ISO INTERNATIONAL STANDARD 1042 Fourth edition 1998-07-01 Laboratory glassware One-mark volumetric flasks Verrerie de laboratoire - Fioles jaugees a un trait ISO Reference number ISO 1042:1998(E) by IHS under lic Not for Resale ISO 1042:1998(E) Foreword IsO (the International Organization for Standardization) is a worldwide federationofnationalstandardsbodies(lsOmemberbodies).Theworkof 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. SO 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. glassware and related apparatus, Subcommittee Sc 1, Volumetric instruments. This fourth edition cancels and replaces the third edition (iSO 1042:1983) by incorporating the following changes: a) flasks with capacities of 1, 2, 20 and 5 000 ml have been added; b) flasks with conical body shape have been added; c) flasks with wider neck have been added; d) material has been more precisely defined and a test method for capacity introduced; e) sizes of ground joints have been added in tables 1 and 2. @ISO1998 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 the publisher. International Organization for Standardization Case postale 56· CH-1211 Geneve 20 · Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; 0=isocs; S=central Printed in Switzerland Not for Resale @ ISO ISO 1042:1998(E) Introduction Volumetric flasks together with analytical balances are the fundamental tools for the preparation of volumetric standard solutions - the basis of chemical analysis. The design of narrow-necked class A volumetric flasks has been optimized to achieve the fewest possible acceptable errors. With the increasing popularity of piston-operated pipettors, there is market pressure for the manufacture of volumetric flasks with wider necks so that pipettor tips may be inserted to remove solution directly. Wide-necked flasks wili of necessity be of lower accuracy than the corresponding device may introduce other errors. are used for the production of standard solutions and where necessary, a suitable quantity should be poured into an intermediate vessel into which the pipettor tip may be introduced. volumetric flasks conforming to this International Standard should be used forpreciseanalyticalpurposes. CopyrightInternational Organizatin for Standardization ili ed without license from IHS Not for Resale