1、 STD-AECMA PREN 3844-1-ENGL 1995 W LOL23L1 OOLLLi3b 9TT AECMA STANDARD NORME AECMA AECMA NORM prEN 3844-1 Edition P 1 January 1995 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.9
2、8.76 UDC : Descriptors : ENGLISH VERSION Aerospace series Flammability of non metallic materials Determination of the vertical flame propagation Part 1 : Small burner test, vertical Srie arospatiale Luft- und Raumfahrt Partie 1 : Essai au brleur, vertical Inflammabilit des matriaux non mtalliques Dt
3、ermination de la propagation Entflammbarkeit nicht metallischer Werkstoffe Teil 1 : Kleinbrenner - Prfung, senkrecht Bestimmung der senkrechten verticale de la flamme Flammenausbreitung This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des
4、 Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical conte
5、nt shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will b
6、e submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Comments should be sent within six months after the date of p
7、ublication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE Edition approved for publication 1 995-0 1 -3 1 C7 Chairman Mr Bottrell aecrna 199 STD.AECMA PREN 3844-1-ENGL 1775 = LO12311 001LY37 83b Page 2 prEN 3844-1 : 1995 Foreword This standard is divi
8、ded in three parts (EN 3844-1 , 3844-2, 3844-3). EN 3844-1 and EN 3844-2 are intended to replace EN 2310 when they are adopted as European Standards. STD*AECMA PREN 384q-L-ENGL 1795 M 303231L 0033438 772 = Page 3 prEN 3844-1 : 1995 I Scope This standard specifies the test method for the determinatio
9、n 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 flame application time of
10、 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 properties of non m
11、etallic 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 test may be used as e
12、lements 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 This European Standard incorporates by dated or undated reference provisions from other publications. These normative
13、references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references
14、 the latest edition of the publication referred to applies. ASTM-D 5025 “A laboratory burner used for small-scale burning test on plastic materials“ 1) 3 Definitions For the purposes of this standard, the following definitions apply : Time of flame application : Time of flame application is the leng
15、th of time for which the burner flame is applied to the specimen. After flame time : After flame time is the time in seconds for which the specimen continues to flame after the burner flame has been removed from the specimen. After flame time of drips : After flame time of drips is the time in secon
16、ds that any flaming material continues to flame after falling from the specimen to the bottom of the chamber. Burn length : Burn length is the 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
17、 of partial consumption, charring, or embrittlement, but not including, areas sooted, stained, warped or discolored, nor areas where material has shrunk 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 parame
18、ters, 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 after flame time is measured. 1) Published by : American Society for Testing and Materials (ASTM), 1916 Race Street, Philadelphia, PA 19103 STD.AECMA
19、 PREN 38qq-L-ENGL 1775 m LOI12311 CI013437 b07 Time of flame application 60 s 12 s Page 4 prEN 3844-1 : 1995 Code A B 5 Designation EXAMPLE : Description block I Identity block VERTICAL BUNSEN BURNER TEST I EN3844-IA IT Number of this standard Code for flame application time (see table 1) Table 1 6
20、Test apparatus 6.1 Test cabinet Tests shall be conducted in a draft-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 wa
21、ll of the cabinet mat black to facilitate the viewing of 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 aft
22、er each test. Cabinets of bigger dimensions may be used if it has been proven that similar results are obtained. 6.2 Specimen holder A specimen holder shall be provided, such that the exposed area of the specimen is 50 mm x 305 mm. An example for a construction is given in figure 3. The specimen hol
23、der shall be fabricated 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 wit
24、h a needle valve 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. STDmAECMA PREN 384i-L-ENGL 1775 = 10L2311 OOL1440 320 = Page 5 prEN 3844-1 : 1
25、995 6.3.2 Burner fuel Bottled methane gas shall be used as 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 are shown in figure 5. A control valve system with a delivery rate des
26、igned to furnish gas to the burner 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 fig
27、ure 6. The indicator shall have two 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
28、prong. The flame height indicator shall be removable. 6.4 Timer One or more stop-watches or other timers, calibrated and graduated to the nearest 0,l 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, c
29、alibrated and graduated to the nearest 1 mm, shall be used to measure the burn length. 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 (.e., different properties
30、 in different directions, such as machine and cross-machine direction 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 b
31、e a rectangle of at least 75 mm x 305 mm. 8 Conditioning Condition specimens at (23 f 2) OC and at (50 k 5) % relative humidity for min. 24 h. Remove only one specimen at a time from the conditioning environment immediately before being tested. STD-AECMA PREN 3844-1-ENGL 1775 1012311 00114LiL 2b7 Pa
32、ge 6 prEN 3844-1 : 1995 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 the test cabinet is essentially draft free.
33、 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. Insert the specimen holder into the cabinet and assure that
34、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 specimen. 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 te
35、st position. If not otherwise defined in the customers specification the test position is defined as follows : The burner is positioned under the specimen 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 t
36、he 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. 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
37、 time and the after glow time for the specimen to the nearest 1 s. After all flaming and glowing have ceased, open 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. T
38、o facilitate determining the burn length, a moderate solvent that does not dissolve or attack the specimen material 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
39、from the bottom of the cabinet that fell from the specimen. If necessary, clean the test cabinet window prior to testing the next specimen. Page 7 prEN 3844-1 : 1995 11 Report The test report shall include the following data : - complete description of the specimen material and specimen construction
40、 (material designation, manufacturers identification, manufacturing 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 ; - position
41、 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 average value ; NOTE : If no material falls from the specimen, the after flame time of drips is O s, and “No drip” is also reported. If there
42、 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, the after flame time of drips reported is the total of all flaming drips. - burn length for each specimen tested and the average value ;
43、 - 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 specificat
44、ion ; - name and address of the test laboratory/organization ; - date of testing ; - operators name and signature of the responsible engineer. STD.AECMA PREN 384q-L-ENGL 1775 LOI12311 OOLLLi43 03T W Page 8 prEN 3844-1 : 1995 Figure 1 : Draft-free cabinet Page 9 prEN 3844-1 : 1995 Dimensions in milli
45、metres C +I C c t- 7 u=+ 315 110 a I D 4 -4- Ln F t I 20 4 3 330+ 10 c 3 20 4- Figure 2 : Details and dimensions STD-AECMA PREN 3844-L-ENGL 1995 10121LL 0011445 902 Page 10 prEN 3844-1 : 1995 Dimensions in millimetres 305 250 I I -iL b -t Figure 3 : Specimen holder Page 11 prEN 3844-1 : 1995 Dimensi
46、ons in millimetres Y Figure 4 : Comb STD-AECMA PREN 3844-1-ENGL 1775 W LO12311 001L447 785 Page 12 prEN 3844-1 : 1995 Pressure-gauge valve Q - Flowmeter (optional) P / Needle valve Figure 5 : Plumbing of gas supply Dimensions in millimetres Burner Figure 6 : Flame height indicator Page 13 prEN 3844-
47、1 : 1995 Dimensions in millimetres Test side I $1 I I Figure 7 : Flame position on the specimen Page 14 prEN 3844-1 : 1995 Annex A (informative) Bibliography For the preparation of this standard, the following documents were used. FAR Part 25 Section 25.853 Federal Aviation Administration Part 25 -
48、Airworthiness Standards : Transport Category Airplanes - Fire Protection Sec 25.853 Compartment interiors FAR Part 25 Appendix F Part 1 Paragraph (a) (1) (3) and (4) Federal Aviation Administration - Appendix F to Part 25 Part 1 : Test criteria and procedures for showing compliance with 25.853 or 25.855 (a) Material test criteria 1) Interior compartments occupied by crew or passengers 2) Apparatus 3) Vertical test
