ISO INTERNATIONAL STANDARD 6425 Fourth edition 2018-10 Horology Divers' watches Horlogerie - Montres de plongée Reference number IS0 6425:2018(E) ISO @IS02018 IS0 6425:2018(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: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 6425:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references 3 Terms and definitions ..1 4 Test methods and requirements 2 4.1 General .2 4.1.1 Temperature .2 4.1.2 Visual checking. 2 4.1.3 Tested product configuration 2 4.1.4 Practical meaning 2 4.1.5 Diving time indicator 2 4.1.6 Type testing and 100 % single watch testing 3 4.2 Visibility 3 4.2.1 In the light. 3 4.2.2 In the dark 3 4.3 Magnetic resistance properties 3 4.4 Temperature cycling. 3 4.5 Salt spray test (with bracelet) 4 4.6 Shock-resistance properties (on watch head) 4 4.7 Water-resistance 4 4.7.1 Functional devices in shallow water 4 4.7.2 Resistance when strain is applied to crown and other setting devices .5 4.7.3 Functional devices at a water overpressure .5 4.7.4 Resistance at a water overpressure. .6 4.8 Shock-resistance properties (free-fall) .6 4.9 Resistance of attachments . . 6 4.10 Condensation test. 5 Marking .7 6 Usage and maintenance recommendations ..7 Annex A (normative) Divers' watches for saturation diving. . Annex B (informative) Air-resistance at an air overpressure ..9 Annex C (informative) Diving chart .10 Annex D (informative) Usage and maintenance recommendations ..11 Bibliography .12 @ IS0 2018 - All rights reserved iii