1、BRITISH STANDARD BS3984:1982 Specification for Sodium silicates UDC 661.833.65:546.33284BS3984:1982 This BritishStandard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comesintoeffect on 26February1982 BSI 12-19
2、99 First published February1966 First revision February1982 The following BSI references relate to the work on this standard: Committee reference CIC/22 Draft for comment 80/53295 DC ISBN 0 580 12421 5 Cooperating organizations The Chemicals Standards Committee, under whose direction this BritishSta
3、ndard was prepared, consists of representatives from the following: Association of Fatty Acid Distillers British Tar Industry Association Chemical Industries Association* Chemical Society, Analytical Division Consumer Standards Advisory Committee of BSI Department of Health and Social Security Depar
4、tment of Industry (Laboratory of the Government Chemist) Fertiliser Manufacturers Association Ltd. Ministry of Agriculture, Fisheries and Food Ministry of Defence* National Sulphuric Acid Association Paintmakers Association of Great Britain Ltd. Royal Institute of Public Health and Hygiene Soap and
5、Detergent Industry Association* Standardization of Tar Products Tests Committee The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this BritishStandard: British Man-made Fibr
6、es Federation British Textile Employers Association Fabric Care Research Association Society of Glass Technology Amendments issued since publication Amd. No. Date of issue CommentsBS3984:1982 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii Section 1. General 1 Sc
7、ope 1 2 References 1 Section 2. Sodium metasilicate pentahydrate (n) 3 Description 1 4 Sampling and size of sample 1 5 Material requirements 1 6 Packaging and marking 1 Section 3. Sodium metasilicate pentahydrate (s) 7 Special requirements 1 Section 4. Sodium silicate solutions 8 Sampling and size o
8、f sample 2 9 Classification 2 10 Properties to be specified 2 11 Compliance with the standard 2 12 Packaging and marking 2 Appendix A Calculation of metasilicate content of sodium metasilicatepentahydrate (n) 3 Table 1 Sodium metasilicate pentahydrate (n): material requirements 1 Table 2 Sodium meta
9、silicate pentahydrate (s): special requirements 2 Publications referred to Inside back coverBS3984:1982 ii BSI 12-1999 Foreword This BritishStandard, prepared under the direction of the Chemicals Standards Committee, revises the1966 edition which is therefore withdrawn. Two specifications are given
10、for sodium metasilicate pentahydrate. One covers a product suitable for general industrial use and is designated as sodium metasilicate pentahydrate (n); the other includes additional requirements for material of selected quality in respect of chloride and sulphate contents, suitable for British Gov
11、ernment Services use, and is designated as sodium metasilicate pentahydrate (s) 1) . A specification of a more general nature is given for sodium silicate solutions which takes into account variability of composition. Sodium silicate glass is manufactured by fusing together sand and sodium carbonate
12、. Its chemical composition is not fixed but can vary according to the proportions of silica and alkali used. In consequence, the sodium silicate solutions made by dissolving the glass can vary both in chemical composition and in concentration, so that the number of different solutions which could be
13、 made and which would come within the general scope of this specification is very large. For this reason no attempt is made to specify individually the composition of the many grades of solution at present available but methods of classifying such solutions by the ratio of the mass of SiO 2to the ma
14、ss of Na 2 O, and by the density are specified instead. The standard has been revised in the light of current requirements and differs from the1966 edition in the following respects. a) The test methods are not appended to this revision but are published as Parts of BS6092. In preparing BS6092, the
15、opportunity has been taken to implement those test methods prepared by Technical Committee47, Chemistry, of the International Organization 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
16、specification values have been altered, where necessary, to conform with the expression of results in the associated revised test methods. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicati
17、on. 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, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and ma
18、y have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Any questions relating to the supply of sodium metasilicate pentahydrate (s) for British Government Service should be addressed to the Ministry of Defence, Directorate of Standardization,
19、First Avenue House, High Holborn, London, WC1.BS3984:1982 BSI 12-1999 1 Section 1. General 1 Scope This BritishStandard specifies requirements for the following materials of technical quality. a) Sodium metasilicate pentahydrate (n) suitable for general industrial use b) Sodium metasilicate pentahyd
20、rate (s) of selected quality, in respect of chloride and sulphate contents, which will meet British Government Services requirements. c) Sodium silicate solutions suitable for general industrial use. The last specification comprises a method of classification for sodium silicate solutions, together
21、with the permitted tolerances on the properties specified when ordering. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. Section 2. Sodium metasilicate pentahydrate (n) 3 Description The material shall be in the form of colourless, free-f
22、lowing crystals and shall consist essentially of sodium metasilicate pentahydrate (Na 2 SiO 3 5H 2 O). NOTEThe metasilicate content may be calculated by the method described in Appendix A of this standard. 4 Sampling and size of sample Sampling shall be in accordance with BS6092-0. A sample of not l
23、ess than500g is required for the purpose of examination in accordance with this specification. 5 Material requirements The material shall comply with the requirements of Table 1. Testing for compliance shall be carried out using the test methods specified therein, with modifications, as shown in the
24、 right-hand column of the table. 6 Packaging and marking The material shall be supplied in sound, clean and dry, moisture-resistant packages. Identification and marking shall be in accordance with current legislation. Section 3. Sodium metasilicate pentahydrate (s) 7 Special requirements This sectio
25、n details those special requirements, which will meet British Government Services requirements, that are not covered in section2. This specification is the same as that for sodium metasilicate pentahydrate (n) (section2) in all respects except that the material shall also comply with the special req
26、uirements of Table 2 when tested by the test methods specified in the right-hand column of the table. Table 1 Sodium metasilicate pentahydrate (n): material requirements Property max. min. Test method BS6092:Part: Particular requirements in carrying out the determination Total alkali content, as Na
27、2 O% by mass 30.0 28.5 5 Take50.0ml of the test solution (see6.2ofPart5:1981) for the titration Silica content, as SiO 2 % by mass 29.2 27.3 7 Take as test portion about7g of the laboratory sample weighed to the nearest0.1mg Matter insoluble in water% by mass 0.2 Not specified 10 Iron content, as Fe
28、mg/kg 500 Not specified 9 1. Take as test portion about8.5g of the laboratory sample, weighed to the nearest0.01g 2. Take10.0ml of the test solution(6.4.1) for colour development (see6.4.2 of Part9:1981)BS3984:1982 2 BSI 12-1999 Table 2 Sodium metasilicate pentahydrate (s): special requirements Sect
29、ion 4. Sodium silicate solutions 8 Sampling and size of sample Sampling shall be in accordance with BS6092-0. A sample of not less than500ml is required for the purpose of examination in accordance with this specification. 9 Classification The composition of sodium silicate solutions shall be classi
30、fied by the ratio of the mass of SiO 2to the mass of Na 2 O, and the concentration shall be classified by the density. NOTEThe sodium silicate solutions available commercially vary from the more alkaline materials of ratio about1.5, with concentrations ranging up to55% solids (density about1.75g/ml)
31、, to the highly siliceous materials of ratio about4.0, with concentrations ranging up to25% solids (density about1.25g/ml). 10 Properties to be specified The purchaser shall specify the following properties of the sodium silicate solution: a) the ratio of the mass of SiO 2to the mass of Na 2 O; b) t
32、he density at20 C. NOTEBy agreement between the purchaser and the supplier, an upper and lower limit for viscosity, determined by the method described in section3 of BS188:1977, may also be specified. 11 Compliance with the standard The sodium silicate solution supplied shall be deemed to comply wit
33、h the requirements of this standard if its composition and concentration are within the following limits of those properties specified in clause10: a) Ratio. The ratio of the mass of SiO 2to the mass of Na 2 O, calculated from values obtained using the methods specified in BS6092-7 and BS6092-5 resp
34、ectively, shall lie within 0.05 of the ratio specified by the purchaser. If the viscosity is specified, the tolerances for the ratio may be increased and shall be subject to agreement between the purchaser and the supplier. b) Density. The density at20 C shall lie within 0.01 of the figure specified
35、 by the purchaser when determined by the method specified in BS6092-1. If the viscosity is specified, the tolerances may be increased and shall be subject to agreement between purchaser and supplier. c) Purity. The combined mass of SiO 2and Na 2 O shall be not less than97.5% of the total mass of sol
36、ids present, determined by the method specified in BS6092-2. 12 Packaging and marking The material shall be supplied in sound, clean packages. NOTEAttention is drawn to the need to comply with current legislation with reference to identification and marking. Property % by mass, max. Test method BS60
37、92:Part: Chloride, as NaCl Sulphate, as Na 2 SO 4 0.25 0.21 11 12BS3984:1982 BSI 12-1999 3 Appendix A Calculation of metasilicate content of sodium metasilicate pentahydrate (n) The metasilicate content, expressed as a percentage by mass of sodium silicate pentahydrate (Na 2 SiO 3 5H 2 O), is given
38、by the formula: 3.53 Y (if the ratio Y : Z is less than0.969) or 3.42 Z (if the ratio Y : Z is greater than0.969) where Y is the percentage by mass of silica, SiO 2 , determined by the test method specified in BS6092-7; Z is the percentage by mass of total alkali, calculated as sodium oxide, Na 2 O,
39、 determined by the method specified in BS6092-5.4 blankBS3984:1982 BSI 12-1999 Publications referred to BS 188, Methods for determination of the viscosity of liquids. BS 6092, Methods of sampling and test for sodium and potassium silicates for industrial use. BS 6092-0, General introduction. BS 6092
40、-1, Determination of solution density at20 C. BS 6092-2, Determination of total solids content. BS 6092-5, Determination of total alkali content. BS 6092-7, Determination of silica content (titrimetric method). BS 6092-9, Determination of iron content. BS 6092-10, Determination of matter insoluble i
41、n water. BS 6092-11, Determination of chloride content of sodium metasilicate. BS 6092-12, Limit test for sulphate content of sodium metasilicate. BS3984:1982 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing Britis
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