1、BRITISH STANDARD BS 1911:1990 Specification for Hard soapBS1911:1990 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under theauthorityof the Board ofBSIandcomes into effect on 31 October 1990 BSI 09-1999 First published Februa
2、ry 1953 Second edition July 1966 Third editionJuly 1985 Fourth edition October 1990 The following BSI references relate to the work on this standard: Committee reference CIC/34 Draft for comment 89/55504 DC ISBN 0 580 18725 X Committees responsible for this British Standard The preparation of this B
3、ritish 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 Industry
4、 (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 CommentsBS1911:1990 BSI 09-1999 i Contents Page Committees responsible Inside front cover F
5、oreword ii 1 Scope 1 2 Properties 1 Appendix A Determination of total free alkali content 2 Appendix B Determination of free caustic alkali content 2 Table 1 Properties and test methods 1 Publications referred to Inside back coverBS1911:1990 ii BSI 09-1999 Foreword This revision of BS 1911 has been
6、prepared under the direction of the Chemicals Standards Policy Committee. It supersedes the 1985 edition of BS 1911, which is withdrawn and from which it differs principally in that the references to test methods have been changed to take account of the partial revision of BS 1715:1963, and that the
7、 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 1912, Specification for soap flakes. BS 1913, Specification for soft soa
8、p. BS 1914, Specification for toilet soap. BS 4405, Specification for liquid soap. 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 itsel
9、f confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 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 ind
10、icated in the amendment table on the inside front cover.BS1911:1990 BSI 09-1999 1 1 Scope This British Standard specifies requirements and gives corresponding test methods for hard soap for domestic purposes, such as is supplied in tablets or bars to the general public. NOTEThe titles of the publica
11、tions referred to in this standard are listed on the inside back cover. 2 Properties 2.1 The content of hard soap shall be as given in Table 1. Compliance shall be checked by the methods given inTable 1using analysis samples prepared as described in BS 1715-1. 2.2 In the case of the properties liste
12、d in items 2 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 (see Table 1, item 1) by means of the following equation: Recalculated result = NOTERecalculation of the results is necessary becaus
13、e hard soaps are liable to lose moisture on keeping. Table 1 Properties and test methods Actual result Specified minimum total fatty matter content Actual total fatty matter content - Property Content Test method % (m/m) 1. Total fatty matter content min. 2. Unsaponified saponifiable matter content
14、max. 3. Ethanol-insoluble matter content max. 4. Total free alkali content (Na 2 O) max. 5. Free caustic alkali content (Na 2 O) max. 6. Chloride content (NaCl) max. 62 0.2 2.0 0.25 0.05 1.25 Described in BS 1715-2.1 Described in BS 1715-2.5 Described in BS 1715-2.11 Described in BS 1715-2.2 and App
15、endix A of this standard Described in BS 1715-2.3 and Appendix B of this standard Described in BS 1715-2.7BS1911:1990 2 BSI 09-1999 Appendix A Determination oftotal free alkali content Use the method described in BS 1715-2.2 except that the calculation and formulae given in 9.1 of BS 1715-2.2:1989 s
16、hould be replaced by the following. The total free alkali content, expressed as a percentage by mass of Na 2 O, is given by the formula: Appendix B Determination of free caustic alkali content Use method A described in BS 1715-2.3 except that the calculation and formula given in 4.5.1 of BS 1715-2.3
17、:1989 should be replaced by the following. The free caustic alkali content, expressed as a percentage by mass of Na 2 O, is given by the formula: where m is the mass of the test portion (in g); V 0 is the volume of the sulphuric acid solution (see 5.2 of BS 1715-2.2:1989) used in the determination (
18、in mL); V 1 is the volume of the potassium hydroxide solution (see 5.3 of BS1715-2.2:1989) used in the titration (in mL); T 0 is the exact amount-of-substance concentration of the sulphuric acid solution (see 5.2 of BS 1715-2.2:1989) (in mol/L); T 1 is the exact amount-of-substance concentration of
19、the potassium hydroxide solution (see 5.3 of BS 1715-2.2:1989) used in the titration (in mol/L). 0.031 V 0 T 0 V 1 T 1 m - 100 where m is the mass of the test portion (in g); V is the volume of the ethanolic hydrochloric acid solution (see 4.2.3 of BS 1715-2.3:1989) used (in mL); T is the amount-of-
20、substance concentration of the ethanolic hydrochloric acid solution (see 4.2.3 of BS 1715-2.3:1989) used (in mol/L). 0.031 VT m - 100 BS1911:1990 BSI 09-1999 Publications referred to BS 1545, Specification for liquid toilet soap 1) . BS 1715, Analysis of soaps. BS 1715-1, General introduction, sampl
21、ing, and test for presence of synthetic anionic-active surface 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, Method for determination of free caustic alkali
22、 content. BS 1715-2.5, Method for determination of unsaponifiable, 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 1912, Specification for soap flakes
23、 1) . BS 1913, Specification for soft soap 1) . BS 1914, Specification for toilet soap 1) . BS 4405, Specification for liquid soap 1) . 1) Referred to in the foreword only.BS1911:1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body respons
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