1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3844-1:2011Aerospace series Flammability of non metallic materialsPart 1: Small burner test, vertical Determination of the vertical flame propagationBS EN 3844-1:2011 BRITI
2、SH STANDARDNational forewordThis British Standard is the UK implementation of EN 3844-1:2011. The UK participation in its preparation was entrusted to T e c h n i c a l Committee ACE/65, Non-metallic materials for aerospace purposes (excluding textiles).A list of organizations represented on this co
3、mmittee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 73879 1 ICS 49.025.15 Compliance with a British Standard cannot confer immunity from
4、 legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2011.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 3844-1:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3844-1 November 2011 ICS
5、49.025.15 English Version Aerospace series - Flammability of non metallic materials - Part 1: Small burner test, vertical - Determination of the vertical flame propagation Srie arospatiale - Inflammabilit des matriaux non mtalliques - Partie 1: Essai au brleur, vertical - Dtermination de la propagat
6、ion verticale de la flamme Luft- und Raumfahrt - Entflammbarkeit nichtmetallischer Werkstoffe - Teil 1: Kleinbrenner-Prfung, senkrecht - Bestimmung der senkrechten Flammenausbreitung This European Standard was approved by CEN on 10 March 2011. CEN members are bound to comply with the CEN/CENELEC Int
7、ernal Regulations 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 an
8、y CEN member. 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 v
9、ersions. 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,
10、 Slovenia, 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
11、CEN national Members. Ref. No. EN 3844-1:2011: EBS EN 3844-1:2011 EN 3844-1:2011 (E) 2 Contents Foreword . . 31Scope . . 42Normative references . . 43Terms and definitions . . 44Principle of method . 55Designation . . 56Test apparatus . 57Test specimens . . 68Conditioning . 79Burner adjustment . 710
12、Test procedure . 711Report. . 8Bibliography . . 16BS EN 3844-1:2011 EN 3844-1:2011 (E) 3 Foreword This document (EN 3844-1:2011) 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
13、rules 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 t
14、ext or 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 fo
15、r identifying 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, Franc
16、e, Germany, 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 3844-1:2011 EN 3844-1:2011 (E) 4 1 Scope This European Standard specifies the test
17、method for the determination of the vertical flame propagation and after flame time of non metallic materials. This test method is also used for testing non metallic materials which have to meet the test criteria for the vertical Bunsen burner test: with a flame application time of 60 s; with a flam
18、e application time of 12 s. It is used for evaluation of non metallic 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
19、 properties of non metallic materials, products or assemblies in response 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
20、test may be used as elements of a fire risk assessment which takes into 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 da
21、ted references, only the edition cited applies. For undated references, 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 docume
22、nt, the following terms and definitions apply. 3.1 time of flame application length of time for which the burner flame is applied to the specimen 3.2 after flame time time in seconds for which the specimen continues to flame after the burner flame has been removed from the specimen 3.3 after flame t
23、ime of drips time in seconds that any flaming material continues to flame after falling from the specimen to the bottom of the chamber 1) Published by: ASTM National (US) American Society for Testing and Materials http:/www.astm.org/. BS EN 3844-1:2011 EN 3844-1:2011 (E) 5 3.4 burn length distance i
24、n 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 areas where material has shrunk
25、or melted away from the heat 4 Principle of method Testing is performed on a specimen that is held vertical. 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 occurrence of drips and their aft
26、er flame time is measured. 5 Designation EXAMPLE Description block VERTICAL BUNSEN BURNER TEST Identity block EN3844-1A Number of this standard Code for flame application time (see Table 1) Table 1 Time of flame application s Code60 A 12 B 6 Test apparatus 6.1 Test cabinet Tests shall be conducted i
27、n a draught-free cabinet, like shown in Figure 1. Details and dimensions of the test cabinet are given in Figure 2. 1 mm thick metal sheet shall be used for the bottom surface of the cabinet. It is recommended to paint the entire inside back wall of the cabinet mat black to facilitate the viewing of
28、 the test specimen. A mirror may be located on the inside back surface to facilitate observation of the hidden surface. It is suggested that the cabinet be located inside an exhaust hood to facilitate clearing the cabinet of smoke and fumes after each test. Cabinets of bigger dimensions may be used
29、if it has been proven that similar results are obtained. BS EN 3844-1:2011 EN 3844-1:2011 (E) 6 6.2 Specimen holder A specimen holder shall be provided, such that the exposed area of the specimen is 50 mm 305 mm. An example for a construction is given in Figure 3. The specimen holder shall be fabric
30、ated of corrosion-resistant metal. A comb can be used for testing of small items, which cannot be mounted in the specimen holder, see Figure 4. 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 valve to
31、 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. 6.3.2 Burner fuel Bottled methane gas shall be used as burner fuel. Natural gas is also acceptabl
32、e if it contains more than 90 % methane. 6.3.3 Plumbing for gas supply The necessary gas connections and the applicable plumbing are shown in Figure 5. A control valve system with a delivery rate designed to furnish gas to the burner under a pressure of at least 5 kPa at the burner inlet shall be in
33、stalled 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 6. The indicator shall have two prongs, 8 mm in length, marking the distances, 22 mm and 38 mm ab
34、ove 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 shall be removable. 6.4 Timer One or more stop-watches or other tim
35、ers, calibrated and graduated to the nearest 0,1 s, shall be used to measure the time of the flame application, the after flame time and the after flame time of drips. 6.5 Ruler A ruler or a scale, calibrated and graduated to the nearest 1 mm, shall be used to measure the burn length. 7 Test specime
36、ns 7.1 Number of specimens At least three specimens shall be prepared and tested. BS EN 3844-1:2011 EN 3844-1:2011 (E) 7 7.2 Specimens orientation For materials which may have anisotropic flammability properties (i.e. different properties in different directions, such as machine and cross-machine di
37、rection for extruded materials, 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 size The specimens shall be a rectangle of at least 75 mm 305 mm. 8 Conditioning Conditi
38、on specimens at (23 2) C and at (50 5) % relative humidity for min. 24 h. Remove only one specimen at a 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
39、 burner. Adjust the gas flowrate to produce a flame height of 38 mm. 10 Test procedure Make sure that the 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. On
40、e short edge of the specimen has to be flush with the open end of the specimen holder. Insert the specimen holder into the cabinet and assure that the vertical distance between the burner orifice and the bottom surface of the specimen is 19 mm (see Figure 7). Make sure of the verticality of the spec
41、imen. Close the cabinet door, and keep it closed during the test. Place the burner in test position. Start the timer as soon as the burner is in test position. If not otherwise defined in the customers specification the test position is defined as follows: The burner is positioned under the specimen
42、 such that the flame impinges on the midpoint of the lower edge of the test side, defined in the test specification (see Figure 7). Depending on the customers specification apply the flame for 12 s or 60 s and then withdraw it by moving the burner approximately 76 mm away from the test position. BS
43、EN 3844-1:2011 EN 3844-1:2011 (E) 8 If flaming material falls from the test specimen, record the after flame time of drips for the specimen to the nearest 1 s. Determine the after flame time and the after glow time for the specimen to the nearest 1 s. After all flaming and glowing have ceased, open
44、the cabinet door slowly to clear the test cabinet of fumes and smoke. After both flaming and glowing have ceased remove the specimen and determine the burn length to the nearest 1 mm. To facilitate determining the burn length, a moderate solvent that does not dissolve or attack the specimen material
45、 may be used to remove soot and stained particles from tested specimen. In some cases it might be helpful to cut the specimen in order to determine the burn length. Remove any material from the bottom of the cabinet that fell from the specimen. If necessary, clean the test cabinet window prior to te
46、sting the next specimen. 11 Report The test report shall include the following data: complete description of the specimen material and specimen construction (material designation, manufacturers identification, manufacturing number, construction, specimen, thickness, density, etc.); manufacturer/supp
47、lier and order number; statement of conformity given by the quality assurance of specimen manufacturer; designation of the test method; position of the Bunsen burner flame; after flame time for each specimen tested and the average value; after flame time of drips for each specimen tested and the ave
48、rage value; NOTE If no material falls from the specimen, the after flame time of drips is 0 s, and “No drip“ is also reported. If there is more than one drip, the after flame time of drips reported is that of the longest flaming drip. If succeeding flaming drips reignite drips that flamed earlier, t
49、he after flame time of drips reported is the total of all flaming drips. burn length for each specimen tested and the average value; 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/organizati
