Fire Safty Perf Material

LUL Ref. No.: LUL/WN/00356 Written Notice Suppliers Ref. No.: Connect

1. Written Notice Completed By Responsible Manager: Kevin Payne

Directorate: CED

Date issued: 19 April 2005

Details of Standard Requiring Clarification Title: Fire safety performance of materials

Reference No.: 2-01001-002

Issue No.: A1

2.

Clause/Paragraph No.: Section 5.2.3, Paragraph 1

Details of Definitive LUL Interpretation of Requirements Title: Toxic Fume Emmission Requirements

3.

Section 5.2.3, Paragraph 1 of this Standard contains an erroneous reference to Section 8.4 of this Standard, which does not exist.

Section 5.2.3, Paragraph 1 of this Standard should read as follows:

1 Evidence is required that materials do not contain amounts of chemical elements which could produce significant amounts of toxic fumes as detailed below. This evidence should be in the form of qualitative elemental analysis using X ray dispersive fluorescence (XRF) scanning microscopy. Low atomic weight elements should be detected using gas chromatography.

© 2003 No part of this publication may be reproduced without prior written consent from London Underground LtdFile ref.: 2-01001-002A1.DOC Page 1 of 14

Category: CAT 1

Number: 2-01001-002

Issue No A1

Issue date: December 2003

London Underground Limited

Fire safety performance of materials.Contents1. Purpose _______________________________________________________________________ 22. Scope _________________________________________________________________________ 23. Requirements ___________________________________________________________________ 2

3.1 The standard _____________________________________________________________ 23.2 Test programmes _________________________________________________________ 33.3 Compatibility with the Fire Precautions (Sub-Surface Stations) Regulations 1989 ________ 43.4 Evidence of compliance ____________________________________________________ 5

4. Responsibilities__________________________________________________________________ 55. Supporting information ____________________________________________________________ 5

5.1 Background ______________________________________________________________ 55.2 Other supporting information_________________________________________________ 55.2.1 Materials categories ______________________________________________________ 55.2.2 Tests__________________________________________________________________ 75.2.3 Toxic fume emission requirements___________________________________________ 95.3 Safety considerations _____________________________________________________ 11

6. Informative references ___________________________________________________________ 116.1 References _____________________________________________________________ 116.2 Abbreviations____________________________________________________________ 126.3 Definitions ______________________________________________________________ 126.4 Document history_________________________________________________________ 14

A Standard is defined as:A mandatory document, which sets out minimum requirements, expressed as outputs; or a mandatorydocument, which defines an interaction or commonality, which meets a defined LUL requirement.

Authorised by: Date:

Approved by: Date:

Standard owner: Date:

Title: Fire safety performance of materials.Reference no.: 2-01001-002

Issue Number A1Issue date: December 2003


1. Purpose1.1 The purpose of this Standard is to define the requirements for the fire safety performance of materials, interms of flammability, smoke emission and toxic fume emission, installed on the London UndergroundLimited (LUL) network:

a) In stations covered by Section 12 of the Fire Precautions (Sub-surface Railway Stations)Regulations 1989 and in E1045;

b) In passenger and engineering trains;

c) In running tunnels;

d) In other locations that are not effectively separated from locations covered by a) or c) above;and

e) In all other locations where risks from flammability, smoke or toxic fumes are not controlledto a level as low as is reasonably practicable by other means.

1.2 The business objective of this standard is to ensure that the risk to which the public and employees areexposed is controlled to a level as low as reasonably practicable.

2. Scope2.1 This standard applies to both permanent and temporary installations.

2.2 The test methods detailed in this standard are as specified within the referenced British and EuropeanStandards. However, this standard gives guidance relating to which tests apply to different categories ofmaterial (ie seats, cables etc), and the required pass criteria for different locations (ie stations, rolling stockinteriors etc)

2.3 Reference shall be made to M1042, Manual of Good Practice, Code of Practice : Fire Safety of Materialsused in the Underground.

Note: M1042 replaces the previously issued documents including Code of Practice - Fire Safety ofMaterials used in the Underground’ (1990), Specification for fire performance of materials used in theunderground: 1991 and Fire safety performance requirements for materials used in the underground:1992. The principles described in M1042 remain valid, although some of the posts to which referenceis made no longer exist.

2.4 This standard replaces E1042 A6. The Standard has been re formatted and re-numbered. There wereno technical changes

3. Requirements

3.1 The standard3.1.1 Fire Materials Management

3.1.1.1 Acceptance of reduced performance requirements in the following circumstances shall be justified byan appropriate risk assessment (see 2-05102-201), including:-

a) the material being in a fire compartment;




b) the presence of approved fire detection and/or fire suppression devices (e.g. equipmentrooms and staff areas)

c) ease of evacuation (e.g. open stations);

d) no potential for accumulation of smoke and toxic fumes (e.g. open stations);

e) staff trained in evacuation procedures (e.g. workshops).

3.1.1.2 The appropriate risk assessment, referred to in clause 3.1.1.1, shall demonstrate that the riskspresented by flammability, smoke and toxic fumes are as low as reasonable practicable.

3.1.1.3 The LUL Procedure for the management of waivers for the fire safety performance of materials is setout in 2-05304-010. Information about the surrounding environment of the location shall be brought to theattention of the Waiver Committee for their consideration, together with confirmation that it is a multiplerequest, if more than two waivers per location are being sought.

3.1.2 Flammability

Any material installed shall comply with the pass criteria listed in Clauses 5.2.1 and 5.2.2.

3.1.3 Smoke emission

3.1.3.1 A materials installation shall not be responsible for generating smoke which will reduce the specificvisibility distance to below 10 metres.

3.1.3.2 As far as reasonably practicable the general visibility distance should remain above 10 metres.

3.1.3.3 The requirements for smoke emission are as detailed in clause 5.1.2 and 5.2.2

3.1.4 Toxic fume emission

3.1.4.1 No materials installation shall be responsible for causing irreversible health effects or significantlyimpair escape due to toxic fumes. This should be interpreted as keeping the levels of toxic gases to belowtheir IDLH level.

3.1.4.2 In addition, fumes shall not degrade the integrity of safety critical equipment as prescribed within therelevant asset standards.

3.1.4.3 The requirements for toxic fume emission are as detailed in clause 5.2.3.

3.2 Test programmesThe test programmes to be used to demonstrate that specified standards can be met are detailed in clause5.2.2. The test programmes have been designed to be as realistic as possible.

The following points shall be noted when referring to the programmes.

3.2.1 Materials categories

Meaningful fire safety tests are designed to reflect the usage of the material because the burning behaviourof a material depends critically on its form and disposition.

Consequently, several test programmes have been designed for various “materials categories" (e.g.surfaces, cables).




3.2.2 Types of test

There shall be at least three types of test in a test programme to demonstrate compliance with therequirements set in 3.1.2, 3.1.3 and 3.1.4.

3.2.3 Locations

The performance requirements for materials usage in rolling stock are more stringent than for usage instations; this reflects the lower dispersal volume for smoke and toxic fumes and the potentially longerevacuation time from rolling stock.

3.2.4 Items to be tested

The performance of a material in the tests and in real fires is dependent on the disposition of the material andits interactions with surrounding materials. Thus, in many cases it is necessary to test composite samples insome or all the tests. For example, the smoke emission test would be carried out on a complete cable andnot the individual components. Where material samples differ only in colour, re-testing is only required if thecolourant exceeds 5% (w/w). Notes are included in the test programmes to indicate what test pieces shouldbe used.

3.2.5 Test results

3.2.5.1 If a material (or composite) fully complies with the requirements of a test programme for a particularcategory of material application, it may be used in underground public areas on an unrestricted basis withinthe definition of that category.

3.2.5.2 Testing shall be undertaken by a suitably accredited test house. This shall be UKAS or itsinternational equivalent.

3.3 Compatibility with the Fire Precautions (Sub-Surface Stations) Regulations 19893.3.1 The Sub-Surface Regulations paragraph 8(1) has flammability requirements only for:

a) “ . . . any material which is used on or after 18 September 1989 in the construction of aninternal wall or ceiling in any part of the station premises to which members of the public haveaccess . . . ”

and

b) “ . . . any material which is applied on or after that date to the surface of an internal wall orceiling in such a part of the premises . . . ”

There are similar requirements for various parts of escalators in paragraphs 8(2) & 8(3).

3.3.2 The performance requirements in this standard also incorporate the requirements of the aboveRegulations and the additional requirements:

a) materials fire safety requirements for flooring and fittings materials in public areas;

b) materials fire safety requirements for materials installed in tunnels;

c) materials fire safety requirements for materials used in the construction of rolling stock;

d) Flammable gases, such as those emitted from batteries, and volatile liquids.




3.4 Evidence of complianceCompliance with the requirements of this standard shall be demonstrated to LUL by each party contracted toLUL. Additionally LUL may audit compliance as part of its surveillance regime.

4. ResponsibilitiesCED Surveillance Engineer shall be responsible for ensuring that a co-ordinated programme of audit andinspection is implemented to assure that compliance with this and other related standards is ensured.

Infrastructure companies, PFI Projects and LUL Contracts shall be responsible for maintaining their ownregisters of compliant products with design registrations and auditable trails relating to approvals.

The Chief Engineer, London Underground is responsible for :

a) the custodianship and quality of this standard, and for its programmed review;

b) ensuring that the content is appropriate and correct for the purposes of the standard;

c) Operation of the Waiver process, as described in P1042.

The LUL Procurement agent shall be responsible for incorporating the requirements of this engineeringstandard in any contract to which it is relevant and shall stipulate that a programme of audits areimplemented by the contractor which ensures that these requirements are complied with. This programmeand its results shall be available for verification by the CED Surveillance Engineer.

5. Supporting information

5.1 Background5.1.1 The requirements of this standard are separate from and independent of the fire resistance, fireprotection and fire prevention requirements of The Fire Precautions (Sub-Surface Railway Stations)Regulations 1989, excepting paragraphs 8(1), 8(2), 8(3) and 8(4). In particular, a materials installation thatcomplies with those Regulations need not necessarily comply with this standard - this is, in part, because theRegulations do not address the smoke and toxic fume emission requirements, which are covered in thisstandard.

5.1.2 The requirements of the Fire Precautions (Sub-Surface Railway Stations) Regulations 1989,paragraphs 8(1), 8(2), 8(3) and 8(4), are however incorporated into this standard where applicable.

5.1.3 The requirements and principles set out in this standard shall also be applied to all other locations asfar as reasonably practicable particularly underground , non-public, engineering and staff areas, includingadjacent premises (P2030). e.g. equipment rooms, mess rooms, control rooms, retail units etc.

5.2 Other supporting information

5.2.1 Materials categoriesThe performance requirement for assessing the fire safety of a material depends on the intended use; thetypes of usage are categorised as follows:




Table 1.1 - Performance Requirement Categories

Category Sub-category AbbreviationRolling Stock (interior) RS/-/-Tunnel (inc. exterior of rolling stock) TU/-/-

Location

Station ST/-/-Surface -/SU/-Seat -/SE/-Cable -/CA/-Flammable gas -/G/-

Usage

Equipment -/EQ/-Vertical (ie wall) -/-/vHorizontal, prone (ie ceiling) -/-/p

Disposition – Surface

Horizontal, supine (ie floor) -/-/sExtensive, grouped -/-/eLimited, dispersed -/-/lMinor use -/-/m

Disposition – Equipment

Encased -/-/c

Table 1.1 uses a different system than was used in M1042. Table 1.2 shows the equivalents of the oldcategories.

Table 1.2 - M1042 Equivalent Categories

Rolling stock Fixed locationsOld system New system Old system New systemI-I RS/SU/v I-I TU/SU/v or ST/SU/vI-ii RS/SU/p I-ii TU/SU/p or ST/SU/pI-iii RS/SU/s I-iii TU/SU/s or ST/SU/sII-I TU/SU/v I-iv *TU/SU/v,p,l or ST/SU/v,p,lII-ii TU/SU/p II ST/SEII-iii TU/SU/s III-I TU/EQ/e or ST/EQ/eIII *RS/SU/v,p,s III-ii TU/EQ/l or ST/EQ/lIV RS/SE IV TU/CA or ST/CAV RS/CAVI-I RS/EQ/eVI-ii RS/EQ/l* “Cavity surface” no longer exists as a separate categoryThe ‘encased’ designation had no counterpart in M1042




5.2.2 TestsThe tests applied to materials for flammability and smoke emission performance are all based on BritishStandards listed in clause 6.1.

The potential toxic fume emission performance is based upon the material's elemental composition, detailedin clause 5.2.3.

Tables 2.1, 2.2 and 2.3 below indicate which flammability and smoke emission tests are applied to eachmaterials category and the standard required for full compliance.

Table 2.1 Rolling Stock Test Programmes

Category Test procedure Performance requirement NotesRS/SU/v Table 2 (Interior vertical surfaces)

Table 5 (Exterior vertical surfaces)RS/SU/p Table 3 (Interior horizontal prone (ceiling) surfaces

Table 6 (Exterior horizontal prone (ceiling) surfacesRS/SU/s Table 1 (Interior supine (flooring) surfaces

Table 4 (Exterior supine (flooring) surfacesRS/SE Table 9 (Trim - back, base and assembly)

Table 10 (Shell – back and base)Table 11 (Textiles)

2,3

RS/CA

BS6853Category 1a

Table 13 (Interior cables)Table 14 (Exterior cables)

Table 2.2 Premises Test Programmes

Category Test procedure Performance requirement NotesEN13501-1or (BS476 Part 4)

Euroclass A1(Non-combustible)

6

EN13501-1or(BS 476: Part 6BS 476: Part 7)

Euroclasses B; do

(i1 < 6; I < 12

Class 1)

1

TU/SU/vTU/SU/p

BS 6853: AnnexD.8.4

Ao(ON) < 2.4m2/"burn area"

Ao(OFF) < 3.6m2/"burn area"EN13501-1or(BS 476: Part 6BS 476: Part 7)

Euroclasses B; do

(i1 < 6; I < 12

Class 1)

1TU/SU/s

BS 6853: AnnexD.8.6

Ao < 250m2/m2




Category Test procedure Performance requirement NotesBS4066 Part 3 Cat C Maximum height of charring above burner < 1.5m 11or BS ISO 4589-2 TI > 280°C or TI > 350°C, together with passing the Go

requirement, detailed below:4

TU/CAST/CA

BS EN 50268 Ao[ON] < 0.7[tan-1(d/45)/45 - tan-1(d)/2025]m2/burn length

Ao(OFF) < 1.8�Ao(ON)measured m2/"burn length"

Go < either Ao(ON)measured /10 m2/"burn length"/min

or Ao(ON)specified/20 m2/"burn length"/min whichever is greater

5

EN13501-1or (BS476 Part 4)

Euroclass A1(Non-combustible)

6


Euroclasses B; do

(i1 < 6; I < 12

Class 1)

1

ST/SU/vST/SU/p

BS 6853: AnnexD.8.4

Ao(ON) < 3.6m2/"burn area"

Ao(OFF) < 5.4m2/"burn area"


Euroclasses B; do

(i1 < 6; I < 12

Class 1)

1ST/SU/s

BS 6853: AnnexD.8.6

Ao < 350m2/m2


Euroclasses B; do

(i1 < 6; I < 12

Class 1)

1ST/SE

BS 6853: AnnexD.8.5

Ao < 14m2/"burn area" 3

Table 2.3 Test Programmes – Generic

Category Test procedure Performance requirement NotesBS 6853: App A (BSISO 4589-2)

TI > 350°C (LOI > 40) 8, 9-/EQ/e

BS 6853: AnnexD.8.3

AO � 0.005m2/g 9

BS 6853: App A (BSISO 4589-2)

TI > 300°C (LOI > 30) 8, 9-/EQ/l

BS 6853: AnnexD.8.3

AO � 0.02m2/g 9




Category Test procedure Performance requirement Notes-/EQ/c no specific test results required 7-/EQ/m no specific test results required-/G/- All flammable gases produced shall be adequately vented to avoid an explosive

build-up. 10

Notes on tables 2.1 – 2.3:

1) Test pieces in these tests shall reflect the nature of the installation as closely as possible andshould be considered to be tests on systems rather than individual components. In particular, forpaints, the substrate used in the test shall be the same or similar to the substrate in theinstallation, the number and nature of the coatings shall be the same and the thicknesses shall beequal or greater than those in the installation.

It is understood that the BS 476 tests require specimens that are essentially flat and that, incertain cases, it may not be possible to provide such specimens. In such situations, LUL willnormally accept ‘indicative’ results or those with a designated prefix (e.g. D) as detailed in theBritish Standard - prior agreement should be obtained from LUL in such cases.

When test pieces show abnormal behaviour during test, this will be indicated in the test report. Insome cases a suffix will be used in the test report (e.g. Class 1Y) - this should not be interpretedas being equivalent to a Class 1 result as it indicates gross abnormal behaviour (e.g. the samplemelting away from the heat source). In such instances, an assessment shall be made of thematerial in question and the environment in which it is to be used, and the data shall be availablefor audit purposes. Alternatively, the application in question may be referred to the WaiverCommittee.

2) The requirements for Category RS/SE are for the saloon seating; it is recommended that thedriver's seat need only meet the requirements for category ST/SE.

3) The seating tests should use as many components of the installed seat as is feasible in order tomake the test as realistic as possible.

4) For ‘standard-wall’ cable the TI is measured on the sheath only and shall be greater than 280°C;for ‘reduced-wall’ cable the TI is measured on the complete cable and shall be greater than 350°CThe definition of a ‘reduced-wall’ cable is where the radial thickness of the insulation is less than0.4mm. The flame travel down the sample shall not exceed 50mm, and shall not sustain longerthan 3 minutes at 280oC. At 350oC the flame travel down the sample shall not exceed 80mm.

5) The variable ‘d’ in the equation is the diameter of the cable in millimetres. Index G0 is the gradientof the smoke emission versus the time curve (during the ON phase).

A minimum of two tests shall be undertaken. If one result represents a marginal failure, a thirdtest shall be required to confirm the result.

6) Test need only be carried out on the substrate.

7) There are no specific test requirements for encased materials; instead it will be necessary to carryout an acceptable QRA procedure on any such assembly. The requirements of the QRA will bedetailed in the particular specification and is likely to refer to the implications of an internallygenerated fire as well as an external fire.

8) The preferred method is determination of the flammability temperature index (TI), but the limitingoxygen index (LOI) should be used where the behaviour of the material makes it unsuitable for TItesting. Materials with a softening point (ie glass transition temperature less than 280oC), and




which produce a low viscosity melt, should therefore be use the LOI.

9) The materials category for tubes, conduits, hoses, pipes and pipe insulation is -/EQ/-

10) Flammable gases (eg from batteries or volatile liquids that emit vapour) shall be adequatelyvented, and every installation shall be considered on a case-by-case basis by the WaiverCommittee.

11) Cables shall meet the same requirement as surfaces, with regard to burning drops, meetingEuroclass d0 to EN13501-1

5.2.3 Toxic fume emission requirements1 Evidence is required that materials do not contain amounts of chemical elements which could producesignificant amounts of toxic fumes in accordance with the standard stated in 8.4. This evidence should be inthe form of qualitative elemental analysis using X ray dispersive fluorescence (XRF) scanning microscopy.Low atomic weight elements should be detected using gas chromatography.

2 For unrestricted use of a material, covered by this standard, neither it nor its constituents shall havedeliberately incorporated by selection, addition or modification any significant amounts of organically boundhalogens, nitrogen, sulphur or phosphorus; typical chemical groups proscribed are:

a) C-X (where X = Halogen)

b) C-N

c) C-P

d) C-O-P

e) C-S

f) C-O-S

Trace levels of such chemical groups are acceptable - the criterion for “trace level” shall be that thesummation of the weight for weight percentage of the chemical group divided by the atomic weight for thegroup shall not exceed 0.015 %

i.e. � w w of Chemical GroupAtomic Weight of Group/ %

< 0.015

e.g. for a material with 0.1% Fluorine, 0.2% Chlorine and 0.3% Bromine, chemical groups

0119

0 2355

0 381

. ..

.� � = 0.0146

3 If a material contains such chemical groups, it will need to be demonstrated that combustion of the materialdoes not give rise to toxic fumes. This should be done by carrying out quantitative analysis of the material bya recognised analytical technique specifically for those chemical elements detected by the qualitativeanalytical method.

4 LUL reserve the right to exclude materials on the basis of toxic fume emission arising from elements orchemical groups, other than those specified above.




5.3 Safety considerationsFailure to meet the standards set in this document may mean that an installation does not meet therequirements of the Fire Precautions (Sub-Surface Railway Stations) Regulations 1989, paragraphs 8(1),8(2), 8(3) and 8(4).

6. Informative references

6.1 ReferencesReferences in the text are made to latest editions unless specific editions are cited. Where references aremade to other corporate engineering documents which are not yet published, existing documents shall befollowed until new documents have been authorised for use.

Note: References to particular EC Directives and Regulations, Acts of Parliament, Statutory Instrumentsor Common Law are made only if the subject demands them. Users of engineering standards are boundby all the relevant requirements of the law, regardless of whether or not there is any reference to them inthe standards.

Statutory documents

Ref No. TitleThe Fire Precautions (Sub-Surface Railway Stations) Regulations 1989

British Standards

Ref No. TitleBS 476 Part 4 Fire tests on building materials and structures: non-combustibility test for materialsBS 476 Part 6 Fire tests on building materials and structures: method of test for fire propagation for

materialsBS 476 Part 7 Fire tests on building materials and structures: method of classification of the surface

spread of flame of productsBS 4066 Part 3 Tests on electric cables under fire conditions: method for classification of flame

propagation characteristics of bunched cablesBS 4422 Part 1 British Standard Glossary of Terms associated with fire: General terms and

phenomena of fireBS 4422 Part 2 British Standard Glossary of Terms associated with fire: Structural fire protectionBS ISO 4589-2 Flammability temperature index/oxygen index test .BS 6853 Annex D Code of Practice for fire precautions in the design and construction of passenger

carrying trains. : three metre cube smoke emission test (various methods)BS EN 60529 Specification for degrees of protection provided by enclosures (IP Code)EN 13501 Part 1 Fire classification of construction products and building elements – part 1

classification using test data from reaction to fire tests.BS EN 50268 Common test methods for cables under fire conditions - measurement of smoke

density of cables under burning conditions.

LUL company documents

Ref No. Title2-05101-201 The Assessment and Management of HS&E Risk




2-05107-702 Audit2-05304-010 Concessions to Category 1, Mixed Category and Category 5 Standards

LUL engineering standards

Ref No. TitleE1006 Glossary of terms and abbreviations used in corporate engineering documentsE1045 Fire Safety Classification of StationsP2030 Prevention of fire spread from non-LUL properties into adjacent station areas.M1042 Code of Practice : Fire Safety of Materials used in the Underground

6.2 Abbreviations6.2.1 The following abbreviations are used within this document:

Abbreviation DefinitionLOI Limiting Oxygen IndexLUL London Underground LtdTI Flammability Temperature IndexUKAS United Kingdom Accreditation Service

6.2.2 Special abbreviations used within the engineering function are listed in E1006.

6.2.3 The following abbreviations from published sources are used in this document:

Abbreviation Definition Published sourceALARP As low as reasonably practicable Health and Safety at Work

Act - HASAWAIDLH Immediately Dangerous to Life or Health National Institute for

Occupational Safety andHealth - NIOSH PocketGuide to chemical hazards

LFEPA London Fire and Emergency Planning Authority

6.3 Definitions

6.3.1 The following terms are used within this document:

Term DefinitionEncased An ‘encased’ material is one that is completely encapsulated to IP65 (or better) to

BSEN60529 with a casing to EN13501-1 Euroclass A1 (or BS 476 Part 4) withall parts, such as gaskets, being non-combustible.

Flammability A general term meaning “the extent to which a material will burn with a flame”.General visibilitydistance (DG)

The distance from a light source at which objects, near to the observer, can justbe discerned.

IDLH level The maximum concentration of a chemical species in the atmosphere fromwhich, in the event of the lack or failure of a respirator, a person could escapewithin 30 minutes without experiencing any escape-impairing or irreversible




health effects.Specific visibilitydistance (DS)

The distance from a light source at which the light source can just be discerned.

Sub-surface regulations The Fire Precautions (Sub-Surface Railway Stations) Regulations 1989.Toxic fumes Any product of combustion that causes an escape-impairing or irreversible health

effect.Waiver (Material FirePerformance)

An authorised deviation from, or non-compliance with this standard, which is theLUL corporate engineering standard governing fire safety performance ofmaterial.

Waiver Committee The operation of the Waiver Committee is detailed in procedure P1042.

6.3.2 Terms used within the engineering function are defined in E1006.

6.3.3 The following definitions from published sources are used in this document:

Term Definition Published sourceFire compartment A building or part of a building, comprising one or more

rooms, spaces or storeys, constructed to prevent thespread of fire to or from another part of the same building,or an adjoining building

BS 4422: Part 2

Smoke Visible suspension in atmosphere of solid and/or liquidparticles resulting from combustion or pyrolysis

BS 4422: Part 1

Minor use materials where total mass and surface area do not exceed 100g or0.2m2 respectively, regardless of separation betweenmaterials.

Limited/dispersedmaterials

Where mass is greater than 100g and less than 500g, andwhere there is a separation of not less than 0.5m betweenmaterials.

Extensive/groupedmaterials

Where mass and separation exceed the definition oflimited/dispersed materials.




6.4 Document history

Edition Date ChangesR11 August 2003 Standard E1042 A6, re formatted and re-numbered to 2-01001-002, no

technical changes have been made to the content other than changingreferences to other Standards where their numbers have changed.

R12 October 2003 Revised following infraco commentsA1 December 2003 Authorised for use. Previous authorisation is valid

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