BS-3523-1991.pdf
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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 3523 : 1991 Incorporat
2、ing Amendment No. 1 ICS 71.100.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Granular desiccant silica gel impregnated with cobalt chloride Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3523
3、 : 1991Issue 2, September 1997 This British Standard, having been prepared 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 1997 First published July 1962 Second edition August 1991 T
4、he following BSI references relate to the work on this standard: Committee reference CIC/2 Draft for comment 90/57701 DC ISBN 0 580 19690 9 Amendments issued since publication Amd. No.DateText affected 9655September 1997 Indicated by a sideline in the margin Committees responsible for this British S
5、tandard The preparation of this British Standard was entrusted by the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/2, upon which the following bodies were represented: Chemical Industries Association Ministry of Defence Royal Society of Chemistry Society of British Aerospa
6、ce Companies Ltd. Society of Environmental Engineers Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Issue 1, September 1997BS 3523 : 1991 BSI 1997a Summary of pages The following table identifies the current issue of each page. Issue 1 indi
7、cates that a page has been introduced for the first time by amendment. Subsequent issue numbers indicate an updated page. Vertical sidelining on replacement pages indicates the most recent changes (amendment, addition, deletion). PageIssuePageIssue Front cover Inside front cover a b 1 2 2 1 blank or
8、iginal 2 3 4 Inside back cover Back cover original original 2 original 2 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI bblank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 352
9、3 : 1991 1 Contents Page Committees responsibleInside front cover Foreword2 Specification 1Scope3 2Sampling3 3Moisture content3 4pH3 5Water soluble sulphates3 6Adsorptive capacity3 7Particle size3 8Ammonia and ammonium compounds3 9Cobalt chloride3 10Friability and dust3 11Packaging3 12Marking3 Table
10、 1Chemical and physical properties4 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 07:32:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3523 : 1991 2 Foreword This British Standard has been prepared under the direction of the Chemicals Standards Policy Committee and supersedes BS 3523 : 19
11、62, which is withdrawn. This British Standard applies to material to be used in a wide range of equipment in the electronics, optics, telecommunications and defence industries. In specific cases, the material is also used for drying gas streams and solvents. The principal changes between this revisi
12、on and the previous edition are as follows: (a) test methods are now contained in a separate standard, BS 3482 : 1991; (b) particle size ranges have been more clearly specified. Compliance with a British Standard does not of itself confer immunity from legal obligations. Licensed Copy: sheffieldun s
13、heffieldun, na, Wed Nov 29 07:32:54 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 BS 3523 : 1991 1) Marking BS 3523 : 1991 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of t
14、he standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable. Specification 1 Scope This British Standard specifies requirements for gra
15、nular silica gel impregnated with cobalt chloride for use as a desiccant. This material is suitable for use in containers and plugs for incorporation into electronic, electrical, telecommunications, optical, electrothermal and other equipment or products requiring protection from water vapour. NOTE.
16、 The titles of the publications referred to in this British Standard are listed on the inside back cover. 2 Sampling Test samples shall be prepared in accordance with BS 3482 : Part 1. For preparation of the dried sample, 75 g of the laboratory sample shall be dried for 4 h in an oven controlled at
17、1452.5 C. NOTE. Desiccant silica gel is highly hygroscopic and should be exposed to the atmosphere for the minimum possible period of time during sampling. 3 Moisture content When determined in accordance with BS 3482 : Part 2 the moisture content dried at 1452.5 C for 4 h shall not exceed the value
18、 given in table 1. 4 pH When determined in accordance with BS 3482 : Part 3 the pH shall be not lower than the value given in table 1. 5 Water soluble sulphates When determined in accordance with BS 3482 : Part 5 the content of water soluble sulphates shall not exceed the value given in table 1. 6 A
19、dsorptive capacity When determined at 50 % r.h. and at 25 C in accordance with method A of BS 3482 : Part 6 : 1991 the adsorptive capacity of material dried at 1452.5 C for 4 h shall be not less than the value given in table 1. 7 Particle size When determined and expressed in accordance with BS 3482
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