ISO INTERNATIONAL STANDARD 8656-1 First edition 1988-12-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION so ORGANISATION INTERNATIONALE DE NORMALISATION ANsl Internat Doc Sec! Refractory products -- Sampling of raw materials and unshaped products - Part 1: Sampling scheme Produits refractaires -- Echantillonnage des matieres premieres et des materiaux non faconnes preparés -- Partie 1: Schema d'échantillonnage Reference number ISO 8656-1 : 1988 (E) Copyright International Organization for Standardization Not for Resale ISO 8656-1 : 1988 (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 normaily carried out through ISO technical committees. Each member the right to be represented on that committee. International organizations, govern- mental 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by least 75 % approval by the member bodies voting International Standard ISO 8656-1 was prepared by Technical Committee ISO/TC 33, Refractories. ISO 8656 consists of the following parts, under the general title Refractory products Sampling of raw materials and unshaped products: Part 1: Sampling scheme Part 2: Determination of the coefficient of variation Annex A forms an integral part of this part of Iso 8656. International Organization for Standardization, 1988 Printed in Switzerland ii Copyright International Organization for Standardization ense from IHS Not for Resale ISO 8656-1 : 1988 (E) INTERNATIONAL STANDARD Refractory products - Sampling of raw materials and unshaped products - Part 1: Sampling scheme 1 Scope 3.2 consignment: Quantity of material supplied at one time. A consignment may consist of one or several lots or parts of a lot. This part of IS 8656 specifies methods and conditions of sampling for raw materials and prepared unshaped refractory 3.3 test lot: Specific quantity subjected to inspection products, in order to indicate the mean values of a consign- (checking), manufactured normally by a supplier in conditions ment and the interval of sampling. which can be assumed to be uniform It does not apply to products in the form of large static quan 3.4 packaged unit : Packaged part of a lot (for example, in a tities or cargoes from which reliable samples cannot be taken. sack or small container). The type of sampling equipment, and the preparation and reduction of the samples, which should not alter the properties 3.5 sample: Quantity of material taken from a consignment to be tested, are to be agreed between the interested parties. or a lot, intended to supply information, and possibly serve as a basis for a decision concerning the consignment or lot or the NOTE -- Difficulties may be encountered when sampling certain types process by which it has been produced. of unshaped products, for example mouldables. 3.6 increment: Quantity of material taken at one time from 2 Normative references a larger quantity of material. The following standards contain provisions which, through 3.7 standard deviation of sampling: Standard deviation of reference in this text, constitute provisions of this part of the random variations introduced into the measurement of a IsO 8656. At the time of publication, the editions indicated chosen property by sampling. were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 8656 are encouraged to 3.8 bulk sample: The aggregation of the increments. investigate the possibility of applying the most recent editions of the standards listed below. Members of iEC and iSO main- partial sample: Sample ob