1、BRITISH STANDARD BS 6645:1985 Method for Determination of alkali solubility of flax materials UDC 677.11.07.014.27:541.8:54-36BS6645:1985 This British Standard, having been prepared under the directionof the Textiles andClothing Standards Committee,was published underthe authority of the Board of BS
2、I and comes into effect on 30 April 1985 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference TCM/26 Draft for comment 84/39979 DC ISBN 0 580 14662 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted b
3、y the Textiles and Clothing Standards Committee (TCM/-) to Technical Committee TCM/26 upon which the following bodies were represented: British Carpet Manufacturers Association Ltd. Department of Trade and Industry (Laboratory of the Government Chemist) International Wool Secretariat Man-made Fibres
4、 Producers Committee Manchester Testing House Ministry of Defence Textile Research Council Amendments issued since publication Amd. No. Date of issue CommentsBS6645:1985 BSI 02-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Apparatus and reagents
5、 1 4 Procedure 1 5 Calculation and expression of results 1 6 Test report 1 Publications referred to Inside back coverBS6645:1985 ii BSI 02-2000 Foreword This British Standard has been prepared under the direction of the Textiles and Clothing Standards Committee. This method was included in the 1974
6、edition of BSHandbook No.11 “Methods of test for textiles” as a recommended method. However, due to the wide usage of this method it had been decided that it be revised and published as a British Standard. The major change from the method in Handbook No. 11 is that the test specimens are dried to co
7、nstant mass before testing rather than being conditioned. At the time of publication of this British Standard, no corresponding International Standard exists. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for the
8、ir 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, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (se
9、e copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6645:1985 BSI 02-2000 1 1 Scope This British Standard describes a method for determination of the alkali solubility of flax materials. NOTEThe titles of the publicati
10、ons referred to in this British Standard are listed on the inside back cover. 2 Principle The alkali solubility is a measure of the non-cellulosic constituents (readily available as foodstuffs for micro-organisms) left in commercially boiled flax materials. It is determined by further boiling the ma
11、terial in a relatively strong solution of sodium carbonate. The percentage loss in mass during this process less the percentage loss in mass on boiling in water alone, is the alkali solubility of the material. 3 Apparatus and reagents 3.1 Conical flasks, 500 mL with reflux condensers. 3.2 Large Buch
12、ner funnel, approximately 150 mm in diameter. 3.3 Filter paper 3.4 Oven, capable of maintaining a temperature of105 3 C. 3.5 Balance, having an accuracy of 0.1 mg. 3.6 Sodium carbonate, 50 g/L solution of analytical reagent quality. 3.7 Distilled water, complying with BS 3978. 3.8 Sintered glass cru
13、cibles, complying with grade P160 of BS 1752. 3.9 Weighing bottle 4 Procedure Prepare two specimens each of about 3g. Dry the specimens in the oven (3.4) at105 3 C until constant mass is achieved. Record the dry mass of the specimens. In a 500 mL conical flask fitted with a reflux condenser (3.1), b
14、oil250mL of the sodium carbonate solution (3.6). Add one specimen to the boiling solution and boil it for2.5h. Decant the liquid and replace it by200mL of distilled water(3.7) at about70 C. Filter the liquid through a hardened filter paper (3.3) on the Buchner funnel(3.2). Wash the specimen four tim
15、es by decanting with200mL of distilled water at about70 C, and pass the washings through the filter. Transfer the specimen to the sintered glass crucible(3.8), wash it three times with200mL of distilled water at about70 C and dry it in an oven at105 3 C for1h. Then transfer the specimen to the weigh
16、ing bottle (3.9) and dry it to constant mass at105 3 C. NOTEThe mass is considered to be constant when successive weighings show no mass change greater than0.05%. Add the second specimen to250mL of boiling distilled water and gently boil for2.5h. Then conduct the washing and filtering and determinat
17、ion of mass as prescribed for the first specimen. 5 Calculation and expression of results Calculate the percentage losses in mass, referred to the oven-dry mass, produced by boiling with the sodium carbonate solution and with the distilled water. The difference between these two losses is the alkali
18、 solubility expressed as a percentage by mass. 6 Test report The test report shall include the following: a) the number and date of this British Standard; b) the description of the sample tested; c) the test result (see clause 5); d) the details of any deviation from the test procedure.2 blankBS6645
19、:1985 BSI 02-2000 Publications referred to BS 1752, Specification for laboratory sintered or fritted filters including porosity grading. BS 3978, Water for laboratory use. Handbook No. 11, Methods of test for textiles 1) . 1) Referred to in the foreword only.BS 6645:1985 BSI 389 Chiswick High Road L
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