(ISo International Standard 528 INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAR OPFAHM3ALMR NO CTAHAAPTM3ALMW ORGANISATION INTERNATIONALE DENORMALISATION ANsI Iateraat Doc Sect Refractory products - Determination of pyrometric cone equivalent (refractoriness) Produits refractaires - Détermination de la résistance pyroscopique (refractarite) First edition --- 1983-12-01 UDC 666.76 : 620.1 : 536.4 Ref.No.ISO528-1983 (E) ISO 528-1983 (E) Descriptors:refractorymaterials,tests,determination,refractoriness,testequipment. Price based on 5 pages 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 circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. International Standard ISO 528 was developed by Technical Committee ISo/TC 33, Refractories, and was circulated to the member bodies in January 1982. It has been approved by the member bodies of the following countries : Australia India South Africa, Rep. of Austria Italy Spain Brazil Korea,Rep.of Sweden China Mexico Thailand Czechosiovakia Netherlands United Kingdom Egypt, Arab Rep. of Norway USA France Poland USSR Germany, F.R Portugal Hungary Romania The member body of the following country expressed disapproval of the document on technical grounds : Canada This International Standard cancels and replaces ISo Recommendation R 528-1966, of whichitconstitutes a technical revision. International Organization for Standardization, 1983 Printed inSwitzerland INTERNATIONAL STANDARD ISO528-1983 (E) Refractory products - Determination of pyrometric cone equivalent (refractoriness) 1 Scope and field of application dimensions and of such composition that, when mounted and heated under specified conditions, it bends in a known manner 1.1 This International Standard specifies a method for deter- with reference to the temperature. mining the pyrometric cone equivalent (refractoriness) of siliceous, low alumina fireclay and fireclay refractory materials 3.3 reference temperature; temperature of collapse : and products. The temperature at which the tip of a pyrometric reference cone reaches the level on which the base of the cone is 1.2 Its useful range of application depends on the availability mounted when the cone is heated at a specified rate under of suitable pyrometric reference cones. In the temperature specified conditions. range from 1 500 to 1 800 C, the pyrometric reference cones specified in ISO/R 1146 are suitable. 4 Principle 1.3 Although pyrometric reference cones are primarily manufactured for estimating the effect of temperature on Test pieces of refractory materials or products are raised in siliceous, lowaluminafireclayand fireclayproductswith regard temperature, under specified conditions, alongside pyrometric to their composition, the method may also be used for deter- reference cones of known refractoriness and their behaviour is mining the refractoriness of other refractory materials and pro- compared with that of the reference cones. ducts,but the results may then be not so precise. 2 References 5 Apparatus Iso 565, Test sieves -- Woven metal wire cloth and perforated 5.1 Furnace. plate - Nominal sizes of apertures. 5.1.1 The furnace used for the determination may be cylin- ISO/R 836, Vocabulary for the refractories industry. drical or rectangular and vertical or horizontal. ISo/R 1146, Pyrometric reference cones. 5.1.2 Under the test conditions, the difference in temperature between the coldest spot