ISO INTERNATIONAL STANDARD 8890 First edition 1988-04-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION So ORGANISATION INTERNATIONALEDE NORMALISATION MEXKAYHAPOAHAA OPAHW3ALMH NO CTAHAAPTM3ALMM ANsi Internat Doc Sect Dense shaped refractory products - Determination of resistance to sulfuric acid Produits refractaires faconnes denses - Determination de la resistance a I'acide sulfurique Reference number ISO 8890 : 1988 (E) ISO 8890 : 1988 (E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. internationai organizations, govern- mental and non-governmental, in liaison with ISo, also take part in the work. IsO collaborates closely with the International. Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by least 75 % approval by the member bodies voting. International Standard ISO 8890 was prepared by Technical Committee iSO/TC 33, Refractories. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. International Organization for Standardization, 1988 ? Printed in Switzerland Copyright International Organization for Standardization Not for Resale ISO 8890 : 1988 (E) INTERNATIONAL STANDARD Dense shaped refractory products - Determination of resistance to sulfuric acid Scope and field of application 4.3 Woven metal wire cloth sieve, 0,63 mm aperture, con- forming to the requirements of IS0 565 (supplementary size This International Standard specifies a method for determining list). the resistance of dense shaped refractory products to attack by suifuric acid. 4.4 Balance, capable of weighing 25 g to the nearest NOTE -- Sulfuric acid is used since it gives results which are typical of 0,001 g. the results of exposing refractory materials to many acids other than hydrofluoric acid. 4.5 Round-bottomed flasks, of capacity 500 ml (see Iso 1773), each with a short, narrow neck, equipped with a ground glass stopper (see Is 383) for the insertion of a 2 References thermometer. Iso 383, Laboratory glassware -- Interchangeable conical 4.6 Coil condensers, of length 250 mm, having at least 16 ground joints. turns in the coil (see ISO 4799). Iso565,Testsieves-Wovenmetalwireclothandperforated plate - Nominal sizes of apertures. 4.7 thermometers (length Immersion approximately 110 mm) (see IS0 1770). ISo 1770, Solid-stem general purpose thermometers. Iso 1773, Laboratory glassware -- Boiling flasks (narrow- 4.8 Sand bath or oil bath. necked). Iso 4799, Laboratory glassware - Condensers. 4.9 Porcelain filter crucible. iso5022,Shapedrefractoryproducts-Samplingandaccep- Thermostatically controlled oven, capable of main- 4.10 tance testing. taining a temperature of 110 ± 5 °C. 3 Principle 5 Reagents The test sample, crushed in a specified manner, is subjected for During the test, use only reagents of recognized analytical 6 h to attack by 70 % (m/m) boiling sulfuric acid, and the grade and only distiled water or water of equivalent purity. resultant mass loss is determined and expressed as a percen- tage of the initial mass of the dry material. 5.1 Sulfuric acid, 70 % (m/m), @15 = 1,615 g/cm3. Apparatus 4. 5.2 Barium chloride, 50 g/l solution. Ordinary laboratory apparatus and 6 Test samples 4.1 Suitable mechanical crushing device, preferably not steel. The number of samples to be taken shal! be in accord. ance with IS0 5022 or with another standard sampling