1619 NTERNATIONAL STANDARD SO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·MEKIYHAPOIHA OPFAHH3ALM IO CTAHIAPTM3ALIMM·ORGANISATION INTERNATIONALE DE NORMALISATION Cryolite, natural and artificial - Preparation and storage of test samples Cryolithe, naturelle et artificielle -- Preparation et conservation des échantillons pour essai First edition -- 1976-09-15 OCT 2 5 1976 PT TTOmK UDC 553.634 : 620.11 Ref. No. ISO 1619-1976 (E) Descriptors:aluminiumores,cryolite, samples,preparation,test specimens, storage,chemicalanalysis. Price based on 2 pages Copyright International Organization for Standardization Not for Resale FOREWORD IsO (the Internationa! Organization for Standardization) is a woridwide federation of national standards institutes (ISO Member Bodies). The work of developing International Standards is carried out through ISo Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with isO, aiso take part in the work. 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. Prior to 1972, the results of the work of the Technical Committees were published as Iso Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Technical Committee ISO/TC 47 has reviewed ISO Recommendation R 1619 and found it technicaliy suitable for transformation. International Standard ISO 1619 therefore replaces 1So Recommendation R 1619-1970. ISO Recommendation R 1619 was approved by the Member Bodies of the following countries : Hungary Romania Australia Austria South Africa, Rep. of India Iran Spain Belgium Brazil Israel Sweden Canada Italy Switzerland Czechoslovakia Netherlands Turkey New Zealand United Kingdom Egypt, Arab Rep. of France Norway U.S.S.R. Germany Poland Yugoslavia Greece Portugal No Member Body expressed disapproval of the Recommendation. No Member Body disapproved the transformation of ISO/R 1619 into an International Standard. Printed in Switzeriand Copyright International Organization for Standardization from IHS Not for Resale INTERNATIONAL STANDARD 1SO 1619-1976 (E) Cryolite, natural and artificial - Preparation and storage of test samples 1 SCOPE AND FIELD OF APPLICATION The sieve shall be selected in relation to the impurity to be determined. This International Standard specifies the procedure for the preparation and storage of test samples, i.e. crude samples and dried samples, of natural and artificial cryolite, and of 3.3.2 2 Mortar, of corundum or agate. natural and synthetic materials having a molar ratio (NaF/Al F3) between 3 and 1,7 approximately.: 3.3.2.3 Electric oven, capable of being controlled at 110 ± 2 °c. 2 REFERENCE ISo..-, Cryolite, natural and artificial - Sampling.1) 3.3.3 Procedure Sieve approximately 100 g of the laboratory sample using 3 PREPARATION OF TEST SAMPLES the sieve (3.3.2.1). 3.1 Laboratory sample Grind the particles remaining in the sieve in the mortar (3.3.2.2) and sieve again. Add these sievings to the material For the preparation of the laboratory sample, use the which has previously passed through the sieve and mix method specified in IsO . carefully. 3.2 Crude sample, for the determination of certain Repeat the grinding, sieving and mixing operations until all geometric characteristics, for certain physical and physico the material is passed through the sieve. chemical tests and for moisture determination. Take approximately 300 g of the laboratory sample and Place the sample thus prepared in a platinum dish and dry place it in an airtight container of such a capacity that it is for at least 2 h in the oven (3.3.2.3) controlled at nearly filled by the sample. 110 ± 2 °c. Remove the dish from the oven