ISO INTERNATIONAL STANDARD 27769 First edition 2016-12-15 Wood-based panels Wet process fibreboard Panneaux a base de bois-Panneau de fibres obtenu par procedé humide Referencenumber ISO 27769:2016(E) ISO @IS0 2016 IS0 27769:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8. CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org i @ IS0 2016 - All rights reserved IS027769:2016(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normativereferences 3 Terms and definitions 4 Abbreviatedterms ..2 5 Classifications, designation and coding .2 5.1 General .2 5.1.1 Classification matrices .2 5.1.2 Structural grades .3 5.2 Softboards .3 5.3 Hardboards .3 Mandatory tests relating to each grade 6 6.1 General ..4 6.2 Softboards 4 6.3 Hardboards ..4 6.4 Supplementary properties. .4 ..5 7 Thickness ranges. 7.1 Specification values. .5 7.2 Softboards .5 7.3 Hardboards .5 Expression of specification limits and general requirements .5 8.1 Expressionofspecificationlimits .5 8.2 Lowerspecification limits .6 8.3 Upper specification limits. .6 8.4 Density variation, dimension and moisture content requirements .6 .7 9 Requirementsforsoftboards 9.1 Requirements for general purpose softboard for use in dry conditions 7 9.2 Requirements for general purpose softboard for use in humid conditions 7 9.3 Requirementsfor general purpose softboard forusein high-humidity conditions .7 9.4 Requirementsfor general purpose softboard foruse in exteriorconditions 7 9.5 Requirements forload-bearing softboard forusein dry conditions 9.6 Requirementsforload-bearing softboard foruseinhumidconditions .8 10 Requirements for hardboards. .8 10.1 Requirements for general purpose hardboard for use in dry conditions .8 10.2 Requirements forgeneral purposehardboard for use in humid conditions 9 10.3 Requirements for general purpose hardboard for use in high-humidity conditions .9 10.4 Requirementsforgeneralpurposehardboard foruseinexterior conditions. 9 10.5 Requirements for load-bearing hardboard for use in dry conditions. ..10 10.6 Requirements for load-bearing hardboard foruse inhumid conditions ..10 Annex A (normative) Calculation of5-percentile and 95-percentile values .12 Bibliography .14 @ IS0 2016 - All rights reserved ili IS0 27769:2016(E) Foreword Iso (theInternational Organization for Standardization)is a worldwidefederation ofnational standards bodies (Iso member bodies). The work of 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 withIso,also take part in the work. ISoO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnicalstandardization. The procedures used to develop this document and those intended for its further maintenance are described in the Iso/IEc Directives, Part 1. In particular the different approval criteria needed for the different types of IsO documents should be noted.This document was drafted in accordance with the editorialrulesoftheISo/IECDirectives, Part2 (seewww.iso.org/directives) Attention is drawn to thepossibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. Details of anypatent rights identified duringthe