ISO INTERNATIONAL STANDARD 8656-1 First edition 1988-12-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATIONINTERNATIONALEDENORMALISATION MEXKAYHAPOAHAROPTAHW3ALMANOCTAHAAPTM3AUMM Refractory products - Sampling of raw materials and unshapedproducts. Part 1: Samplingscheme Produits refractaires -Echantillonnage des matieres premieres et des materiaux non faconnespreparés- Partie 1:Schemad'échantillonnage Reference number ISO 8656-1 : 1988 (E) 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 normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has 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 the ISo Council. They are approved in accordance with ISO procedures requiring at 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 Samplingof rawmaterials and unshapedproducts: Part1:Samplingscheme Part2:Determinationofthecoefficientofvariation Annex A forms an integral part of this part of ISO 8656. International OrganizationforStandardization,1988 ? Printed in Switzerland i INTERNATIONALSTANDARD ISO8656-1:1988 (E) Refractory products - $ Sampling of raw materials and unshaped products - Part 1: Sampling scheme 1 Scope 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 ISo 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- tities or cargoes from which reliable samples cannot be taken. 3.4 packaged unit: Packaged part of a lot (for example, in a 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. ora 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: Quantityof material taken at one time from 2 Normativereferences 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 ISO8656.At the timeof 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- tain registers of currently valid International