ISO INTERNATIONAL STANDARD 16979 First edition 2003-05-01 Wood-based panels Determination of moisturecontent Panneauxabasedebois-Determinationde Ihumidite Reference number ISO16979:2003(E) ISO @ISO2003 ISO16979:2003(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the sofware products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ ISO2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's member body in the country of the requester. ISO copyright office Casepostale56.CH-1211Geneva20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ISO2003—All rights reserved ISO16979:2003(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies International Electrotechnical Commission (IEC)on all matters of electrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requiresapproval by at least75%of thememberbodies castinga vote. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO16979waspreparedbyTechnicalCommitteeISO/TC89,Wood-basedpanels ISO2003-All rights reserved ii ISO16979:2003(E) Introduction This International Standard is based on European Standard EN 322. It cancels and replaces ISO 9425:1989 which has been extendedto include provisions for sampling and cutting of test pieces iv @ISO2003—All rights reserved ISO 16979:2003(E) INTERNATIONALSTANDARD Wood-based panels Determination of moisture content Scope 1 This International Standard specifies a methodfordetermining the moisture content of wood-based panels. Normativereferences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including anyamendments)applies. IsO16999,Wood-basedpanelsSamplingandcuttingoftestpieces 3 Principle Determination, by weighing, of the loss of mass of each test piece between its state at the time of sampling of the mass of the test piece after drying. 4 Apparatus 4.1 Balance, with a scale interval of 0,01 g. 4.2 4.3 Desiccator, containing silica gel, to maintain the air as close as possible to the absolutely dry condition. 5 Test pieces 5.1 Sampling and cutting cover the full thickness of the panel. 5.2 Massanddimensions The test piece shall have a minimum mass of 20 g. The shape and size of the test piece are unimportant. The testpieces shall be freefrom loose splinters and sawdust. @ ISO 2003-All rights reserved 1 ISO16979:2003(E) 6 Procedure 6.1 Weighing before drying Weigh each test piece in the as-sampled state, to an accuracy of o,o5 % of the mass of the testpiece This initial weighing shall be carried out immediately after sampling. Where this is impossible, precautions 6.2[ Drying Place the test pieces in the drying oven (4.2) at a temperature of (103 ± 2) C until constant mass has been reached. 6.3Weighingafter drying test piece to an accuracy of 0,o5 % of the mass of the test piece, rapidly enough to avoid an increase in moisture content. 7 Expressionofresults Calculate the moisture content, H, of each test piece, as a per