'essai pour mesurer I'efficacite des medias de filtration d'air par rapport aux nanomateriaux sphériques Partie 1: Spectre granulométrique de 20 nm a 500 nm Reference number IS0 21083-1:2018(E) ISO @ IS0 2018 IS0 21083-1:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 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: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 21083-1:2018(E) Contents Page Foreword ..V Introduction.. ...vi 1 Scope. 2 Normative references 3 Terms, definitions, symbols and abbreviated terms. 3.1 Terms and definitions. 3.2 Symbols and abbreviated terms. 4 Principle ..3 5 Test materials ..4 5.1 General ..4 5.2 Liquid phase aerosol. 5.2.1 DEHS test aerosol .4 5.2.2 Liquid phase aerosol generation 6 Test setup ..6 6.1 General .6 6.2 Specification of setup ..8 6.2.1 Aerosol generation system. ..8 6.2.2 Tubing ..8 6.2.3 Dryer. ..8 6.2.4 DEMC. .9 6.2.5 Equilibrium charge distribution and neutralization of aerosol particles .11 6.2.6 Neutralization of aerosol particles. ..11 6.2.7 Make-up air line.. 6.2.8 Test filter medium mounting assembly ..13 6.2.9 CPC ..14 6.2.10 Final filter .16 6.3 Detailed setup for test using DEHS particles .16 6.4 Determination ofthe filter medium velocity ..17 7 Qualification of the test rig and apparatus. .17 7.1 CPCtests ..17 7.1.1 CPCAir flow rate stability test ..17 7.1.2 CPC - Zero test. .18 7.1.3 CPC-Overload test .18 7.1.4 Counting accuracy calibration. .18 7.2 DEMCtests 21 7.3 Qualification of aerosol neutralization. .21 7.3.1 General 21 7.3.2 Qualification of neutralization by checking the multiple charge fraction on the particles passing through the neutralizer. .21 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 22 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 .23 8.1 Determination of the correlation ratio/zero efficiency test .23 8.2 Protocol of filtration efficiency measurement. .24 IS0 2018 - All rights reserved iii