1、BRITISH STANDARD BS ISO 4798:1997 Laboratory glassware Filterfunnels ICS 71.040.20BSISO4798:1997 This British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 August 199
2、7 BSI 09-1999 ISBN 0 580 28080 2 National foreword This British Standard reproduces verbatim ISO4798:1997 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee LBI/36, Laboratory glassware and related apparatus, to Subcommittee LB
3、I/36/2, General laboratory glass and plastics ware, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related int
4、ernational and European developments and promulgate them in the UK. A list of organizations 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
5、found in the BSI Standards Catalogue under the section entitled “International 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 Standard
6、s are responsible for their correct application. Compliance with a British Standard 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, theISO title page, pages ii to iv, pages 1 to 4 and a back cov
7、er. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO4798:1997 BSI 09-1999 i Contents Page National foreword Inside fro
8、nt cover Foreword iii Text of ISO 4798 1ii blankBSISO4798:1997 ii BSI 09-1999 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Types and sizes 1 4 Material 1 5 Construction 1 6 Dimensions 2 7 Marking 3 Annex A (informative) Bibliography 4 Figure 1 General design of glass filter funnel
9、 (plain or analytical) 2 Table 1 Dimensions for plain filter funnels 2 Table 2 Dimensions for analytical filter funnels 3 Descriptors: Laboratory equipment, laboratory glassware, funnels, specifications, dimensions, marking.BSISO4798:1997 BSI 09-1999 iii Foreword ISO (the International Organization
10、for Standardization) is 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 t
11、he 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 (IEC) on all matters of electrotechnical standardization. Draft I
12、nternational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. This International Standard ISO 4798 has been prepared by Technical Committee ISO/
13、TC48, Laboratory glassware and related apparatus, Subcommittee SC2, General laboratory glassware (other than measuring apparatus). Annex A of this International Standard is for information only.iv blankBSISO4798:1997 BSI 09-1999 1 1 Scope This International Standard specifies requirements and dimens
14、ions for glass filter funnels suitable for general laboratory purposes, fitting together with other general-use glassware such as boiling flasks and volumetric flasks. NOTEAnnex A lists additional International Standards for other general-purpose laboratory glassware. 2 Normative references The foll
15、owing standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are enc
16、ouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 719:1985, Glass Hydrolytic resistance of glass grains at98 C Method of test and classification. ISO
17、3585:1991, Borosilicate glass3.3 Properties. 3 Types and sizes Two types of filter funnels are specified, in sizes as follows (given in millimetres): 3.1 Plain filter funnels of bowl diameter: 355575100125150200 3.2 Analytical filter funnels of bowl diameter: 55 75100 4 Material 4.1 When tested in a
18、ccordance with the procedure and classification given in ISO719, the glass shall comply with the requirements of class HGB3 or better. The glass shall be free from visible defects and shall be free from internal stress which would impair the performance of the filter funnels. 4.2 At the manufacturer
19、s discretion, filter funnels may be manufactured from borosilicate glass3.3in accordance with ISO3585. 5 Construction 5.1 General appearance The funnel shall consist of a bowl, having the shape of a right circular cone, and a stem which shall be coaxial with the bowl. 5.2 Bowl 5.2.1 The wall of the
20、bowl shall diverge form the axis of the funnel so as to give an included 0 angle of. 5.2.2 In plain filter funnels, the bowl shall be plain or with a beaded rim. 5.2.3 In analytical funnels, the bowl shall either be plain or ribbed internally or externally. Where the bowl is ribbed externally, there
21、 shall be at least three such ribs evenly spaced round the bowl. 5.3 Rim The rim of the bowl shall be fire-polished, beaded or ground to a plane surface with the outside slightly bevelled. Any rim bead should not project internally so as to interfere with the lie of the filter paper. 5.4 Stem 5.4.1
22、In plain filter funnels, the stem should consist of a separate piece of tubing joined neatly and securely to the bowl, or be drawn out from the bowl. The stem may be slightly tapered from the upper to the lower end. 5.4.2 In analytical filter funnels, the stem shall consist of a separate piece of tu
23、bing joined neatly and securely to the bowl. 60 0 3 BSISO4798:1997 2 BSI 09-1999 5.4.3 The end of the stem shall be ground at30 minimum to the axis, and the outer edge of the ground part shall be slightly bevelled or fire-polished. 6 Dimensions The dimensions of the filter funnels shall be as shown
24、inTable 1 andTable 2. Table 1 Dimensions for plain filter funnels Figure 1 General design of glass filter funnel (plain or analytical) Dimensions in millimetres Bowl Stem Internal diameter Wall thickness Nominal Wall thickness min. External diameter Length min. 35 5 1 6 35 0,8 55 5 1 8 55 1,3 75 5 1
25、 8 75 1,3 100 5 1,2 10 100 1,3 125 5 1,2 16 125 1,3 150 10 1,2 16 150 1,6 200 10 1,5 24 150 1,6BSISO4798:1997 BSI 09-1999 3 Table 2 Dimensions for analytical filter funnels 7 Marking The following inscriptions shall be marked on each filter funnel: the manufacturers and/or suppliers name or mark; th
26、e type of glass, if not otherwise identifiable. The following are optional: the internal diameter of the bowl without tolerances; the number of this International Standard. Dimensions in millimetres Bowl Stem Internal diameter Diameter Wall thickness Length external internal 5 max. min. min 5 55 9,4
27、 2,5 1,5 150 75 100BSISO4798:1997 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 Inte
28、rchangeable spherical ground joints. 4 ISO 1773:1997, Laboratory glassware Narrow-necked boiling flasks. 5 ISO 3819:1985, Laboratory glassware Beakers. 6 ISO 4142:1997, Laboratory glassware Test tubes and culture tubes. 7 ISO 4785:1997, Laboratory glassware General-purpose glass stopcocks. 8 ISO 479
29、6:1977, Laboratory glassware Bottles. 9 ISO 4797:1981, Laboratory glassware Flasks with conical ground joints. 10 ISO 4799:1978, Laboratory glassware Condensers. 11 ISO 4800:1977, Laboratory glassware Separating funnels and dropping funnels. 12 ISO 6556:1981, Laboratory glassware Filter flasks.5 bla
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