ISO INTERNATIONAL STANDARD 291 Fourth edition 2008-05-01 Plastics Standard atmospheres for conditioning and testing Plastiques Atmospheres normales de conditionnement et d'essai Reference number ISO 291:2008(E) @ ISO 2008 ISO 291:2008(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 shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In COPYRIGHTPROTECTEDDOCUMENT @ ISO2008 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 memberbody in the country of the requester. ISO copyright office Case postale 56.CH-1211Geneva 20 Tel. + 4122 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland ii @ ISO 2008 - All rights reserved ISO 291:2008(E) Contents Page Foreword. 1 Scope 2 Normative references 3 Terms and definitions.. 4 Principle.. 5 Standard atmosphere. 6 Classes of standard atmosphere . 7 Standard and ambient temperatures .. 8 Procedure. Annex A (normative) Attainment of moisture equilibrium by plastics in a conditioning atmosphere.... 4 Annex B (informative) Background information Bibliography... Iso2008-All rightsreserved ii