1、BRITISH STANDARD BS3762-4.1: 1989 Analysis of formulated detergents Part 4: Physical test methods Section 4.1 Method for determination of clear point of liquid detergents NOTEIt is recommended that this Section be read in conjunction with the information in the “General introduction”, published sepa
2、rately as BS3762-0. UDC661.185.6:620.1BS3762-4.1:1989 This BritishStandard, having been prepared under the directionof the Chemicals Standards Committee, waspublished under the authorityofthe Board ofBSIandcomes intoeffect on 28February1989 BSI12-1999 The committees responsible for this BritishStand
3、ard are shown inPart 0. The following BSI references relate to the work on this standard: Committee referenceCIC/34 Draft for comment87/51453DC ISBN 0 580 17072 1 Foreword This Section of BS3762 has been prepared under the direction of the Chemicals Standards Committee and supersedes method3 in Part
4、3 of BS3762:1964, which is being deleted by amendment. This standard describes a method of test only and should not be referred to as a specification defining limits of purity. Reference to the standard should indicate that the method of test used is in conformity with BS3762-4.1. A British Standard
5、 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 comprises a front cover, an
6、inside front cover, pagesi andii, page1 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. Amendments issued since publication Amd. No. Date of issue CommentsBS3762-4
7、.1:1989 BSI 12-1999 i Contents Page Foreword Inside front cover 1 Scope 1 2 Principle 1 3 Apparatus 1 4 Procedure 1 5 Precision 1 6 Test report 1ii blankBS3762-4.1:1989 BSI 12-1999 1 1 Scope This Section of BS3762 describes a method for the determination of the clear point of liquid detergents. The
8、method is not applicable to solutions that become cloudy on heating (for example solutions of ethylene oxide adducts) or to solutions that do not deposit solids other than ice on cooling to15 C. 2 Principle The sample is cooled until solids other than ice separate, and is then gradually warmed and s
9、tirred and the temperature at which a clear solution forms is noted. 3 Apparatus Ordinary laboratory apparatus and the following are required. 3.1 Cooling bath, of minimum depth150mm and minimum diameter, or length of side,100mm, containing a suitable fluid, for example water with ice and ammonium c
10、hloride (for clear points above5 C) or acetone with solid carbon dioxide (for clear points between+5 C and15 C). 3.2 Test tube,150mm 25mm. 3.3 Thermometer, of range extending to5 C (or more) above and below the expected clear point and graduated in0.5 C or less. 4 Procedure Place approximately15mL o
11、f the sample into the test tube(3.2) and immerse it in the cooling bath(3.1). Cool the sample, while stirring, until solid material other than ice separates. NOTEIt may be necessary to cool the sample to about15 C and to keep it at this temperature for a short time before any solid material separate
12、s. After solid material has separated, introduce the thermometer(3.3), unless it is already in the sample. Heat the bath at such a rate that the temperature of the sample rises at not more than0.5 C/min, while stirring the sample. Note the temperature at which the sample clears and record this as th
13、e clear point. 5 Precision The repeatability for most materials is1 C or less. 6 Test report The test report shall include the following information: a) a reference to this BritishStandard, i.e.BS3762-4.1:1989; b) the result; c) a complete identification of the sample.BS3762-4.1: 1989 BSI 389 Chiswi
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