6999 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAA OPTAHM3AUWA HO CTAHAAPTM3ALWM+ORGANISATION INTERNATIONALE DE NORMALISATION ANsl Iniernat Doc Sect Carbonaceous materials for the production of aluminium - Pitch for electrodes - Determination of density - Pyknometric method Produits carbones utilises pour la production de I'aluminium Braipourélectrodes-Déterminationdelamassevolumique Methodepycnometrique First edition - 1983-12-15 UDC 665.777 : 669.713 : 531.754.4 Ref. No.1SO 6999-1983(E) 6999-1983 Descriptors : aluminium, production, pitch (materials), electrodes, tests, determination, density (mass/volume), pyknometric analysis, test equipment. OS Price based on 3 pages Standardizatior No reproduction or networking permitted without license from IHS Not for Resale Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (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 authorized 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 circutated to the member bodies for approval before their acceptance as International Standards by the Iso Council. International Standard ISO 6999 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in Juty 1982. It has been approved by the member bodies of the following countries : Australia Hungary South Africa, Rep. of Austria India Spain Belgium Italy Sweden Canada Korea,Rep.of Switzerland China Netherlands Thailand Czechoslovakia New Zealand USA Egypt, Arab Rep. of Nigeria USSR France Portugal Germany, F.R. Romania The member body of the foliowing country expressed disapproval of the document on technical grounds : United Kingdom @International Organization for Standardization, 1983 Printed in Switzerland Copyright International Organization for Standardization No reproduction or networking permited without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 6999-1983 (E) Carbonaceous materials for the production of aluminium - Pitch for electrodes - Determination of density - Pyknometric method 0 Introduction 4.2 Acetone. Thedensityofpitchusedforpreparationof electrodesforthe 4.3 Non-ionic wetting agent, 0,1 % (m/m) aqueous productionofaluminiumisapropertywhichgivesaguidetoits solution. consistencyofquality.Knowledgeofthisparameterisessential foroptimumuseofpitch. 5 Apparatus 1 Scope and field of application Ordinary liaboratory material and ThisInternational Standardspecifiesapyknometric methodfor 5.1 Pyknometer, Gay-Lussac, type 3, determination of density of pitch used for preparation of elec- capacity 25 ml trodes for use in the aluminium industry. (seeISO3507). 5.2 Vacuum pump, fitted with safety valve and filter, References capacity about 1 m3/h, capable of producing a residual pressure of 33 mbar. Iso3507.Pyknometers iso 5725, Precision of test methods 5.3 Airtight container, to hold the pyknometer (5.1) Determination of repeatability and reproducibility by inter-laboratory tests. capable of being maintained under vacuum during the deter- mination and fitted with a suitableseparating funnel. Iso6257,Carbonaceous materials used in theproductionof aluminium -- Pitch for electrodes --. Sampling. WARNING When under vacuum, place behind a suitable safety screen. 3Principle A typical assembled apparatus is shown in the figure. Measurement, by a pyknometric method, of the density of 5.4 Electric oven, capable of being controlled at pitch at 25 °C, after degassing under vacuum. 120±2°C. 5.5Water bath, capable of beingcontrolled at 4 Reagents and materials 25±0,05°C. During the determination, use only reagents