OSI) 6376 International Standard ANsr internctional Unit Carbonaceous materials for the production of aluminium --- Pitch for electrodes -- Determination of content of toluene-insoluble material insolubles dans le toluene First edition - 1980-11-01 007 3 1 1980 UDC 665.775 : 669.713.7 : 543.86 Ref. No. 1SO 6376-1980 (E) ISO 6376-1980 (E) Descriptors : metal industry, aluminium, pitch, chemical analysis, determination of content, insoluble matter, toluene, gravimetric method. Price based on 2 pages Copyright International Organization for Standardization nse from IHS Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (iso member bodies). The work of developing inter- national 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 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. International Standard ISO 6376 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in September 1979. Hungary Australia Sweden Austria Italy Switzerland Belgium Korea, Rep. of Thailand Canada United Kingdom Libyan Arab Jamahiriya Philippines China USA Poland USSR Czechoslovakia Egypt, Arab Rep. of Portugal Yugoslavia France Romania Germany, F. R. SouthAfrica, Rep of The member body of the foltowing country expressed disapproval of the document on technical grounds : Netherlands This International Standard was also approved by the International Union of Pure and Applied Chemistry (IUPAC) @ International Organization for Standardization, 1980 Printed in Switzerland Copyright International Organization for Standardization e from IHS ISO 6376-1980 (E) INTERNATIONAL STANDARD Carbonaceous materials for the production of Pitch for electrodes s - Determination of aluminium content of toluene-insoluble material Scope and field of application 5.2 Reflux condenser, effective length 300 mm, having a ground glass cone (see ISo 383) at its lower end, by means of This International Standard specifies a gravimetric method for which it can be fitted to the socket of the conical flask (5.1). the determination of the content of toluene-insoluble material in pitch used for the production of aluminium. 5.3 Filter crucible, of glass, of capacity about 30 ml, fitted with a sintered glass disc (see isO 4793) of porosity grade P16 NOTE --- The content of toluene-insoluble material is commonly called (pore size index 10 to 16 μm) and having the following approx- "sum of resins α + β". imate principal dimensions : disc diameter : 30 mm 2 Reference height (disc to upper rim) : 35 mm. ISO 6257, Carbonaceous materials for the production of aluminium - Pitch for electrodes -- Sampling. 5.4 Electric oven, capable of being controlled at a temperature between 105 and 110 °C. 3Principle Determination by weighing of the fraction of a test portion of Sampling 6 pitch which is insoluble in toluene after boiling for a specified period. See ISO 6257. Reagents and materials In the case of hard pitches, grind the sample so that it passes 4 through a sieve of nominal aperture size 200 μm (see ISO 565). During the analysis, use only reagents of recognized analytical In the case of soft pitches, use the sample as received. grade. 4.1 Toluene. 7 Procedure Acetone. 4.2 WARNING - Toluene is toxic and highly flammabie Carry out all operations involving its use in an efficiently 5 Apparatus ventilated fume cupboard. Ordinary laboratory apparatus and 7.1 Test portion 5.1 Conical flask, of capacity 500 ml, of borosilicate glass, Weigh, to the nearest 0,001 g, approximately 1 g of the sample fitted with a ground glass socket (see Iso 4797). (see clause 6). Copyrigh