1、BRITISH STANDARD BS 1912:1990 Specification for Soap flakesBS1912:1990 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Board of BSI andcomes into effect on 31October1990 BSI 11-1999 First published Feb
2、ruary1953 Second edition October1973 Third edition June1985 Fourth edition October1990 The following BSI references relate to the work on this standard: Committee reference CIC/34 Draft for comment89/55505 DC ISBN 0 580 18720 9 Committees responsible for this British Standard The preparation of this
3、 British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/34, upon which the following bodies were represented: Chemical Industries Association Chemical Industries Association (GOSIP) Consumer Policy Committee of BSI Department of Trade and Indust
4、ry (Laboratory of the Government Chemist) Ministry of Defence Royal Society of Chemistry Soap and Detergent Industry Association Society of Dyers and Colourists Amendments issued since publication Amd. No. Date CommentsBS1912:1990 BSI 11-1999 i Contents Page Committees responsible Inside front cover
5、 Foreword ii 1 Scope 1 2 Properties 1 Appendix A Measurement of thickness of soap flakes 2 Appendix B Determination of total free alkali content 2 Appendix C Determination of free caustic alkali content 2 Table 1 Properties and test methods 1 Publications referred to Inside back coverBS1912:1990 ii
6、BSI 11-1999 Foreword This revision of BS1912 has been prepared under the direction of the Chemicals Standards Policy Committee. It supersedes the1985 edition of BS1912, which is withdrawn and from which it differs principally in that the references to test methods have been changed to take account o
7、f the partial revision of BS1715:1963, and that the requirement for rosin acids content has been deleted. This British Standard is one of a series dealing with various kinds of soap. Other standards in the series are as follows: BS 1545, Specification for liquid toilet soap. BS 1911, Specification f
8、or hard soap. BS 1913, Specification for soft soap. BS 1914, Specification for toilet soap. BS 4405, Specification for liquid soap. Soap flakes represent soap in a form that facilitates the quick preparation of a washing solution; they are characterized by their flake form, high soap content and rea
9、dy solubility in water. 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
10、This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, 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.BS1912
11、:1990 BSI 11-1999 1 1 Scope This British Standard specifies requirements and gives corresponding test methods for soap flakes for domestic purposes. CAUTION. Soap flakes complying with this standard may be unsuitable for washing fabrics with a flame retardant finish, especially in hard water areas.
12、A suitable warning should be given on soap flakes in retail size packs. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Properties 2.1 The content of the soap flakes shall be as given in Table 1. Compliance shall be checked by the methods given
13、in Table 1 using analysis samples prepared as described in BS1715-1. 2.2 In the case of the properties listed in items2 to6 of Table 1, the actual results obtained by the specified methods of test shall be recalculated in relation to the specified minimum total fatty matter content (see Table 1, ite
14、m1) by means of the following equation: Recalculated result = NOTERecalculation of the results is necessary because soap flakes are liable to lose moisture on keeping. 2.3 When measured in accordance with Appendix A, the average thickness of the soap flakes shall not be greater than0.20mm. Table 1 P
15、roperties and test methods Actual result Specified minimum total fatty matter content Actual total fatty matter content - Property Content Test method 1. Total fatty matter content min. 2. Unsaponified saponifiable matter content max. 3. Ethanol-insoluble matter content max. 4. Total free alkali con
16、tent (Na 2 O) max. 5. Free caustic alkali content (Na 2 O) max. 6. Chloride content (NaCl) max. %(m/m) 80 0.25 2.0 0.3 0.05 1.0 Described in BS1715-2.1 Described in BS1715-2.5 Described in BS1715-2.11 Described in BS1715-2.2 and Appendix B of this standard Described in BS1715-2.3 and Appendix C of t
17、his standard Described in BS1715-2.7BS1912:1990 2 BSI 11-1999 Appendix A Measurement of thickness of soap flakes A.1 Sampling The sample of flakes of which the thickness is to be estimated shall be handled as lightly as possible in order to avoid breakage of flakes with deposition of soap particles
18、on the surface of the whole flakes. A.2 Measuring instrument The instrument used shall be a micrometer gauge complying with BS870 but, in order to accommodate small flakes the diameter of the travelling face should be reduced to3.0mm. A.3 Procedure Pour a portion of the sample to be tested on to a s
19、heet of paper in such a way that a thin layer is made to cover a fairly large area. Select a flake and carefully trim off the edges with a razor blade in order to remove any edge irregularities. Check the zero reading of the gauge, open it approximately3mm, support it in a vertical position and tran
20、sfer the trimmed flake to the lower fixed face of the gauge by means of a spatula or knife. Make sure the flake is as centrally placed as possible and then, by means of the milled ratchet-head, rotate the moving arm of the gauge until the flake is just gripped between the two faces. Turn the gauge i
21、nto a horizontal position, give the ratchet-head approximately two complete rotations and read the thickness of the flake on the graduated collar of the gauge. Measure the thickness of20 flakes, chosen at random from different parts of the layer on the paper, note the thickness of each flake and rec
22、ord the arithmetical average thickness found. Appendix B Determination of total free alkali content Use the method described in BS1715-2.2 except that the calculation and formulae given in9.1 of BS1715-2.2:1989 should be replaced by the following. The total free alkali content, expressed as a percen
23、tage by mass of Na 2 O, is given by the formula: Appendix C Determination of free caustic alkali content Use method A described in BS1715-2.3, except that the calculation and formula given in4.5.1 of BS1715-2.3:1989 should be replaced by the following. The free caustic alkali content, expressed as a
24、 percentage by mass of Na 2 O, is given by the formula: where m is the mass of the test portion (ing); V 0 is the volume of the sulphuric acid solution (see5.2 of BS1715-2.2:1989) used in the determination (inmL); 0.031 V 0 T 0 V 1 T 1 m - 100 V 1 is the volume of the potassium hydroxide solution (s
25、ee5.3 of BS1715-2.2:1989) used in the titration (inmL); T 0 is the exact amount-of-substance concentration of the sulphuric acid solution (see5.2 of BS1715-2.2:1989) (inmol/L); T 1 is the exact amount-of-substance concentration of the potassium hydroxide solution (see5.3 of BS1715-2.2:1989) used in
26、the titration (inmol/L). where m is the mass of the test portion (ing); V is the volume of the ethanolic hydrochloric acid solution (see4.2.3 of BS1715-2.3:1989) used (inmL); T is the amount-of-substance concentration of the ethanolic hydrochloric acid solution (see4.2.3 of BS1715-2.3:1989) used (in
27、mol/L). 0.031 VT m - 100 BS1912:1990 BSI 11-1999 Publications referred to BS 870, Specification for external micrometers. BS 1545, Specification for liquid toilet soap 1) . BS 1715, Analysis of soaps. BS 1715-1, General introduction, sampling, and test for presence of synthetic anionic-active surfac
28、e active agents. BS 1715-2.1, Method for determination of total alkali content and total fatty matter content. BS 1715-2.2, Method for determination of total free alkali content. BS 1715-2.3, Methods for determination of free caustic alkali content. BS 1715-2.5, Method for determination of unsaponif
29、iable, unsaponified and unsaponified saponifiable matter contents. BS 1715-2.7, Method for determination of chloride content. BS 1715-2.11, Method for determination of ethanol-insoluble matter content. BS 1911, Specification for hard soap 1) . BS 1913, Specification for soft soap 1) . BS 1914, Speci
30、fication for toilet soap 1) . BS 4405, Specification for liquid soap 1) . 1) Referred to in the foreword only.BS 1912:1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view
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