ISO INTERNATIONAL STANDARD 10725 First edition 2000-12-15 Acceptance sampling plans and procedures for the inspection of bulk materials Plans et procédures d'eéchantillonnage pour acceptation pour le controle de materiauxenvrac Reference number ISO 10725:2000(E) SO @ ISO 2000 yIHS under Not for Resale ISO 10725:2000(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 downloading this area. Adobe is atrademarkofAdobeSystems 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 the unlikely event @ISO2000 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.ch Printed in Switzerland Iso2000-All rightsreserved itted without license from IHS Not for Resale ISO 10725:2000(E) Contents Page Foreword. vi Introduction .vii Scope 2 Normative references .. Terms and definitions 4 Symbols and abbreviated terms .. 3 5 Sampling plans. 5.1 General.. 5.2 Applicability... 5.3 Standardized sampling procedures.. 5.4 Standarddeviations... 5.5 Costs.. 5.6 Acceptance quality limit and non-acceptance quality limit 10 5.7 Responsible authority.... 6 Inspection procedure: 12 6.1 General... 12 6.2 Assessment of the standard deviations.. 6.3 Determination of sample sizes...... 18 6.4 Selectionandpreparationofsamples 21 6.5 Determination of the acceptance value.. 30 6.6 Determination of lot acceptability ... 31 7 Examples... 32 7.1 Imprecise standard deviation with one-sided specification limit... 7.2 Imprecise standard deviation with two-sided specification limits 33 7.3 Optional procedure for known standard deviation with one-sided specification limit. .34 7.4 Known standard deviation with one-sided specification limit..... .35 7.5 Known standard deviations with two-sided specification limits. 7.6 Revision of discrimination interval.... 38 7.7 Results from one lot.... 39 7.8 Results from consecutive lots........... Annex A (normative) Special procedures for inspecting multiple characteristics of a material.. .42 standard deviation is dominant.... .47 Annex C (informative) Theoretical background .52 Annex D (informative) Operating characteristic curves. Bibliography 72 Figure 1 - Schematic model of bulk acceptance sampling procedures .8 Figure C.1 - Relationship between mA, mR and acceptance value (Distribution of x..; lower specification limit) ... Figure C.2 - Relationship between mA, mR and acceptance value (Distribution of x..,; upper specification limit) .... 57 ili se from IHS Not for Resale