ISO 18842:2015

INTERNATIONAL ISO
STANDARD 18842
First edition
2015-08-15
Aluminium oxide primarily used
for the production of aluminium —
Method for the determination of
tapped and untapped density
Oxyde d’aluminium principalement utilisé pour la production
d’aluminium — Méthode de détermination de la masse volumique
tassée ou inexploitée
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Apparatus . 1
5 Sample handling and preparation . 2
6 Procedure. 2
6.1 Moisture determination . 2
6.2 Untapped bulk density determination . 2
6.3 Tapped bulk density determination . 3
7 Calculation and reporting of results . 3
8 Precision . 3
9 Test report . 4
Bibliography . 7
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, governmental 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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 226, Materials for the production of primary aluminium.
iv © ISO 2015 – All rights reserved

Introduction
This International Standard is based on the Australian Standard AS 2879.8.
INTERNATIONAL STANDARD ISO 18842:2015(E)
Aluminium oxide primarily used for the production of
aluminium — Method for the determination of tapped and
untapped density
1 Scope
This International Standard describes methods for the determination of tapped and untapped bulk
density of smelter grade aluminium oxide primarily used for the production of aluminium.
Methods using the fall of sample into a receptacle have been found to be sensitive to flow rate variations,
which are caused by physical properties of the aluminium oxide.
This International Standard minimizes flow rate variations.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 806, Aluminium oxide primarily used for the production of aluminium — Determination of loss of mass
at 300 °C and 1 000 °C
AS 4538.2, Guide to the sampling of alumina — Preparation of samples
3 Principle
A test portion of the sample is allowed to fall in a narrow stream from a container onto a small metal
impact plate from which the stream
...