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1、BRITISH STANDARD BS 2735:1956 Specification for Iodine flasks Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:39:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2735:1956 This British Standard, having been approved by the Scientific Glassware and Related Lab
2、oratory Apparatus Industry Standards Committee and endorsed by the Chairman of the Chemical Divisional Council, was published under the authority of the General Council on 26 March 1956 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference LBC/1 Draft for
3、comment CT(LBC) 4845 ISBN 0 580 35990 5 Co-operating organizations The Scientific Glassware and Related Laboratory Apparatus Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific
4、and industrial organizations: Admiralty* Air Ministry Association of British Chemical Manufacturers* Association of Scientific Workers Board of Trade British Association for the Advancement of Science* British Chemical Ware Manufacturers Association* British Laboratory Ware Association* British Lamp
5、blown Scientific Glassware Manufacturers Association* British Pharmacopia Commission British Scientific Instrument Research Association Chemical Society Department of the Government Chemist* D.S.I.R. Chemical Research Laboratory Glass Manufacturers Federation* Institute of Petroleum* Ministry of Edu
6、cation Ministry of Health* Ministry of Supply* National Physical Laboratory* Oil Companies Materials Committee Pharmaceutical Society of Great Britain Royal Institute of Chemistry* Science Masters Association Society for Analytical Chemistry* Society of Chemical Industry Society of Glass Technology*
7、 Standardization of Tar Products Tests Committee* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Associa
8、tion of Hospital Management Committees Guild of Public Pharmacists High Commission of India Metropolitan Water Board University of London (Faculty of Science) Individual Manufacturers Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South B
9、ank University, Tue Dec 12 08:39:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2735:1956 BSI 12-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Sizes1 3Material1 4Construction and dimensions1 5Markings1 Figure 1 Iodine flask2 Licensed Copy: London South Bank U
10、niversity, London South Bank University, Tue Dec 12 08:39:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2735:1956 ii BSI 12-1999 Foreword This standard makes reference to the following British Standard: BS 572, Interchangeable conical ground glass joints. This British Standard, which has been pre
11、pared under the authority of the Scientific Glassware and Related Laboratory Apparatus Industry Standards Committee, provides a specification for iodine flasks such as are employed in analytical laboratories for the determination of iodine values. The important points for this purpose are the capaci
12、ty of the cup top and the design of the long-handled stopper. The cup top specified is wider than has been commonly provided in the past, and thus has the following advantages: a) It is easier to pour from a bottle into the cup with the stopper in position. b) It is easier to clear the tap of a bure
13、tte or the vapour tube of a Soxhlet extractor. c) It is easier to extract the stopper without breaking the rim of the cup. 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 w
14、ith 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, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had
15、amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:39:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2735:1956 BSI 12-19991 1 Scope This British Standard specifie
16、s suitable flasks with stoppers for use in the determination of iodine values. 2 Sizes Two sizes of flask are specified, of nominal capacity 250 and 500 ml. 3 Material The flasks and stoppers shall be made of borosilicate glass, as free as possible from visible defects, and shall be reasonably free
17、from internal strain. 4 Construction and dimensions The flasks shall be of conical form and shall be provided with a cup top, such that when the stopper is in position it shall have a capacity of not less than 20 ml. Suitable dimensions of the two sizes of flask and of the cup top are shown in Figur
18、e 1. A minimum wall thickness of 1.5 mm in any part is recommended. The stopper shall be hollow blown and closed at the lower end. Suitable dimensions are shown in Figure 1. The ground surfaces of the flasks and stoppers shall comply with the relevant requirements of BS 5721) for joint size B.24. 5
19、Markings Each flask shall have permanently and legibly marked on it: a) The nominal capacity, i.e. “250 ml” or “500 ml”. b) The makers or vendors name or mark. c) An area (about 15 mm diameter) with a surface suitable for marking with pencil. d) The number of this British Standard, i.e. “BS 2375”.2)
20、 1) BS 572, “Interchangeable conical ground glass joints”. 2) The mark “BS 2735” on the product is an indication by the manufacturer that it purports to comply with the requirements of this British Standard. The British Standards Institution is the owner of the registered certification mark shown be
21、low: which can be used by manufacturers only under licence from the BSI. The presence of this mark in addition to the mark “BS 2735” on a product is an assurance that the product does comply with the requirements of the standard. It indicates that the BSI has satisfied itself, by inspection and test
22、ing, that the system of production, supervision and control used by the manufacturer is such as to ensure compliance with all the requirements of the standard. Maintenance of this approved system is secured by periodical inspection and testing on behalf of the BSI. The mark must be accompanied by th
23、e name or registered trade mark or licence number of the licensed manufacturer. Further particulars of the terms of licence may be obtained from the Director, British Standards Institution, 2 Park Street, London, W.1. Licensed Copy: London South Bank University, London South Bank University, Tue Dec
24、 12 08:39:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2735:1956 2 BSI 12-1999 All linear dimensions are in millimetres Figure 1 Iodine flask Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:39:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2735:1956 BSI
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37、ndard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:39:05 GMT+00:00 2006, Uncontrolled Copy, (c) BSI