ISO INTERNATIONAL STANDARD 287 Fourth edition 2017-11 Paper and board Determination of moisture content of a lot Oven- drying method Papier et carton -Détermination de la teneur en humidité d'un lot MéthodeparséchageaI'étuve Reference number IS0 287:2017(E) ISO IS02017 IS0 287:2017(E) Contents Page Foreword iv Introduction 1 Scope. 2 Normative references. 1 3 Terms and definitions 4 Principle. 5 Apparatus 6 Preparation of containers 2 7 Sampling. 8 Selection, preparation and weighing of test pieces. 8.1 General 8.2 If the unit is a package that can be and may be unwrapped, or is in an unwrapped form 8.2.1 Whentheunitisnotsubdividedandnotareel 8.2.2 Whentheunitiscomposedofelements. 8.2.3 When the unit is a reel. 8.3 When the unit is a package that cannot or should not be completely unwrapped 5 8.3.1 Average moisture content for samples with known machine direction. 8.3.2 Average moisture content for samples with unknown machine direction 8.3.3 Variations in moisture content of sheets or across the reel. 9 Procedure 9.1 Initial drying and weighing. 9.2 Drying and weighing to constant mass 10 Calculation and expression of results 10.1 Calculation 10.2 Expression of results. 11 Test report. 11.1 General 11.2 When an average moisture content is required 11.3 When a variation in moisture content is required Annex A (informative) Precision data Bibliography 10 @ IS0 2017 - All rights reserved ii IS0 287:2017(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national 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 with Iso, also take part in the work IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 editorial rules of the ISO/IEc Directives, Part 2 (see wwwiso.org/directives). Attention is drawn to the possibility 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 any patent rights identified during the development of the document will be in the Introduction and/or on the Iso list of patent declarations received (see wwwiso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of Iso specific terms and expressions related to conformity assessment, as well as information about Iso's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see the following URL: Wwwiso.org/iso/foreword.html This document was prepared by TechicalrCommitteeaIso/Tc 6, Paper board and pulpsh Sttbcommittee Sc 2, Test methods and quality specifications for paper and board. This fourth edition cancels and replaces the third edition (Is0 287:2009), which has been technically revised. The main changes compared to the previous edition are as follows: precision data (previously in Clause 11) have been moved to Annex A; editorial changes have been made for clarification and removal of inconsistencies. iv IS0 2017 - All rights reserved