ISO INTERNATIONAL STANDARD 12844 First edition 1999-12-15 Raw optical glass Grindability with diamond pellets Test method and classification Verre d'optique brut - Resistance a I'abrasion par palets diamantés - Methoded'essaietclassification Reference number ISO 12844:1999(E) ISO @ ISO 1999 by IHS under lic itted without license from IHS Not for Resale ISO 12844:1999(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by isO member bodies. In the unlikely event ?ISO1999 All rights reserved. Unless otherwise specified, 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 either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 734 10 79 E-mail [email protected] Web www.iso.ch Printed in Switzerland @ Iso 1999 - All rights reserved Not for Resale ISO12844:1999(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 iSsO technical 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(lEC)onallmattersofelectrotechnicalstandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. patent rights. IsO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 12844 was prepared by Technical Committee ISO/TC 172, Optics and optical instruments, Subcommittee Sc 3, Optical materials and components. ii