ISO INTERNATIONAL STANDARD 8398 First edition 1989-07-01 ANsr Internat Doc Sect Solid fertilizers -- Measurement of static angle of repose Engrais solides -- Mesurage de I'angle du talus d'éboulement Reference number ISO 8398 : 1989 (E) No reproduction or networking permitted without license from IHS Not for Resale ISO8398 : 1989 (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. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. so 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 the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8398 was prepared by Technical Committee ISO/TC 134, Fertilizersand soil conditioners. ISO1989 means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher International Organization for Standardization Casepostale56.CH-1211Geneve20·Switzerland Printed in Switzerland Copyright Inter national Organizati No reproduction or networking permitted without license from IHS Not for Resale ISO8398 : 1989 (E) INTERNATIONAL STANDARD Solid fertilizers -- Measurement of static angle of repose Scope 5 Apparatus This International Standard specifies a method for the Only the dimensions given in the text are mandatory. measurement of the static angle of repose of solid fertilizers. The method is applicable to free flowing fertilizers and is The apparatus (see figure 1) shall be composed of the following suitable for measuring static angles of repose greater than 20o ; parts: the method is not suitable for materials which contain a large proportion of particles exceeding 5mm in diameter. 5.1 Funnel, of rigid plastics or stainless steel, having a spout of internal diameter 25 mm and fitted with a slide. NOTE-The measurement of the static angle of repose is of import ance for the calculation of storage capacities.The angle measured ac- NOTE - The funnel llustrated in figure 1 is identical to that specified in cording to this method is normally the maximum value resulting in ISO3944. practice. For the determination of the dynamic angle of repose (angle of slide) other methods (e.g. a tilting box method) are available. 5.2 Square base-plate, 750 mm × 750 mm, of rigid con struction, made of metal, plastic or wood. The base-plate shall 2 Normative references be plain, undeformable and damp-proof. Its surface shall not be polished but shall be matt; if necessary, this condition can be The following standards contain provisions which,through achieved by fixing a suitable filter paper on the surface of the reference in this text,constitute provisions of this International base-plate. Four straight lines shall be drawn at angles of 45° to Standard. At the time of publication, the editions indicated each other, intersecting at the centre of the plate. were valid. All standards are subject to revision, and parties to agreementsbasedonthisInternationalStandardareencouraged 5.3 Funnel support, comprising a frame of substantial to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO construction to support the funnel (5.1) so that the axis of the maintain registers of currently valid International Standards. funnel passes through the centre of the base-plate