1、BRITISH STANDARD BS 2734:1997 ISO 1773:1997 Specification for narrow-necked boiling flasks ICS 71.040.20BS2734:1997 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into
2、 effect on 15 August 1997 BSI 09-1999 ISBN 0 580 27852 2 National foreword This British Standard has been prepared by Technical Committee LBI/36 Laboratory glassware and related apparatus. It is identical with ISO1773:1997 Laboratory glassware Narrow-necked boiling flasks published by the Internatio
3、nal Organization for Standardization (ISO). The UK participation in its preparation was entrusted by Technical Committee LBI/36, Laboratory glassware and related apparatus, to Subcommittee LBI/36/2, General laboratory glass and plastic ware. It supersedes BS 2734:1984 which is withdrawn. A list of o
4、rganizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International
5、Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Stan
6、dard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amend
7、ments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS2734:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO 1773 1ii blankBS2734:1997 ii BSI 09-1999 Conten
8、ts Page Foreword iii 1 Scope 1 2 Normative reference 1 3 Conical flasks 1 4 Flat-bottom and round-bottom flasks 2 5 Marking 3 Annex A (informative) Bibliography 4 Table 1 Dimensions of conical flasks 2 Table 2 Dimensions of flat- and round-bottom flasks 3 Descriptors: Laboratory equipment, laborator
9、y glassware, flasks, conical flasks, specifications, dimensions, marking.BS2734:1997 BSI 09-1999 iii 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
10、 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 w
11、ork. ISO collaborates closely with the International Electrotechnical Commission (IEC) 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 requir
12、es approval by at least 75% of the member bodies casting a vote. This International Standard ISO1773 has been prepared by Technical Committee ISO/TC48, Laboratory glassware and related apparatus, Subcommittee SC2, General laboratory glassware (other than measuring apparatus). This second edition can
13、cels and replaces the first edition (ISO1773:1976) 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 ISO3585. Annex A of this International Standard is for informatio
14、n only.iv blankBS2734:1997 BSI 09-1999 1 1 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 provided for direct use in a labora
15、tory, fitting together with other equipment for general laboratory purposes; further work up to other products. NOTEAnnex A lists additional International Standards for other general-purpose laboratory glassware. 2 Normative reference The following standard contains provisions which, through referen
16、ce 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
17、 recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3585:1991, Borosilicate glass 3.3 Properties. 3 Conical flasks 3.1 Series of nominal capacity The series of nominal capacities of conical flasks is as follows (g
18、iven in millilitres): 25 50 100 250 500 1 000 2 000 3 000 5 000 3.2 Nominal capacity The nominal capacity of a flask is the value, selected from the series given in3.1, which is closest to but not larger than the actual volume to the base of neck. NOTEThe body dimensions recommended inTable 1 take t
19、his requirement into account, and as far as possible are in accordance with the current production of flasks. 3.3 Material Flasks shall be made from borosilicate glass3.3 in accordance with ISO3585, and shall be free from visible defects and free from internal stress which would impair the performan
20、ce of the flask. 3.4 Construction 3.4.1 Stability The flasks shall stand vertically without rocking or spinning when placed on a level surface. 3.4.2 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
21、 from the top. The top of the neck shall be suitably strengthened. 3.5 Dimensions 3.5.1 Recommended dimensions Dimensions for conical flasks are given inTable 1.BS2734:1997 2 BSI 09-1999 Table 1 Dimensions of conical flasks 3.5.2 Neck length The length of the neck shall be1to1,25times the external d
22、iameter of the neck. 3.5.3 Dimensions of base The radius at the junction between the base and the side of the flask shall be between15% and20% of the maximum external diameter. 3.5.4 Wall thickness Minimum values for the wall thickness are given inTable 1. Substantial local irregularities shall be a
23、voided. Manufacturers shall take care that minimum wall thicknesses are compatible with safety requirements. NOTEFlasks may also be manufactured with minimum wall thickness of 1,0mm for1 000ml flasks and of 1,1mm for2 000ml flasks. 4 Flat-bottom and round-bottom flasks 4.1 Series of nominal capaciti
24、es The series of nominal capacities of flat-bottom and round-bottom flasks is as follows (given in millilitres): 50 100 250 500 1 000 2 000 4 000 6 000 10 000 4.2 Nominal capacity The nominal capacity of a flask is the value, selected from the series given in4.1, which is closest to but not larger t
25、han the actual volume to the base of neck. NOTEThe body dimensions recommended inTable 2 take this requirement into account, and as far as possible are in accordance with the current production of flasks. 4.3 Material Flasks shall be made from borosilicate glass3.3 in accordance with ISO3585, and sh
26、all be free from visible defects and free from internal stress which would impair the performance of the flask. 4.4 Construction 4.4.1 Stability The flat-bottom flasks shall stand vertically without rocking or spinning when placed on a level surface. 4.4.2 Neck The neck of the flask shall be substan
27、tially 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 suitably strengthened. Dimensions in millimetres Nominal volume ml External diameter of body at widest point External diameter of neck Overall height
28、 Minimum wall thickness 25 42 1 22 1 75 3 0,8 50 51 1 22 1 90 3 0,8 100 64 1,5 22 1 105 3 0,8 250 85 2 34 1,5 145 3 0,9 500 105 2 34 1,5 180 4 0,9 1 000 131 3 42 2 220 4 1,3 2 000 166 3 50 2 280 4 1,5 3 000 187 3 50 2 310 5 1,8 5 000 220 3 50 2 365 5 1,8BS2734:1997 BSI 09-1999 3 4.5 Dimensions 4.5.1
29、 Recommended dimensions Dimensions for flat-bottom and round-bottom flasks are given inTable 2. 4.5.2 Dimensions of base The diameter of the base of flat-bottom flasks shall be approximately 50% of the maximum external diameter. Table 2 Dimensions of flat- and round-bottom flasks 4.5.3 Wall thicknes
30、s Minimum values for the wall thickness are given inTable 2. Substantial local irregularities shall be avoided. Manufacturers shall take care that minimum wall thicknesses are compatible with safety requirements. NOTEFlasks may also be manufactured with minimum wall thickness of 0,8mm for250ml and50
31、0ml flasks, and of 1,1mm for1 000ml flasks. 5 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. “100ml” (or “100”); b) the makers or vendors name or mark; c) each flask shall also b
32、ear 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. Dimensions in millimetres Nominal volume ml External diameter of body at widest point External diameter of neck Overall height Minimum wall thickness
33、flat bottom round bottom 50 51 1 26 1 90 2 95 2 0,8 100 64 1,5 26 1 105 2 110 2 0,8 250 85 2 34 1,5 138 2 143 2 0,9 500 105 2 34 1,5 163 2 168 2 0,9 1 000 131 3 42 2 190 3 200 3 1,3 2 000 166 3 50 2 230 3 240 3 1,5 4 000 207 3 50 2,5 275 3 290 3 1,8 6 000 236 3 65 3 315 3 330 3 1,8 10 000 279 4 65 3
34、 360 4 380 4 2,0BS2734:1997 4 BSI 09-1999 Annex A (informative) Bibliography 1 ISO 383:1976, Laboratory glassware Interchangeable conical ground joints. 2 ISO 384:1978, Laboratory glassware Principles of design and construction of volumetric glassware. 3 ISO 641:1975, Laboratory glassware Interchang
35、eable spherical ground joints. 4 ISO 3819:1985, Laboratory glassware Beakers. 5 ISO 4142:1997, Laboratory glassware Test tubes and culture tubes. 6 ISO 4785:1997, Laboratory glassware Straight-bore glass stopcocks for general purposes. 7 ISO 4796:1977, Laboratory glassware Bottles. 8 ISO 4797:1981,
36、Laboratory glassware Flasks with conical ground joints. 9 ISO 4799:1978, Laboratory glassware Condensers. 10 ISO 4800:1977, Laboratory glassware Separating funnels and dropping funnels. 11 ISO 6556:1981, Laboratory glassware Filter flasks.blankBS 2734:1997 ISO 1773:1997 BSI 389 Chiswick High Road Lo
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