ISO INTERNATIONAL 25337 STANDARD First edition 2010-03-15 Plastics Production quality control - Statistical method for using single measurements Plastiques-Controledequaliteenproduction-Methodestatistique pour I'utilisation demesurages uniques Referencenumber ISO 25337:2010(E) @ISO2010 ISO25337:2010(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 the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHTPROTECTEDDOCUMENT ISO 2010 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 Case postale 56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2010- All rights reserved ISO25337:2010(E) Contents Page Foreword Introductior 1 Scope 2 Normativereferences 3 Terms and definitions 4 Precision of test methods.... 5 Singlemeasurementsforproductionqualitycontrolpurposes 5.1 General.... 5.2 Variabilityoftheproductionprocessandtestmethod. 5.3 Within.laboratory reproducibility...... 5.4 Calculation of sRLab from a within-laboratory reproducibility investigation. 5.5 Interpretationof single-measurementdataforproductionquality control purposes 6 Procedure .8 Annex A(informative) Example of the calculation of sRlab from a within-laboratory reproducibility investigation... .9 AnnexB(informative)Examplesoftheeffectonproduction limitsof makingduplicateand triplicatemeasurementsasopposedtosinglemeasurements.... Annex C (normative)Reducing theprobability of incorrectly accepting a nonconforming product....15 Bibliography. 17 @ ISO 2010 - All rights reserved ili ISO25337:2010(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 InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. International Standard requires approval by at least 75 % of the member bodies casting a vote. 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. SC 5, Physical-chemicalproperties. iv @ ISO 2010 - All rights reserved ISO25337:2010(E) Introduction duplicate.Insome cases,repeatedoperations arealsospecified.However,forproductionqualitycontrolitis repeated operations, as specified in many IsO standards, are time-consuming and expensive and could result in an undesirable increase in production costs. Furthermore, the laboratory /responsetimecouldalsoincrease unacceptably. This International Standard presents a statistical method for using only single measurements in a production environment, in accordance with isO test method standards which specify at least duplicate measurements and/or repeated operations.This International Standard is likely to be of interest to companies using IsO test customerspecifications/designations. Provided the statistical computations support the reduction in the number of replicates for a particular