5444 NTERNATIONAL STANDARD TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAR OPTAHM3ALMR O CTAHAAPTW3ALWM?ORGANISATION INTERNATIONALE DE NORMALISATION ANsi Internat Doc Secf Sodium hexafluorosilicate for industrial use - Determination of loss in mass at 105 °c Hexafluorosilicate de sodium a usage industriel -- Determination de la perte de masse a 105 °c First edition -- 1978-11-15 NOV161978 ISO 5444-1978 (E) UDC661.488:543.71 Ref.No.ISO5444-1978 (E) Descriptors : chemical compounds, sodium fluorosilicates, physical tests, determination, mass loss by heating, gravimetric analysis. Price based on 2 pages FOREWORD ISO(theInternationalOrganizationforStandardization)isaworldwidefederation 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, 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 tnternational Standards by the ISo Council. International Standard Iso 5444 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in July 1976. It has been approved by the member bodies of the following countries : Belgium Israel South Africa, Rep. of Brazil Italy Spain Chile Korea, Rep.of Switzerland Czechoslovakia Mexico Thailand France Netherlands Turkey Germany, F.R. Philippines UnitedKingdom Hungary Poland U.S.S.R. India Romania Yugoslavia No member body expressed disapproval of the document. This International Standard has also been approved by the International Union ofPureandAppliedChemistry(IUPAC). International Organization for Standardization,1978 Printed in Switzeriand license with ISO ISO5444-1978 (E) INTERNATIONAL STANDARD Sodium hexafluorosilicate for industrial use -- Determination of loss in mass at 105 °c with eyes and skin should be prevented and operators should wash thoroughly after handling the material and should wear a respirator and goggles when handling the powdered material. 1 SCOPEANDFIELDOFAPPLICATION bottle, place this assembly and the stopper in a desiccator and allow to cool. Close the weighing bottle with its This International Standard specifies a gravimetric method stopper and weigh to the nearest 0,001 g. for the determination of the loss in mass at 105 °c of sodium hexafiuorosilicate for industrial use. NOTE - Retain the dried test portion for the other determinations on sodium hexafluorosilicate (see the annex). The method is applicable to the determination of losses in mass at 105 °c equal to or greater than 0,008 % (m/m). 5EXPRESS!ONOFRESULTS 2 PRINCIPLE mass, is given by the formula Drying of a test portion at 105°c for 6h and determi- nation of the loss in mass. m,-mo 3APPARATUS where Ordinary laboratory apparatus and mo is the mass, in grams, of the dried weighing bottle, 3.1 Electric oven, capable of being controlled with stopper; at 105±1. m, is the mass, in grams, of the weighing bottle, stopper and test portion, before drying; 3.2 Glass weighing bottle, of height approximately 30 mm m2 is the mass, in grams, of the weighing bottle, and diameter approximately 60 mm. stopper and test portion, after drying. 4PROCEDURE 6 TEST REPORT Remove the stopper from the weighing bottle (3.2) and The test report shall include the following particulars : dry both components in the oven (3.1), controlled at 105 ± 1 °c, for 1 h. Allow the weighing bottle and stopper a) an identification of the sample; to cool in a desiccator,fit the stopper and weigh to the b) the reference of the method used; nearest 0,001 g. Weigh, to the nearest 0,001 g, about 50 g of the laboratory c) the results and the method of expression used; sampl