1、BRITISH STANDARD BS 1913:1990 Specification for Soft soapBS1913:1990 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Board of BSIandcomes into effect on 31October 1990 BSI 10-1999 First published Febru
2、ary 1953 Second edition July 1966 Third edition June 1985 Fourth edition October 1990 The following BSI references relate to the work on this standard: Committee reference CIC/34 Draft for comment 89/55506 DC ISBN 0 580 18726 8 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 CommentsBS1913:1990 BSI 10-1999 i Contents Page Committees responsible Inside front cover
5、 Foreword ii 1 Scope 1 2 Classification 1 3 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 Publication(s) referred to Inside back coverBS1913:1990 ii BSI 10-1999 Foreword This revisi
6、on of BS 1913 has been prepared under the direction of the Chemicals Standards Policy Committee. It supersedes the 1985 edition of BS 1913, which is withdrawn and from which it differs principally in that the references to test methods have been changed to take account of the partial revision of BS1
7、715:1963, 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 for hard soap. BS 1912, Specif
8、ication for soap flakes. BS 1914, Specification for toilet soap. BS 4405, Specification for liquid soap. Soft soap is distinguished from ordinary soap by its soft, jelly-like texture, and thus is usually packed in metal or waxed paper containers. A British Standard does not purport to include all th
9、e 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 comprises a front cover, an inside front cover, pagesiandii, pa
10、ges1 and 2, an inside back cover andabackcover. 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.BS1913:1990 BSI 10-1999 1 1 Scope This British Standard specifies requirements and giv
11、es corresponding test methods for two types of soft soap with a potassium or sodium base, or a mixture of these bases. It does not apply to soaps for medicinal purposes. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Classification Two types of
12、 soft soap are classified (see Table 1). Type A is suitable for general toilet purposes and type B for domestic cleaning purposes. 3 Properties 3.1 The contents of soft soap shall be as given in Table 1. Compliance shall be checked by the methods given in Table 1 and in accordance with 3.3 using ana
13、lysis samples prepared as described in BS 1715-1. 3.2 In the case of the properties listed in items 2 and3 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, item 1) by means of
14、the following equation: Recalculated result = NOTERecalculation of the results is necessary because soft soap is liable to lose moisture on keeping. 3.3 The soft soap shall not become liquid at 32 C, and no liquid shall separate when the soap is maintained at 0 1 C for 24 h. Table 1 Properties and t
15、est methods Actual result Specified minimum total fatty matter content Actual total fatty matter content - Property Content Test method Type A Type B 1. Total fatty matter content min. % (m/m) 38 % (m/m) 28 Described BS1715-2.1 2. Total free alkali content (K 2 O) max. 1.0 1.0 Described in BS1715-2.
16、2 and Appendix A of this standard 3. Free caustic alkali content (K 2 O) max. 0.1 0.5 Described in BS1715-2.3 and Appendix B of this standardBS1913:1990 2 BSI 10-1999 Appendix A Determination of total free alkali content Use the method described in BS 1715-2.2 except that the calculation and formula
17、e given in 9.1 of BS1715-2.2:1989 should be replaced by the following. The total free alkali content, expressed as a percentage by mass of K 2 O, is given by the formula: Appendix B Determination of free caustic alkali content Use method B described in BS 1715-2.3 except that the calculation and for
18、mula given in 5.5.1 of BS1715-2.3:1989 should be replaced by the following. The free caustic alkali content, expressed as a percentage by mass of K 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 1715-2.2:1
19、989) used in the determination (in mL); V 1 is the volume of the potassium hydroxide solution (see 5.3 of BS 1715-2.2:1989) used in titration (in mL); T 0 is the amount-of-substance concentration of the sulphuric acid solution (see 5.2 of BS1715-2.2:1989) (in mol/L); T 1 is the exact amount-of-subst
20、ance concentration of the potassium hydroxide solution (see 5.3 of BS 1715-2.2:1989) used in the titration (in mol/L). 0.047 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 hydrochloric acid solution (see 5.2.1 of BS 1715-2.3:1989) used(in mL); T is the
21、 amount-of-substance concentration of the hydrochloric acid solution (see 5.2.1 of BS 1715-2.3:1989) used (in mol/L). 0.047 VT m - 100 BS1913:1990 BSI 10-1999 Publication(s) referred to BS 1545, Specification for liquid toilet soap 1) . BS 1715, Analysis of soaps. BS 1715-1, General introduction, sa
22、mpling, and test for presence of synthetic anionic-active surface activeagents. 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 alka
23、li content. BS 1911, Specification for hard soap 1) . BS 1912, Specification for soap flakes 1) . BS 1914, Specification for toilet soap 1) . BS 4405, Specification for liquid soap 1) . 1) Referred to in the foreword only.BS1913:1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstit
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