ISO INTERNATIONAL STANDARD 1773 Second edition 1997-04-01 ANsl Ineernat Doc Sec Laboratory glassware Narrow-necked boiling flasks Verrerie de laboratoire - Fioles coniques et ballons a col étroit ISO Reference number ISO 1773:1997(E) No reproduction or networking pemmited without license from IHS Not for Resale ISO1773:1997(E) Foreword iso(the International Organizationfor Standardization)is aworldwidefederationof national standardsbodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeer established has the right to be represented on that committee. International organizations, governmentai and non-governmental, in liaison with IsO, also take part in the work. so collaborates closely with the International Electrotechnical Commission (lEC)on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approvai by at least 75 % of the member bodies castingavote. This International Standard ISO 1773 has been prepared by Technical Committee ISO/TC 48, Laboratory glassware and related apparatus, Subcommittee Sc 2,General laboratory glassware (otherthan measuring apparatus) This second edition cancels and replaces the first edition (iSO 1773:1976) which has been technically revised and includes the following changes: - dimensions and tolerances have been brought up to date; - material and tests have been modified in accordance with iso 3585. Annex A of this International Standard is for information only. ISO1997 All rights reserved.Unless otherwise specified, nopart 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. InternationalOrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet [email protected] X.400 =ch;a=400net;p=iso;0=isocs;S=central PrintedinSwitzerland ISO 1773:1997(E) INTERNATIONALSTANDARD ISO Laboratory glassware - Narrow-necked boiling flasks Scope This International Standard specifies requirements and dimensions for an internationally acceptable series of conical flasks and of flat-bottom and round-bottom flasks for general laboratory purposes. The flasks are providedfor - direct use in a laboratory, fitting together with other equipment for general laboratory purposes; - further work up to other products. NOTE Annex A lists additional international Standards for other general-purpose laboratory glassware. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEc and Iso maintainregistersofcurrentlyvalidInternationalStandards. Iso3585:1991,Borosilicate glass 3.3—Properties. 3 Conicalflasks 3.1 Series of nominal capacity The series of nominal capacities of conical flasks is as follows (given in millilitres): 25-50-100-250-500-1000-2000-3000-5000 3.2 Nominal capacity The nominal capacity of a flask is the value, selected from the series given in 3.1, which is closest to but not larger than the actual volume to the base of neck. NOTE - The body dimensions recommended in table 1 take this requirement into account, and as far as possible are in accordancewiththecurrentproductionofflasks. 3.3Material Fiasks shall be made from borosilicate glass 3.3 in accordance with Iso 3585, and shall be free from visible defects and free from internal stress which would impair the performanc