BS-3674-1981.pdf
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1、BRITISH STANDARD BS 3674:1981 Specification for Sodium carbonate (technical grades) UDC 661.833.622:546.33264 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:28:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3674:1981 This British Standard, having been prepared under the direction of the
2、 Chemicals Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1981 BSI 11-1999 First published November 1963 First revision November 1981 The following BSI references relate to the work on this standard: Committee reference CIC/22 Draft fo
3、r comment 80/53293 DC ISBN 0 580 12419 3 Cooperating organizations The Chemicals Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Association of Fatty Acid Distillers British Tar Industry Association Chemical Industries As
4、sociation* Chemical Society, Analytical Division Consumer Standards Advisory Committee of BSI Department of Health and Social Security Department of Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Ministry of Agriculture, Fisheries and Food Ministry of Defen
5、ce* National Sulphuric Acid Association Paintmakers Association of Great Britain Ltd. Royal Institute of Public Health and Hygiene Soap and Detergent Industry Association* Standardization of Tar Products Tests Committee The organizations marked with an asterisk in the above list, together with the f
6、ollowing, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: British Man-made Fibres Association British Textile Employers Association Fabric Care Research Association Society of Glass Technology Amendments issued since publication Amd. No.D
7、ate of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:28:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3674:1981 BSI 11-1999i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope1 2References1 3Description1 4Sampling and size of sample1 5Material re
8、quirements1 6Packaging and marking1 Table 1 Material requirements2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:28:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3674:1981 ii BSI 11-1999 Foreword This British Standard, prepared under the direc
9、tion of the Chemicals Standards Committee, revises the 1963 edition, which is therefore withdrawn. Two specifications for sodium carbonate are given. One covers the hydrated product for use as a general household and industrial detergent, for which purposes it has the advantage over anhydrous sodium
10、 carbonate in that it dissolves easily in cold water; the other covers the anhydrous material which has a wide range of industrial applications, particularly in glass making and in the heavy chemicals industry. The standard has been revised in the light of current requirements and differs from the o
11、riginal publication in the following respects. a) The test methods are not appended to this revision but are published as Parts of BS 6070. In preparing BS 6070 the opportunity has been taken to implement those test methods prepared by Technical Committee 47, Chemistry, of the International Organiza
12、tion for Standardization (ISO) which have been prepared as a result of international collaboration in which the United Kingdom has participated. b) The units for the specification values have been altered, where necessary, to conform with the expression of results in the associated revised test meth
13、ods. 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 Standard does not of itself confer immunity from legal obligations. Summary of pages This document compr
14、ises 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 amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheff
15、ieldun sheffieldun, na, Wed Nov 29 07:28:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3674:1981 BSI 11-19991 1 Scope This British Standard specifies requirements for sodium carbonate decahydrate and anhydrous sodium carbonate of technical quality suitable for general industrial purposes. This st
16、andard does not apply to sodium carbonate for medical or pharmaceutical use or to a grade for photographic use. NOTEThese grades are covered by the British Pharmacopoeia and BS 3305 respectively. 2 References The titles of the publications referred to in this standard are listed on the inside back c
17、over. 3 Description 3.1 Sodium carbonate decahydrate. The material shall consist essentially of sodium carbonate decahydrate, Na2CO310H2O. It shall be in the form of almost colourless crystals which effloresce in dry air and shall be free from visible impurities. 3.2 Anhydrous sodium carbonate. The
18、material shall consist essentially of anhydrous sodium carbonate, Na2CO3. It shall be in the form of white powder or granules and shall be free from visible impurities. NOTEThe density of commercially available material may vary, e.g. the material known in the trade as “light ash” corresponds to a p
19、ouring density of about 0.5 g/ml whereas that known as “heavy ash” corresponds to one of about 1.0 g/ml. 4 Sampling and size of sample Sampling shall be in accordance with BS 6070-0. A sample size of 500 g is required for the purpose of examination in accordance with this specification. In the case
20、of the anhydrous material, a total sample of 2 kg is required if it is necessary to determine the pouring density. 5 Material requirements The material shall comply with the appropriate requirements of Table 1. Testing for compliance shall be carried out using the methods specified therein, with mod
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