1、BRITISH STANDARDBS EN ISO 24450:2005Laboratory glassware Wide-necked boiling flasksThe European Standard EN ISO 24450:2005 has the status of a British StandardICS 71.040.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51
2、g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 24450:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23 January 2006 BSI 23 January 2006ISBN 0 580 47137 3National forewordThis British Standard is the off
3、icial English language version of EN ISO 24450:2005. It is identical with ISO 24450:2005.The UK participation in its preparation was entrusted by Technical Committee LBI/36, Laboratory glassware and related accessories, to Subcommittee LBI/36/1, General and volumetric glass, which has the responsibi
4、lity to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “Intern
5、ational Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Brit
6、ish Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and Eu
7、ropean developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 4, an inside back cover and a back cover.The BSI copyright notice displayed
8、in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 24450November 2005ICS 71.040.20English VersionLaboratory glassware - Wide-necked boiling flasks (ISO24450:2005)Verrerie de labor
9、atoire - Fioles coniques et ballons collarge (ISO 24450:2005)Laborgerte aus Glas - Erlenmeyer-, Rund- undStehkolben, weithalsig (ISO 24450:2005)This European Standard was approved by CEN on 28 October 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
10、conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in thre
11、e official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austri
12、a, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIO
13、NCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 24450:2005: EEN ISO 24450:2005Foreword This document (EN ISO
14、 24450:2005) has been prepared by Technical Committee ISO/TC 48 “Laboratory glassware and related apparatus“ in collaboration with Technical Committee CEN/TC 332 “Laboratory equipment“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard,
15、either by publication of an identical text or by endorsement, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to im
16、plement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingd
17、om. Endorsement notice The text of ISO 24450:2005 has been approved by CEN as EN ISO 24450:2005 without any modifications. Reference numberISO 24450:2005(E)INTERNATIONAL STANDARD ISO24450First edition2005-11-01Laboratory glassware Wide-necked boiling flasks Verrerie de laboratoire Fioles coniques et
18、 ballons col large EN ISO 24450:2005ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Series and capacities . 1 4 Material 2 5 Construction and dimensions . 2 6 Marking 3 Bibliography . 4 EN ISO 24450:2005iv Foreword ISO (the International Organization for Standardization) is
19、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 represent
20、ed 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. International Standards are dra
21、fted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International St
22、andard requires approval by at least 75 % of the member bodies casting a vote. 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. ISO 24450 was prepared
23、 by Technical Committee ISO/TC 48, Laboratory glassware and related apparatus, Subcommittee SC 6, Laboratory and volumetric ware. EN ISO 24450:20051Laboratory glassware Wide-necked boiling flasks 1 Scope This International Standard specifies requirements and dimensions for an internationally accepta
24、ble series of conical flasks and of flat-bottom and round-bottom flasks with wide neck for general laboratory purpose. The flasks are provided for direct use in laboratory, fitting together with other equipment for general laboratory purposes; further work up to other products. NOTE For narrow-necke
25、d boiling flasks, ISO 1773 applies. For boiling flasks with conical ground joints, see ISO 4797. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest
26、edition of the referenced document (including any amendments) applies. ISO 3585, Borosilicate glass 3.3 Properties 3 Series and capacities 3.1 Series of nominal capacity The series of nominal capacities of wide-necked conical flasks is as follows (given in millilitres): 50 100 250 500 1 000 The seri
27、es of nominal capacities of wide-necked round-bottom flasks is as follows (given in millilitres): 50 100 250 500 1 000 2 000 4 000 6 000 10 000 The series of nominal capacities of wide-necked flat-bottom flasks is as follows (given in millilitres): 50 100 250 500 1 000 2 000 3.2 Nominal capacity The
28、 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 Tables 1 and 2 take this requirement into account. EN ISO 24450:20052 4 Material Flasks shall be ma
29、de from borosilicate glass 3.3 in accordance with ISO 3585, and shall be free from visible defects which might affect performance, and free from any internal stress which would impair the performance of the flask. 5 Construction and dimensions 5.1 Construction 5.1.1 Stability Conical flasks and flat
30、-bottom flasks shall stand vertically without rocking or spinning when placed on a level surface. 5.1.2 Neck The neck of the flask shall be substantially circular in cross-section and the mouth of the neck shall not be belled to any considerable distance from the top. The top of the neck shall be su
31、itably strengthened. 5.2 Dimensions 5.2.1 Recommended dimensions Dimensions for wide-necked conical flasks are given in Table 1. Table 1 Dimensions of wide-necked conical flasks Dimensions in millimetres Nominal volume Wall thickness ml External diameter of body at widest point External diameter of
32、neck Overall height min. max. 50 51 1 34 1,5 85 3 0,8 2,5 100 64 1,5 34 1,5 105 3 0,8 2,5 250 85 2 50 2 140 3 0,9 3,3 500 105 2 50 2 175 4 0,9 3,3 1 000 131 3 50 2 220 4 1,3 3,6 EN ISO 24450:20053Dimensions of wide-necked flat-bottom and round-bottom flasks are given in Table 2. Table 2 Dimensions o
33、f wide-necked flat- and round-bottom flasks Dimensions in millimetres Nominal volume Overall height Wall thickness ml External diameter of body at widest point External diameter of neck flat bottom round bottom min. max. 50 51 1 34 1,5 90 2 95 2 0,8 2,5 100 64 1,5 34 1,5 105 2 110 2 0,8 2,5 250 85 2
34、 50 2 138 2 143 2 0,9 3,3 500 105 2 50 2 163 2 168 2 0,9 3,3 1 000 131 3 50 2 190 3 200 3 1,3 3,6 2 000 166 3 76 2 230 3 240 3 1,5 4,0 4 000 207 3 76 2 290 3 1,8 5,0 6 000 236 3 89 3 330 3 1,8 5,5 10 000 279 4 89 3 380 4 2,0 5,5 5.2.2 Neck length The length of the neck of conical flasks shall be 1 t
35、o 1,25 times the external diameter of the neck. 5.2.3 Dimensions of base The radius at the junction between the base and the side of conical flasks shall be between 15 % and 20 % of the maximum external diameter. The diameter of the base of flat-bottom flasks shall be approximately 50 % of the maxim
36、um external diameter. 5.2.4 Wall thickness Values for the wall thickness are given in Tables 1 and 2. Substantial local irregularities shall be avoided. Manufacturers shall take care that minimum wall thicknesses are compatible with safety requirements. 5.3 Graduation Wide-necked conical flasks may
37、be provided with a scale approximately indicating the volume of liquid contained. 6 Marking The following inscriptions shall be permanently and legibly marked on all conical, flat-bottom and round-bottom flasks: a) the nominal volume of the flask, e.g. “100 ml”; b) the makers and/or vendors name and
38、/or mark; c) each flask shall also bear an area with a surface suitable for marking with a pencil. It is recommended that reference is made on each flask to this International Standard, e.g. by the inscription “ISO 24450”. EN ISO 24450:20054 Bibliography 1 ISO 1773, Laboratory glassware Narrow-necke
39、d boiling flasks 2 ISO 4797, Laboratory glassware Boiling flasks with conical ground joints EN ISO 24450:2005blankBS EN ISO 24450:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents th
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