G--1 3713-87 4851903 0027519 2 ISO INTERNATIONAL STANDARD 3713 First edition 1987-12-15 INTERNATIONALORGANIZATIONFORSTANDARDIZATION ORGANISATIONINTERNATIONALEDENORMALISATION MEXKAYHAPOAHAA OPFAHM3ALMRO CTAHAAPTW3ALMM Ferroalloys - Sampling and preparation of samples : General rules Ferro-alliages - Echantillonnage et preparation des échantillons -- Regles generales Referencenumber ISO 3713: 1987 (B) CoPYRIGHT International Organization for Standardization 3713-87 4851903 0027520 9 Foreword ISO(theInternational OrganizationforStandardization)isaworldwidefederationof national standards bodies (IsO member bodies). The work of preparing International Standardsisnormallycarried outthroughiSOtechnical committees.Eachmember bodyinterested inasubjectforwhichatechnical committeehasbeenestablishedhas therighttobe representedonthatcommittee.International organizations,govern- mentalandnon-governmental,inliaisonwithisO,alsotakepartinthework, Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with Iso procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 3713 was prepared by Technical Committee ISO/TC 132, Ferroalloys. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. @ International Organization for Standardization, 1987· Printed in Switzerland ii COPYRIGHT International Organization for Standardization Licensed by Information Handling Services 3713-87 48519030027521 0 ISO 3713 : 1987 (E) Contents Page 1 Scope and field of application 2 References 3 Definitions 4. General. 4.1 Heterogeneity of consignment. 2 4.2 Overall precision. 4.3 Samplingandsamplepreparation 5Sampling. 5.1 Types of sampling . 5.2 Mass of an increment . 3 5.3 Number of increments 3 5.4 Mechanical method of increment sampling 5 5.5 Manual method of increment sampling 6 5.6Sampling a consignment in a packed form. 6 5.7 Methods of combining increments 6 Sample preparation. 6.1 Succession of sample preparation. 6.2 Precision of sample preparation 6.3 Crushing . . 6.4 Mixing 6.5Division. 8 6.6 Sample preparation for the determination of size composition . 9 7 Main devices and tools for sampling and sample preparation . . 9 8Testsample. 10 8.1 Prevention of contamination 10 8.2 Samples for determination of chemical compositon of a consignment ... . 10 ii IGHTInternationalOrganizationforStandardization nsedbyInformationHandlingServices