1、BRITISH STANDARD BS 476-4:1970Incorporatingamendments issuedMarch1978(AMD 2483) andSeptember 1983 (AMD 4390)Fire tests on buildingmaterials andstructures Part 4:Non-combustibility test formaterialsUDC 699.81:620.1CONFIRMED DECEMBER 2007BS 476-4:1970Incorporating amendments issued March 1978 (AMD 248
2、3), September 1983 (AMD 4390) and Corrigendum No. 1ICS 13.220.50BS 476-4:1970This British Standard, havingbeen approved by the FireStandards Committee andendorsed by the Chairmanof theBuilding Divisional Council, was published under the authority ofthe Executive Board on26 January, 1970. BSI 12-1998
3、BS 476 first published inDecember, 1932.First revision, 1953.Part 4first publishedJanuary, 1970.The following BSI references relate to the work on this standard:Committee reference FSM/1,FSM/1/11Draft for comment 67/28189SBN 580 05694 5Cooperating OrganizationsThe Fire Standards Committee, under who
4、se supervision this BritishStandard was prepared,consists of representatives from the followingGovernment departments and scientificand industrialorganizations:Board of Trade*Institution of Civil EngineersCounty Councils Association Institution of Fire Engineers*Department of Employment and Producti
5、vity*Institution of Municipal Engineers*Fire Extinguisher Trades Association Ministry of Housing and Local Government*Chief Fire Officers Association*Ministry of PublicBuilding and Works*Fire Offices Committee inistry of TechnologyFire Protection Association*Ministry of Technology Joint Fire Researc
6、h*Greater London Council*Organization and Fire Offices CommitteeGreater London Council (London Fire National Council of Building MaterialBrigade) ProducersHome Office*Royal Instituteof British Architects*Industrial Fire Protection Association ofGreat BritainThe Government departments and scientifica
7、nd industrialorganizations marked with an asteriskin the abovelist, together with the following, weredirectly represented on the committee entrusted with the preparation of this British Standard:Association of British Roofing Felt Imported Fibre Building Board FederationManufacturers Leathercloth an
8、d Coated Fabrics British Constructional Steelwork Association ManufacturersBritish Fire Services Association MasticAsphalt Employers FederationBritish Plastics Federation Ministry of Technology Forest ProductsBritish Rubber Manufacturers Association Research LaboratoryLtd. National Coal BoardBritish
9、 Steel Industry National Federation of Building TradesBuilding Board Manufacturers Association of EmployersGreat Britain Rubber and Plastics Research Association ofConfederation of British Industry Great BritainDepartment of Education and Science Timber Research and Development Felt Roofing Contract
10、ors Advisory Board AssociationFibre Building Board Development United Kingdom AtomicEnergy AuthorityOrganisation Ltd. Wood Wool Building Slab Manufacturers Gypsum Plasterboard Development AssociationAssociation IndividualmanufacturersAmendments issued sincepublicationAmd. No. Date Comments2483 March
11、19784390 September1983Indicated by a sideline in the marginBS 476-4:1970ISBN 978 0 580 85683 9Amendments/corrigenda issued since publicationAmd. No. Date Comments2483 March 19784390 September 1983 Indicated by a sideline in the marginC1 March 2014 Information added to ForewordThis British Standard,
12、having been approved by the Fire Standards Committee and endorsed by the Chairman of the Building Divisional Council, was published under the authority of the Executive Board on 26 January, 1970. The British Standards Institution 2014 Published by BSI Standards Limited 2014BS 476 first published in
13、December, 1932. First revision, 1953. Part 4 first published January, 1970.The following BSI references relate to the work on this standard: Committee reference FSM/1, FSM/1/11 Draft for comment 67/28189BS 476-4:1970 BSI 12-1998 iContentsPageCo-operating organizations Inside front coverGeneral Forew
14、ord ii1 Scope 12 Definitions 13 Size and number of specimens 14 Preparation of specimens 15 Conditioning of specimens 16 Apparatus 17 Test procedure 28 Designation of non-combustibility 29 Test report2Figure 1G eneral arrangement of non-combustibility apparatus 3Figure 2 Furnace and specimen thermoc
15、ouple4Figure 3 Specimen holder 5BS 476-4:1970i The British Standards Institution 2014BS 476-4:1970ii BSI 12-1998GeneralforewordInorder tokeep abreast of progress in the industries concerned,BritishStandards are subject toperiodicalreview. Suggestions for improvements will berecorded and in due cours
16、e brought to the noticeof the committees charged withthe revision of the standards to which they refer.Acompletelist of British Standards, numbering over 9,000, fully indexed andwith a noteof the contents of each, will befound in the BSI Catalogue whichmay bepurchased from BSISales Department. The C
17、ataloguemay be consulted inmany public libraries and similar Institutions.This standard makes reference to the following British Standard:BS 4422,Glossary of terms associated withfire.BS 476 was first published as a single volume in 1932. A revision was publishedin three parts as follows: Part 1:195
18、3:Fire tests on building materials and structures; Part 2:1955:Flammability test for thin flexible materials; Part 3:1958:Externalfire exposure roof test.In the present revision the three sections of Part 1,covering tests forcombustibility of materials, surface spreadofflame on materials and fireres
19、istanceof structures,havebeenpreparedas separateparts andgivennew part numbers. As eachof theseparts is issued it will supersede the correspondingsection of Part 1. Part 2:1955 is being withdrawn as a result of publicationof BS 2782,“Methodsof testingplastics”,Part 5,“Miscellaneous methods”, whichin
20、cludesMethod508,“Flammability”.Inorder toavoidconfusionnoneof thenew parts will benumbered 1or 2. Part 3:1958 is under revision. Additionalparts forignitability and fire propagation tests are in preparation.This in effect means that the standard will comprise the following parts: Part 3:Externalfire
21、 exposure roof tests; Part 4:Non-combustibility test for materials; Part 5:Ignitability test for materials; Part 6:Fire propagation test for materials; Part 7:Surface spreadofflame test for materials; Part 8:Fire resistance tests for elements of building construction.Other tests being studiedmay res
22、ult in the issueoffurther parts.The need for a glossary covering terms used in BS 476 has been established andthis will bepublished separately as aBritish Standard glossary of terms anddefinitions associated withfire.ForewordThe present standard replaces the combustibility test specified inBS 476-1.
23、1:1953 and is issued under the authority of the Fire Standards Committee. The test has been revised and renamed in the light of practicalexperiencein the United Kingdom and of joint investigation and discussion in aninternational context. The name “non-combustibility test” was thought onbalance to b
24、emore logical than“combustibility test” and in line with theproposals of the International Organizationfor Standardization(ISO).Consideration was given to the possibility of using abombcalorimeter but it was decided not torecommend a test on this basis. The new test recommends that acontinuous recor
25、ding of the furnace temperature is made and requiresobservations as to whether a sample produces a flame. Materials are classified as combustible or non-combustible by identifying those whichmake little or nothermal contribution to the heat of the furnace and do not produce a flame,andby calling the
26、 remainder “combustible”.BS 476-4:1970ii BSI 12-1998GeneralforewordInorder tokeep abreast of progress in the industries concerned,BritishStandards are subject toperiodicalreview. Suggestions for improvements will berecorded and in due course brought to the noticeof the committees charged withthe rev
27、ision of the standards to which they refer.Acompletelist of British Standards, numbering over 9,000, fully indexed andwith a noteof the contents of each, will befound in the BSI Catalogue whichmay bepurchased from BSISales Department. The Cataloguemay be consulted inmany public libraries and similar
28、 Institutions.This standard makes reference to the following British Standard:BS 4422,Glossary of terms associated withfire.BS 476 was first published as a single volume in 1932. A revision was publishedin three parts as follows: Part 1:1953:Fire tests on building materials and structures; Part 2:19
29、55:Flammability test for thin flexible materials; Part 3:1958:Externalfire exposure roof test.In the present revision the three sections of Part 1,covering tests forcombustibility of materials, surface spreadofflame on materials and fireresistanceof structures,havebeenpreparedas separateparts andgiv
30、ennew part numbers. As eachof theseparts is issued it will supersede the correspondingsection of Part 1. Part 2:1955 is being withdrawn as a result of publicationof BS 2782,“Methodsof testingplastics”,Part 5,“Miscellaneous methods”, whichincludesMethod508,“Flammability”.Inorder toavoidconfusionnoneo
31、f thenew parts will benumbered 1or 2. Part 3:1958 is under revision. Additionalparts forignitability and fire propagation tests are in preparation.This in effect means that the standard will comprise the following parts: Part 3:Externalfire exposure roof tests; Part 4:Non-combustibility test for mat
32、erials; Part 5:Ignitability test for materials; Part 6:Fire propagation test for materials; Part 7:Surface spreadofflame test for materials; Part 8:Fire resistance tests for elements of building construction.Other tests being studiedmay result in the issueoffurther parts.The need for a glossary cove
33、ring terms used in BS 476 has been established andthis will bepublished sep rately as aBritish Standard glossary of terms anddefinitions associated withfire.ForewordThe present standar replaces the combustibility test specified inBS 476-1.1:1953 nd is issued under the authority of the Fire Standards
34、 Committee. The test has been revised and renamed in the light of practicalexperiencein the United Kingdom and of joint investigation and discussion in aninternational context. The name “non-combustibility test” was thought onbalance to bemore logical than“combustibility test” and in line with thepr
35、oposals of the International Organizationfor Standardization(ISO).Consideration was given to the possibility of using abombcalorimeter but it was decided not torecommend a test on this basis. The new test recommends that acontinuous recording of the furnace temperature is made and requiresobservatio
36、ns as to whether a sample produces a flame. Materials are classified as combustible or non-combustible by identifying those whichmake little or nothermal contribution to the heat of the furnace and do not produce a flame,andby calling the remainder “combustible”.BS 476-4:1970 The British Standards I
37、nstitution 2014This part of BS 476 is published by BSI Standards Limited, under licence from The British Standards Institution.This standard has been superseded by the current BS EN ISO 1182, but it has been retained based on legitimate need for the standards within non-EU markets.BS 476-4:1970 BSI
38、12-1998 iiiThree samples are required insteadof six as in the earlier test,but the samplesizeremains practically unchanged. A long steel cone is now attached to thebottom of the testing furnace to act as an air-flow stabilizer.As part of BSIs programme of metrication this standard is expressed in me
39、tricterms.The metric values are given in SI units. For further information reference shouldbemade to BS 37631)and PD 56862).ABritish Standard does not purport toinclude all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.Compliance with
40、 aBritish Standard does not of itself confer immunity from legalobligations.Summary of pagesThis document comprises a front cover,aninside front cover, pages i toiv,pages 1 to5and aback cover.This standard has been updated (see copyright date) and may havehadamendments incorporated. This will beindi
41、cated in the amendment table onthe inside front cover.1)BS 3763, “International System (SI) units”.2)PD 5686, “The useof SI units”.BS 476-4:1970 BSI 12-1998 iiiThree samples are required insteadof six as in the earlier test,but the samplesizeremains practically unchanged. A long steel cone is now at
42、tached to thebottom of the testing furnace to act as an air-flow stabilizer.As part of BSIs programme of metrication this standard is expressed in metricterms.The metric values are given in SI units. For further information reference shouldbemade to BS 37631)and PD 56862).ABritish Standard does not
43、purport toinclude all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.Compliance with aBritish Standard does not of itself confer immunity from legalobligations.Summary of pagesThis document comprises a front cover,aninside front cover,
44、 pages i toiv,pages 1 to5and aback cover.This standard has been updated (see copyright date) and may havehadamendments incorporated. This will beindicated in the amendment table onthe inside front cover.1)BS 3763, “International System (SI) units”.2)PD 5686, “The useof SI units”.BS 476-4:1970ii BSI
45、12-1998GeneralforewordInorder tokeep abreast of progress in the industries concerned,BritishStandards are subject toperiodicalreview. Suggestions for improvements will berecorded and in due course brought to the noticeof the committees charged withthe revision of the standards to which they refer.Ac
46、ompletelist of British Standards, numbering over 9,000, fully indexed andwith a noteof the contents of each, will befound in the BSI Catalogue whichmay bepurchased from BSISales Department. The Cataloguemay be consulted inmany public libraries and similar Institutions.This standard makes reference t
47、o the following British Standard:BS 4422,Glossary of terms associated withfire.BS 476 was first published as a single volume in 1932. A revision was publishedin three parts as follows: Part 1:1953:Fire tests on building materials and structures; Part 2:1955:Flammability test for thin flexible materi
48、als; Part 3:1958:Externalfire exposure roof test.In the present revision the three sections of Part 1,covering tests forcombustibility of materials, surface spreadofflame on materials and fireresistanceof structures,havebeenpreparedas separateparts andgivennew part numbers. As eachof theseparts is i
49、ssued it will supersede the correspondingsection of Part 1. Part 2:1955 is being withdrawn as a result of publicationof BS 2782,“Methodsof testingplastics”,Part 5,“Miscellaneous methods”, whichincludesMethod508,“Flammability”.Inorder toavoidconfusionnoneof thenew parts will benumbered 1or 2. Part 3:1958 is under revision. Additionalparts forignitability and fire propagation tests are in preparation.This in effect means that the standard will comprise the following parts: Part 3:Externalfire exposure roof tests; Part 4:Non-combustibility test
