BS-684-1.7-1976.pdf
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1、BRITISH STANDARD CONFIRMED APRIL 1993 BS 684-1.7: 1976 Methods of analysis of Fats and fatty oils Part 1: Physical methods Section 1.7: Determination of surface-drying time IMPORTANT NOTE. It is essential that this Section be read in conjunction with the information in the “General introduction” to
2、BS 684, which is published separately. UDC 665.1.014:543:667.612.82 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:15:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 684-1.7:1976 This British Standard, having been prepared under the direction of the Oils and Fats Standards Committee, was
3、 published under the authority of the Executive Board on 29 October 1976 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference OFC/24 Draft for comment 74/50396 DC ISBN 0 580 09135 X A British Standard does not purport to include all the necessary provisio
4、ns 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, pages i and ii, pages 1 and 2 and a
5、 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 issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06
6、 13:15:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 684-1.7:1976 BSI 11-1999i Contents Page 1Scope1 2References1 3Definitions1 4Principle1 5Apparatus1 6Sampling and preparation of sample for analysis1 7Procedure1 8Expression of results2 9Test report2 Licensed Copy: sheffieldun sheffieldun, na, W
7、ed Dec 06 13:15:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:15:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 684-1.7:1976 BSI 11-19991 1 Scope This Section describes a method for determining the surface-drying characteristics of
8、 a film of oil and is similar to that described in BS 3900-C2. The method may be carried out either as a “go/no go” test by determining the surface-drying state after a specified time to assess compliance with a particular requirement, or by determining the surface-drying state at suitable intervals
9、 until the surface-drying time is obtained. 2 References The following standards publications are referred to in this Section: BS 245, White spirit. BS 410, Test sieves. BS 458, Xylenes. BS 1796, Methods for the use of British Standard fine-mesh test sieves. BS 3900, Methods of test for paints Part
10、C2: Surface-drying time (ballotini method). 3 Definitions For the purposes of this Section of BS 684 the following definitions apply. 3.1 surface-drying state general term describing the state of the surface of a film of oil, i.e. whether “surface-dry” or not 3.2 surface-dry surface-drying state of
11、a film of oil when ballotini can be lightly brushed away without damaging the surface of the film 3.3 surface-drying time period of time between that at which a film of oil is applied to a prepared test panel, and that at which the film is assessed as just surface-dry by the procedure described in c
12、lause 7 4 Principle Ballotini are poured on the film under specified conditions, then brushed away and the film examined visually. 5 Apparatus The following items of apparatus are required (see also BS 684: General introduction). 5.1 Test panel, of polished plate glass approximately 100 mm 150 mm. 5
13、.2 Ballotini (transparent solid glass spheres), graded so that none passes a sieve of nominal aperture 125 4m, all pass a sieve of nominal aperture 335 4m, and at least 75 % (m/m) pass a sieve of nominal aperture 250 4m but are retained on a sieve of nominal aperture 180 4m. (The test sieves used sh
14、all comply with BS 410 and the testing shall be carried out in accordance with BS 1796.) 5.3 Camel-hair brush 5.4 Stopwatch or stopclock 6 Sampling and preparation of sample for analysis See BS 684: General introduction. 7 Procedure 7.1 Preparation of test panel. Prepare the test panel by one of the
15、 following methods. 7.1.1 Solvent wash. Wash the panel three times with an excess of a suitable solvent. (e.g. white spirit complying with BS 245 or xylene complying with BS 458) using a clean piece of cloth soaked in the solvent. Allow the clean panel to dry either by evaporation of the solvent or
16、by lightly wiping with a clean linen cloth, if necessary warming very slightly to remove traces of condensed moisture. 7.1.2 Detergent wash. Wash the panel thoroughly in aqueous non-ionic detergent solution and then rinse thoroughly with distilled water. Dry by wiping with a clean linen cloth, if ne
17、cessary warming very slightly to remove traces of condensed moisture. 7.2 Application. Brush the oil on to the surface of a prepared test panel (5.1). 7.3 Drying. Place the panel in a vertical position in a well ventilated room at a temperature of 16 C to 21 C and a relative humidity of 60 % to 70 %
18、 so that the surface of the panel is illuminated by diffused daylight for at least 6 h during each day of the drying period. In order to avoid interference through deposition of moisture on the oil film, take care that throughout the drying process the temperature of the room is above the dew point.
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