TSO) NTERNATIONAL STANDARD 3393 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEK.IYHAPO,IHA OPrAHW3AlIMS IIO CTAHIAPTH3AlNW.ORGANISATION INTERNATIONALE DE NORMALISATION Cryolite, natural and artificial, and aluminium fluoride for industrial use -- Determination of moisture content - Gravimetric method Cryolithe, naturelle et artificielle, et fluorure d'aluminium a usage industriel -- Détermination de I'humidite--Methodegravimetrique First edition -. 1976-08-01 ANSl onrt oc e UDC 661.862.36 : 543.712 Ref. No. ISO 3393-1976 (E) Descriptors : chemical compounds, cryolite, aluminium fluorides, chemical analysis, determination of content, humidity Price based on 2 pages Copyright International Organization for Standardization Notfor Resale FOREWORD ISO (the International Organization for Standardization) is a woridwide federation of national standards institutes (isO Member Bodies). The work of developing Internationai 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, also 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. StandardISO 3393 drawn up by Technical Committee International was Chemistry, and was circulated the Member Bodies ISO/TC 47, to in August 1974. It has been approved by the Member Bodies of the following countries : India South Africa, Rep. of Austria Belgium Ireland Spain Bulgaria Israel Sweden Chile Italy Switzerland Egypt, Arab Rep. of Netherlands Turkey New Zealand United Kingdom France Germany Portugal U.S.S.R Hungary Romania Yugoslavia No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1976 Printed in Switzerland Copyright International Organization for Standardization Not for Re ISO 3393-1976 (E) INTERNATIONAL STANDARD Cryolite, natural and artificial, and aluminium fluoride for industrial use - Determination of moisture content -- Gravimetric method 1 SCOPE AND FIELD OF APPLICATION 5.2 Determination This International Standard specifies a gravimetric method Regulate the temperature of the oven (4.2) at 110 ± 5 °c Insert the weighing bottle containing the test portion (5.1) for determination of the moisture content of cryolite, with its lid resting on top without closing the bottle, and natural and artificial, and aluminium fluoride for industrial a watch-glass of diameter slightly greater than that of the use. weighing bottle. After drying for 2 h, replace the lid by the watch-glass and transfer all to a desiccator. After 2 REFERENCES close the weighing bottle with 'its lid and cooling, weigh to the nearest 0,001 g.. Iso 1619, Cryolite, natural and artificial--. Preparation and storage of test samples. 6 EXPRESSION OF RESULTS ISO 2925, Aluminium fluoride for industrial use - Prepa- ration and storage of test samples. The moisture content is given, as a percentage by mass, by the formula. 3 PRINCIPLE mo Drying of a test portion for 2 h at 110 °C and determina- tion of the loss in mass. where mo is the mass, in grams, of the test portion (5.1); 4 APPARATUS m1 is the mass, in grams, of the weighing bottle Ordinary laboratory apparatus, and with its lid, containing the test portion after drying; 4.1 Weighing bottle, squat form, of diameter about m2 is the mass, in grams, of the weighing bottle, with its lid, containing the test portion before drying. 45 mm. 4.2 Electric oven, capable of being controlled at 7 TEST REPORT 110±5°C. The test 'report shall include the following particulars : 5 PROCEDURE a) the reference of the method used; b) the results and the method of expression used; 5.1 Test portion c) any unusual features noted during the. determina Weigh, to the n