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 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with A
8、ECMANot for ResaleNo reproduction or networking permitted without license from IHS-,- STD.AECMA PREN 3844-1-ENGL 1775 = LO12311 001LY37 83b Page 2 prEN 3844-1 : 1995 Foreword This standard is divided in three parts (EN 3844-1 , 3844-2, 3844-3). EN 3844-1 and EN 3844-2 are intended to replace EN 2310
9、 when they are adopted as European Standards. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-STD*AECMA PREN 384q-L-ENGL 1795 M 303231L 0033438 772 = Pag
10、e 3 prEN 3844-1 : 1995 I Scope This standard specifies the test 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
11、 burner test : - with a flame application time of 60 s ; - with a flame 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 regulat
12、ory documents. This standard should be used to measure and describe the 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
13、, or assemblies under actual fire conditions. However results of this 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 This European Standard inco
14、rporates by dated or undated reference provisions from other publications. These normative 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 Euro
15、pean Standard only when incorporated in it by amendment or revision. For undated references 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 foll
16、owing definitions apply : Time of flame application : Time of flame application is the length 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 fr
17、om the specimen. After flame time of drips : After flame time of drips is the time in seconds 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 far
18、thest 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 discolored, nor areas where material has shrunk or melted away from the heat. 4 Principle of method Test
19、ing 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 after flame time is measured. 1) Published by : American S
20、ociety for Testing and Materials (ASTM), 1916 Race Street, Philadelphia, PA 19103 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-STD.AECMA PREN 38qq-L-E
21、NGL 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 Test apparatus
22、 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 wall of the cabi
23、net 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 after each test.
24、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 holder shall be f
25、abricated 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 val
26、ve 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. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS un
27、der license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,- STDmAECMA PREN 384i-L-ENGL 1775 = 10L2311 OOL1440 320 = Page 5 prEN 3844-1 : 1995 6.3.2 Burner fuel Bottled methane gas shall be used as burner fuel. Natural gas is also acceptable if it contains
28、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 installed between t
29、he 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 above the top of th
30、e 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 timers, calibrated a
31、nd 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, calibrated and graduated to the nearest 1 mm, shall be used to measure the burn length. 7 Test specimens 7.1 Number of
32、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 in different directions, such as machine and cross-machine direction for extruded materials, warp and weft for woven
33、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 x 305 mm. 8 Conditioning Condition specimens at (23 f 2) OC and at (50 k 5) % relative
34、 humidity for min. 24 h. Remove only one specimen at a time from the conditioning environment immediately before being tested. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted witho
35、ut license from IHS-,-STD-AECMA PREN 3844-1-ENGL 1775 1012311 00114LiL 2b7 Page 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.
36、 10 Test procedure Make sure that the test cabinet is essentially draft 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
37、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 specimen. Close the cabinet door, and keep it closed during the test. Plac
38、e 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 such that the flame impinges on the midpoint of the lower edge of th
39、e 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. If flaming material falls from the test specimen, record the after flame
40、 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 the cabinet door slowly to clear the test cabinet of fumes and smoke. After both flaming and glowing have ce
41、ased 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 may be used to remove soot and stained particles from tested specimen. In some cases it might be helpful to
42、 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 testing the next specimen. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided
43、by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-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 (material designation, manu
44、facturers 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 of the Bunsen burner flame
45、; - 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 is more than one drip, the
46、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 ; - specimen orientation (if
47、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
48、the test laboratory/organization ; - date of testing ; - operators name and signature of the responsible engineer. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license f
49、rom IHS-,-STD.AECMA PREN 384q-L-ENGL 1775 LOI12311 OOLLLi43 03T W Page 8 prEN 3844-1 : 1995 Figure 1 : Draft-free cabinet Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-Page 9 prEN 3844-1 : 1995 Dimensions in millimetres C +I C c
