(TSO 4324 NTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXKIYHAPOAHA OPIAHW3ALIWS HIO CTAHIAPTH3ALIWH.ORGANISATION INTERNATIONALE DE NORMALISATION Surface active agents -- Powders and granules -- Measurement of the angle of repose Agents de surface - Poudres et granules -- Mesurage de I'angle du talus d'éboulement First edition -- 1977-09-01 ISO 4324-1977 (E) Ref. No. ISO 4324-1977 (E) UDC 661.185 : 539.215.9 Descriptors : surfactants, pulverulent products, granular materials, tests, physical tests, measurement, angle of repose, flow. Price based on 3 pages Copyright International Organization for Standardization d without license 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 International Standards is carried out through IsO technical committees. Every 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 International Standards by the iSO Council. StandardIsO 4324wasdeveloped by Technical Committee International ISO/TC91, Surface active agents, and was circulated to the member bodies in October 1975 It has been approved by the member bodies of the following countries : India Portugal Australia Austria Iran Romania Belgium Italy South Africa, Rep. of Brazil Japan Spain Canada Korea, Rep. of Switzerland Egypt, Arab Rep. of Mexico Turkey United Kingdom France Netherlands U.S.A. Germany New Zealand Hungary Poland U.S.S.R. No member body expressed disapproval of the document. @ International Organization for Standardization, 1977 : Printed in Switzerland ed without license from IHS Not for Resale ISO 4324-1977 (E) INTERNATIONAL STANDARD Surface active agents - Powders and granules - Measurement of the angle of repose 5.1 Measuring equipment, consisting of the following 0 INTRODUCTION parts (see the figure) : Determining the angle of repose of powders and granules may give information on the storage properties of the 5.1.1 Glass funnel, having an internal stem diameter of powder, especially in silos, etc. 10 mm. 1 SCOPE AND FIELD OF APPLICATION 5.1.2 Agitator, comprising two rods placed opposite one another along the whole length of the interior wall of the This International Standard specifies conventional funnel (5.1.1), and extending into the stem; these rods method for the determination of the angle of repose of should be capable of being turned easily by means of a surface active agents in powder or granular form and handle. of washing powders, free from agglomerates. This method is also applicable to other powders and 5.1.3 Base-plate, of minimum length 220mm and granules with comparable properties. 158mm. The base-plate shall minimum width be completely rigid and shall have a polished surface or be engraved with concentric circles of diameters of from 10 2 REFERENCES to 100 mm, the centres of which shall be coaxial with the axis of the funnel. isO 554, Standard atmospheres for conditioning and/or testing -Specifications. 5.1.4 Transparent plastic vessel, of minimum diameter IsO 607, Surface active agents -- Detergents -- Methods of 100 mm and minimum height 25 mm, placed 75 mm below sample division. 1) the lower end of the funnel (5.1.1). Its internal surface shall be slightly rough. It shall be positioned on the base- plate (5.1.3) in such a way that the centre of the vessel 3 DEFINITION and the axis of the funnel coincide, the centring being facilitated by the graduation of the concentric circles on For the purposes of this International Standard, the the base-plate. following definition applies : angle of repose : The base angle of the cone obtained by 5.1.5 Funnel support, fixed and positioned so t