ISO INTERNATIONAL STANDARD 8264 First edition 1989-11-15 Hard coal - Determination of the swelling properties using a dilatometer Houille - Determination des proprietes de gonflement a I'aide d'un dilatometre Reference number 1SO 8264 : 1989 (E) No reproduction or networking permitted without license from IHS Not for Resale ISO8264: 1989 (E) Foreword ISso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standardsis normallycarried outthroughIsOtechnical committees.Eachmember 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 So, also take part in the work. IsO collaborates closelywiththeInternationalElectrotechnicalCommission(lEC)onall mattersofelectrotechnical 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 8264 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels. @ISO 1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland Noreproductionornetworkingemitedwithout licensefromHS ed by IHS t Not fr Resale 1SO 8264 : 1989 (E) Introduction The Audibert-Arnu dilatometer test was adopted as ISO Recommendation ISO/R349:1963 which was transformed into an International Standard tests, using slightly different equipment and techniques, were used in various coun- tries. One test in widespread use was that which measures the swelling properties of hard coal using the Ruhr diatometer. A thorough survey of the construction and operation of this instrument was made between 1973 and 1978 by a working group in the United Kingdom. Eleven laboratories participated in the work, including two which operated the Audibert-Arnu dilatometer as described in Iso 349. In the course of considerable inter-laboratory testing, the results indicated that values of contraction and dilatation found with the Audibert- Arnu dilatometer were higher and lower respectively than those found with the modified Ruhr dilatometer (the version described in this International Standard). test piece is removed from the wider end in the Audibert version of the dilatometer test and from the narrower end in the Ruhr version. The latter procedure ensures a test piece of greater and more uniform volume. It is not intended that Iso 349 be withdrawn immediately, however it is suggested that the test be gradually phased out and replaced by that described in this International Standard, a test which has been tried and proven, particularly in the United Kingdom and the Federal Republic of Germany, and shown to be reliable and suitable for measuring the swelling properties of all types of hard coal. Copyright Intemational Organization for Standardization ili No reproduction or networking permited without license from IHS Not fr Resale