1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3844-2:2011Aerospace series Flammability of non metallicmaterialsPart 2: Small burner test, horizontal Determination of the horizontal flamepropagationBS EN 3844-2:2011 BRI
2、TISH STANDARDNational forewordThis British Standard is the UK implementation of EN 3844-2:2011.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/65, Non-metallic materials for aerospace purposes(excluding textiles).A list of organizations represented on this committee c
3、an beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 73880 7ICS 13.220.40; 49.025.99Compliance with a British Standard cannot confer immunity fromlega
4、l obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2011.Amendments issued since publicationDate Text affectedBS EN 3844-2:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3844-2 November 2011 ICS 49.025.15 Englis
5、h Version Aerospace series - Flammability of non metallic materials - Part 2: Small burner test, horizontal - Determination of the horizontal flame propagation Srie arospatiale - Inflammabilit des matriaux non mtalliques - Partie 2: Essai au brleur, horizontal - Dtermination de la propagation horizo
6、ntale de la flammeLuft- und Raumfahrt - Entflammbarkeit nichtmetallischer Werkstoffe - Teil 2: Kleinbrenner-Prfung, waagerecht - Bestimmung der waagerechten Flammenausbreitung This European Standard was approved by CEN on 10 March 2011. CEN members are bound to comply with the CEN/CENELEC Internal R
7、egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN m
8、ember. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions
9、. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Sloven
10、ia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nat
11、ional Members. Ref. No. EN 3844-2:2011: EBS EN 3844-2:2011EN 3844-2:2011 (E) 2 Contents Foreword . 31 Scope . 42 Normative references . 43 Terms and definitions . 44 Principle of method 45 Designation . 56 Test apparatus 57 Test specimens . 68 Conditioning 79 Burner adjustment 710 Test procedure 711
12、 Calculation . 812 Report. 8Bibliography . 15BS EN 3844-2:2011EN 3844-2:2011 (E) 3 Foreword This document (EN 3844-2:2011) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules
13、of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or
14、 by endorsement, at the latest by May 2012, and conflicting national standards shall be withdrawn at the latest by May 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for iden
15、tifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Ger
16、many, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3844-2:2011EN 3844-2:2011 (E) 4 1 Scope This European Standard specifies the test method
17、for the determination of the horizontal flame propagation of non metallic materials when subjected to a small flame. This test method is also used for testing non metallic materials which have to meet the test criteria for the horizontal Bunsen burner test. It is used for evaluation of non metallic
18、materials or constructions used in the interiors of aerospace vehicles but may be used in other applications as specified in applicable procurement and regulatory documents. This standard should be used to measure and describe the properties of non metallic materials, products or assemblies in respo
19、nse to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However results of this test may be used as elements of a fire risk assessment which takes into
20、 account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references,
21、 the latest edition of the referenced document (including any amendments) applies. ASTM-D 5025, A laboratory burner used for small-scale burning test on plastic materials 1) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 flame spread rate di
22、stance travelled by a flame front during its propagation, per unit time, under specified test conditions NOTE In this test, it is the speed with which a flame front moves across a test specimen mounted horizontally. 3.2 time of flame application length of time the burner flame is applied to the spec
23、imen 3.2 burn length distance in millimetres from the original specimen edge to the farthest evidence of damage of the test specimen due to that areas combustion, including areas of partial consumption, charring, or embrittlement, but not including areas sooted, stained, warped or discoloured, nor a
24、reas where material has shrunk or melted away from the heat 4 Principle of method Testing is performed on a specimen that is held horizontal. A burner flame, having defined parameters, is applied to the specimen for a defined period of time. The after flame time and the burn length is measured. The
25、occurrence of drips and their after flame time is measured. 1) Published by: ASTM National (US) American Society for Testing and Materials http:/www.astm.org/. BS EN 3844-2:2011EN 3844-2:2011 (E) 5 5 Designation EXAMPLE Description block HORIZONTAL BUNSEN BURNER TEST Identity block EN3844-2 Number o
26、f this standard 6 Test apparatus 6.1 Test cabinet Tests shall be conducted in a draught-free cabinet, as shown in Figure 1. Details and dimensions of the test cabinet are given in Figure 2. The cabinet shall have a removable cover which either contains a pyrex observation window with a 8,5 mm wide v
27、entilating clearance all around, 50 mm away from the edges, or 28 equally spaced, 12,5 mm ventilating holes distributed over the cover evenly. 1 mm thick metal sheet shall be used for the bottom surface and the cabinet shall have six equally spaced 12,5 mm ventilating holes along each side, placed 4
28、5 mm above the lower end of the side wall. It is recommended to paint the entire inside back walls of the cabinet mat black to facilitate the viewing of the test specimen. Cabinets of larger dimensions may be used if it has been proven that similar results are obtained. It is suggested that the cabi
29、net be located inside an exhaust hood for clearing the cabinet of smoke and fumes after each test. 6.2 Specimen holder The specimen holder shall be fabricated of corrosion-resistant metal. A specimen holder shall be provided, such that the exposed area of the specimen is 50 mm 305 mm. An example for
30、 a construction is given in Figure 3. Each of the rectangular frames must be 6,5 mm in thickness. An example for a construction is given in Figure 3. 6.3 Burner 6.3.1 Burner type The burner shall be a Bunsen or Tirril type, have a 9,5 mm inside diameter barrel, and shall be equipped with a needle va
31、lve to adjust the gas flow rate and thereby adjust the flame height. The burner shall have no air supplied either directly or by aspiration. The Bunsen burner defined in ASTM-D 5025 has been found acceptable. BS EN 3844-2:2011EN 3844-2:2011 (E) 6 6.3.2 Burner fuel Bottled methane gas shall be used a
32、s burner fuel. Natural gas is also acceptable if it contains more than 90 % methane. 6.3.3 Plumbing for gas supply The necessary gas connections and the applicable plumbing shall be essentially as specified in Figure 4. A control valve system with a delivery rate designed to furnish gas to the burne
33、r under a pressure of at least 5 kPa at the burner inlet shall be installed between the gas supply and the burner. 6.3.4 Flame height indicator There shall be a flame height indicator spaced 25 mm from the burner barrel and extending above the burner, as shown in Figure 5. The indicator shall have t
34、wo prongs, 8 mm in length, marking the distances, 22 mm and 38 mm above the top of the burner. When the flame is properly adjusted, then the tip of the flame shall be at the 38 mm prong and for pure methane the tip of the inner cone of the flame will be at the 22 mm prong. The flame height indicator
35、 shall be removable. 6.4 Timer One or more stop-watches or other timers, calibrated and graduated to the nearest 0,1 s, shall be used to measure the time of flame application and the time of the specimen burning. 6.5 Ruler A ruler or a scale, calibrated and graduated to the nearest 1 mm, shall be us
36、ed to measure the burn length and for specimen preparation. 7 Test specimens 7.1 Number of specimens At least three specimens shall be prepared and tested. 7.2 Specimens orientation For materials which may have anisotropic flammability properties (i.e. different properties in different directions, s
37、uch as machine and cross-machine direction for extrusions, warp and weft for woven fabrics, etc.), the specimens shall be tested in both directions. The values for every direction have to be averaged and reported separately. 7.3 Specimens preparation The specimens shall be a rectangle of at least 75
38、 mm 305 mm. 7.4 Specimens size Mark gauge lines on the back surface (opposite the exposed surface) of the specimen as shown in Figure 6. BS EN 3844-2:2011EN 3844-2:2011 (E) 7 8 Conditioning Condition specimens at (23 2) C and at (50 5) % relative humidity for min. 24 h. Remove only one specimen at a
39、 time from the conditioning environment immediately before being tested. 9 Burner adjustment Assure that the air supply to the burner is shut off. Open the stopcock in the gas line fully. Light the burner. Adjust the gas flowrate to produce a flame height of 38 mm. 10 Test procedure Make sure that t
40、he test cabinet is essentially draught free. Place the burner at least 76 mm away from the test position. Mount the specimen into the specimen holder so that the clamped edges are held securely. One short edge of the specimen has to be flush with the open end of the specimen holder. The exposed surf
41、ace of the specimen, defined in the test specification shall be face down. Insert the holder with the specimen into the cabinet. Close the cabinet door, and keep it closed during the test. Assure that the lower edge of the specimen is 19 mm above the level of the top of the burner. Start the timer a
42、s soon as the burner is in test position. Apply the flame for 15 s, then withdraw the burner by moving the burner into start position. Note the times and/or locations on the specimen at which the following events occur: if the flame front crosses the 38 mm gauge line, note the elapsed time in second
43、s, t38, at which the crossing occurs; if the flame front crosses the 292 mm gauge line, note the elapsed time in seconds, t292, at which the crossing occurs; if the specimen burns very slowly so that the flame front does not reach the 292 mm gauge line within 5 min or if the flame extinguishes befor
44、e reaching the 292 mm gauge line, the total burn length in millimetres and the elapsed time in seconds may be noted and the test terminated. After all flaming ceases, open the cabinet door slowly to clear the test cabinet of fumes and smoke. Remove any material from the bottom of the cabinet that fe
45、ll from the specimen. If necessary, clean the test cabinet window prior to testing the next specimen. BS EN 3844-2:2011EN 3844-2:2011 (E) 8 11 Calculation Depending on the burning behaviour of the material calculate the flame spread rate as follows: a) if the flame front self-extinguished before cro
46、ssing the 292 mm gauge line: no calculation, record the flame spread rate as 0; b) if the most advanced part of the flame front reached the 292 mm gauge line calculate as follows: flame spread rate mm/min = () s)(s/min60mm38 29238292tt ; c) if the specimen burnt very slowly so that the flame front d
47、oes not reach the 292 mm gauge line within 5 min: no calculation, record the burn length in millimetres. 12 Report The test report shall include the following data: complete description of the specimen material and specimen construction (material designation, manufacturers identification, manufactur
48、ing number, construction, specimen thickness, density, etc.); manufacturer/supplier and order number; statement of conformity given by the quality assurance of specimen manufacturer; designation of the test method; flame spread rate for each specimen tested and the average value; burn length for eac
49、h specimen tested; specimen orientation (if applicable); observations about melting, sagging, delamination, or other behaviour that affected the exposed surface area or mode of burning occurred, and the time in seconds at which such behaviour occurred; changes in test procedure required by the test specification; name and address of the test laboratory/organisation; date of testing; operators name and signature of the responsible engineer. BS EN 3844-2:2011EN
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