ISO INTERNATIONAL STANDARD 9177-3 Second edition 2022-01 Mechanical pencils for technical drawings - Part 3: Black leads Bending strengths of HB leads Porte-mines pour le dessin technique Partie 3: Mines graphite - Résistance a la flexion des mines HB Reference number ISO 9177-3:2022(E) so Copyright International Organization for Standardization ISO2022 IS0 9177-3:2022(E) COPYRIGHT PROTECTED DOCUMENT @IS02022 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 Email: copyright@iso.org Website: www.iso.org Published in Switzerland Copyigh ilhleratinal Oorganizationfor Standardization @ IS0 2022 - All rights reserved