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1、a Date: 17 December 2008 Origin: National Latest date for receipt of comments: 28 FEBRUARY 2009 Project no.: 2008/03815 Responsible committee: FSH/21/1 European fire test methods Interested committees: FSH/21, FSH/21/5 Title: Draft BS 476-6+A1 Fire tests on building materials and structures Part 6:
2、Method of test for fire propagation for products Supersession information: If this document is published as a standard, the UK implementation of it will supersede BS 476-6:1989 and partially supersede NONE. If you are aware of a current national standard which may be affected, please notify the secr
3、etary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 28 FEBRUARY 2009. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowl
4、edgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. El
5、ectronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email . British, International and foreign standards are also available from BSI Customer
6、 Services. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via t
7、he British Standards Online Service on the BSI web site http:/. Direct tel: 020 8996 7811 Responsible Content Developer: Mrs Alice Kasasian Brown (BSI) E-mail: alice.kasasian- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7
8、001 Form 36 Version 8.0 DPC: 09/30193141 DC Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:45, Uncontrolled Copy, (c) BSI b Introduction Your comments on this draft are invited and will assist in the preparation of the resulting British Standard. If no comments are
9、 received to the contrary, this draft may be implemented unchanged as a British Standard. Please note that this is a draft and not a typeset document. Editorial comments are welcomed, but you are advised not to comment on detailed matters of typography and layout. Submission of comments The guidance
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13、 your comment will not be judged or modified; similarly, your grammar or spelling will not be corrected. A link to the BSI British Standards Draft Review system, or to a specific draft hosted on the system, may be distributed to other interested parties so that they may register and submit comments.
14、 It is not necessary to purchase a copy of the draft in order to review or comment on it; however, additional copies of this draft may be purchased from BSI, Tel: +44(0) 20 8996 9001 or email: . Drafts and standards are also available in PDF format for immediate download from the BSI Shop http:/ Lic
15、ensed Copy: London South Bank University, South Bank University, 02/02/2009 05:45, Uncontrolled Copy, (c) BSI WARNING. THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 28 FEBRUARY 2009. 5.2 Combustion chamber Delete current text and replace wit
16、h the following. “The walls of the chamber shall be made from 12 mm thick calcium silicate board having a nominal dry density of 1 400 kg/m3. The calcium silicate shall also have the following properties: Properties Value Flexural strength 23 MPa Hardness 80 Shore D Maximum service temperature 1 000
17、 C Thermal conductivity 0.49 W/mK Shrinkage (750 C for 12 h) 0.14% 1.1% Coefficient thermal expansion 6.6 10-6 The internal dimensions of the chamber shall be 190 mm 190 mm 90 mm. An air inlet slot measuring 96 mm 25 mm and a mica observation window measuring 50 mm 50 mm shall be provided together w
18、ith a hole for the discharge of combustion gases and a suitable fixing for the chimney and cowl. A steel baffle plate 200 mm 40 mm shall be fixed horizontally to the top of the combustion chamber above the window. Four steel rods shall be fitted to the combustion chamber to enable the specimen holde
19、r to be located and fixed firmly in position during each test.” 5.3 Specimen holder Delete current text and replace with the following. “The specimen holder shall be made from calcium silicate board having the same dry density and properties as that of the walls of the combustion chamber (see 5.2). The holder shall be recessed to take a specimen of area 225 mm 225 mm and a recess depth of 12.5 mm, 25 mm or 50 mm, depending upon the thickness of the specimen to be tested.” Licensed Copy: London South Bank University, South Bank University, 02/02/2009 05:45, Uncontrolled Copy, (c) BSI
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