BS-2540-1991.pdf
《BS-2540-1991.pdf》由会员分享,可在线阅读,更多相关《BS-2540-1991.pdf(8页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 2540:1991 Incorporating Amendments Nos. 1 and 2 Specification for Granular desiccant silica gel ICS 55.040; 71.100.99 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2540:1991 This British Standard, having been prepare
2、d under the direction of the Chemicals Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 30 August 1991 BSI 03-2000 First published November 1954 Second edition January 1960 Third edition The following BSI references relate to the work on t
3、his standard: Committee reference CIC/2 Draft for comment 90/57700 DC ISBN 0 580 19695 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/2, upon which the following
4、bodies were represented: Chemical Industries Association Ministry of Defence Royal Society of Chemistry Society of British Aerospace Companies Ltd. Society of Environmental Engineers Amendments issued since publication Amd. No.DateComments 6935November 1991 9654September 1997 Indicated by a sideline
5、 in the margin Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2540:1991 BSI 03-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Sampling1 3Moisture content1 4pH1 5Water soluble chlorides1 6Water soluble su
6、lphates1 7Adsorptive capacity1 8Particle size1 9Ammonia and ammonium compounds1 10Friability and dust1 11Packaging1 12Marking1 Table 1 Chemical and physical properties2 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:34:54 GMT+00:00 2006, Uncontr
7、olled Copy, (c) BSI BS 2540:1991 ii BSI 03-2000 Foreword This British Standard has been prepared under the direction of the Chemicals Standards Policy Committee and supersedes BS 2540:1960, which is withdrawn. This British Standard applies to material to be used in a wide range of equipment in the e
8、lectronics, optics, telecommunications and defence industries. In specific cases, the material is also used for drying gas streams and solvents. The principal changes between this revision and the previous edition are as follows: a) test methods are now contained in a separate standard, BS 3482:1991
9、; b) particle size ranges have been more clearly specified. 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 itself confer immunity from
10、legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 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 indicated in the amendmen
11、t table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:34:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2540:1991 BSI 03-20001 1 Scope This British Standard specifies requirements for granular silica gel for use as a desiccant. This material is suitable for u
12、se in containers and plugs for incorporation into electronic, electrical, telecommunications, optical, electrothermal and other equipment or products requiring protection from water vapour. NOTEThe titles of the publications referred to in this British Standard are listed on the inside back cover. 2
13、 Sampling Test samples shall be prepared in accordance with BS 3482-1. For preparation of the dried sample, 75 g of the laboratory sample shall be dried for 4 h in an oven controlled at 145 2.5 C. NOTEDesiccant silica gel is highly hygroscopic and should be exposed to the atmosphere for the minimum
14、possible period of time during sampling. 3 Moisture content When determined in accordance with BS 3482-2 the moisture content dried at 145 2.5 C for 4 h shall not exceed the value given in Table 1. 4 pH When determined in accordance with BS 3482-3 the pH shall be not lower than the value given in Ta
15、ble 1. 5 Water soluble chlorides When determined in accordance with BS 3482-4 the content of water soluble chlorides shall not exceed the value given in Table 1. 6 Water soluble sulphates When determined in accordance with BS 3482-5 the content of water soluble sulphates shall not exceed the value g
16、iven in Table 1. 7 Adsorptive capacity When determined at 50 % r.h. and at 25 C in accordance with method A of BS 3482-6:1991 the adsorptive capacity of material dried at 145 2.5 C for 4 h shall be not less than the value given in Table 1. 8 Particle size When determined and expressed in accordance
17、with BS 3482-7, the particle size range shall be as given in Table 1. NOTEFor guidance, three recommended size grades are given in Table 1, designated coarse, mid and fine. 9 Ammonia and ammonium compounds When determined in accordance with method A of BS 3482-8:1991 the content of ammonia and ammon
18、ium compounds shall not exceed the value given in Table 1. 10 Friability and dust When determined in accordance with BS 3482-11, the level of friability and dust shall not exceed the value given in Table 1. 11 Packaging The material shall be supplied in sound, clean and dry containers, which are air
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS 2540 1991
链接地址:https://www.31doc.com/p-3732578.html