ASD-STAN PREN 3844-3-2018 Aerospace series Flammability of non-metallic materials Part 3 Small burner test 45 etermination of the resistance of material to flame and glow propagati.pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 3844-3 Edition P 2 March 2018 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Supersedes edition P

2、1 of January 1995 Descriptors: ENGLISH VERSION Aerospace series Flammability of non-metallic materials Part 3: Small burner test, 45 Determination of the resistance of material to flame and glow propagation and to flame penetration Luft- und Raumfahrt Entflammbarkeit nichtmetallischer Werkstoffe Tei

3、l 3: Kleinbrenner-Prfung, 45 Bestimmung der Bestndigkeit eines Materials gegen die Ausbreitung von Flammen und Glimmen und gegen Durchbrennen Srie arospatiale Inflammabilit des matriaux non mtalliques Partie 3 : Essai au brleur, 45 Dtermination de la rsistance du matriau la propagation de la flamme

4、et de lincandescence et la pntration de flammes This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been tec

5、hnically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. A

6、fter examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to impl

7、ement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. ASD-STAN Technical Committee approves that: “This document is published by ASD-STAN for the needs of the European Aerospace Industry. The use of this s

8、tandard is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN reviews each standard and technical report at least every five years at which time it may be revised, re

9、affirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying

10、, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1st March 2018 Comments should be sent within six months after the date of publication to ASD-STAN Material Domain C

11、opyright 2018 ASD-STAN prEN 3844-3:2018 (E) 2 Contents Page 1 Scope 3 2 Normative references 3 3 Terms and definitions . 3 4 Principle of method 4 5 Designation . 4 6 Test apparatus . 4 6.1 Test cabinet . 4 6.2 Specimen holder 5 6.3 Burner . 5 6.3.1 Burner type . 5 6.3.2 Burner fuel 5 6.3.3 Plumbing

12、 for gas supply . 5 6.3.4 Flame height indicator 5 6.3.5 Flame Temperature . 5 6.4 Timer . 5 7 Test specimens . 5 7.1 Number of specimens 5 7.2 Specimens size . 6 8 Conditioning 6 9 Burner adjustment . 6 10 Test procedure . 6 11 Test report . 7 Annex A (informative) Standard evolution form 13 Biblio

13、graphy 14 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Material Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3844-3

14、:2018 (E) 3 1 Scope This standard specifies the test for the determination of the resistance of non-metallic materials in part or in whole to flame and glow propagation and to flame penetration. This test method is also used for testing non-metallic materials which have to meet the test criteria for

15、 the 45 Bunsen burner test. It is used for evaluation of non-metallic materials or constructions used in the interiors of aerospace vehicles but also may be used in other applications as specified in applicable procurement and regulatory documents. This standard should be used to measure and describ

16、e 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, or assemblies under actual fire conditions. However, results of

17、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 The following documents are referred to in the text in such a way that some or all of their

18、content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ASTM-D 5025, Standard Specification for Laboratory Burner Used for Small-Scale Burning Te

19、sts on Plastic Materials 1) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online

20、 browsing platform: available at http:/www.iso.org/obp 3.1 time of flame application length of time 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 Note 1 to entry: Th

21、e time is expressed in seconds. 1) Published by: ASTM National (US) American Society for Testing and Materials http:/www.astm.org/. prEN 3844-3:2018 (E) 4 3.3 after glow time length of time in seconds for which the specimen continues to glow, without flaming combustion, after any flaming combustion

22、ceases following the removal of flame application Note 1 to entry: The time is expressed in seconds. 3.4 flame penetration flame penetration occurs if the Bunsen burner flame penetrates (passes through) the test specimen during the time of flame application Note 1 to entry: Flame penetration is defi

23、ned to have occurred if the burner flame passes through a hole or crack in the specimen that forms during the test. Flaming combustion on the top of the specimen that results from auto ignition is not considered flame penetration in this test. 4 Principle of method Testing is performed on a specimen

24、 that is held at an angle of 45 to the horizontal plane. A burner flame, having defined parameters, is applied to the specimen for a defined period of time. The after flame time, after removal of the burner flame, and the after glow time is measured. Flame penetration is reported. 5 Designation EXAM

25、PLE Description block 45 BUNSEN BURNER TEST Identity block EN3844-3 Number of this standard 6 Test apparatus 6.1 Test cabinet Tests shall be conducted in a draught-free cabinet, like shown in Figure 1 or other equivalent enclosures. Details and dimensions of a suitable test cabinet are given in Figu

26、re 2. Cabinets of bigger dimensions may be used if it has been proven that similar results are obtained. 1 mm thick metal sheet shall be used for the bottom surface of the cabinet. It is recommended to paint the entire inside back walls of the cabinet mat black to facilitate the viewing of the test

27、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. prEN 3844-3:2018 (E) 5 6.2 Specimen holder A specime

28、n holder shall be provided, such that the minimum exposed area of the specimen is 200 mm 200 mm. The specimen holder shall be fabricated of corrosion-resistant metal. 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

29、9,5 mm inside diameter barrel, and shall be equipped with 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. 6.3.2 Burner fuel Meth

30、ane 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 shall be essentially as specified in Figure 4. A control valve system with a delivery rate designed to f

31、urnish gas to the burner under a pressure of (17 2) kPa at the burner inlet shall be installed between the gas supply and the burner. 6.3.4 Flame height indicator There may be a flame height indicator spaced 25 mm from the burner barrel and extending above the burner, as shown in Figure 5. The indic

32、ator may 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 prong. The flame h

33、eight indicator may be removable. 6.3.5 Flame Temperature When the height is adjusted, measure the flame temperature with the help of a calibrated temperature measurement device and an allocated thermocouple (Type K, 1,5 mm). The tip of the thermocouple shall be completely in the flame. The flame te

34、mperature shall be at least 843 C. 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 the flame application and the after flame and after glow time. 7 Test specimens 7.1 Number of specimens At least three specimens

35、shall be prepared and tested. prEN 3844-3:2018 (E) 6 7.2 Specimens size The specimen shall be a square of at least 220 mm 220 mm. 8 Conditioning Condition 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 immed

36、iately before being tested. 9 Burner adjustment a) Assure that the air supply to the burner is shut off. b) Open the stopcock in the gas line fully. c) Light the burner. d) Adjust the gas flowrate to produce a flame height of 38 mm. 10 Test procedure Make sure that the test cabinet is essentially dr

37、aught free. Assure that the specimen is mounted in the frame, so that the edges are held securely. The exposed surface of the specimen, defined in the test specification shall be faced down. Place the burner at least 76 mm away from where the specimen will be located during the test. Insert the spec

38、imen into the test position. Close the cabinet door, and keep it closed during the test. Place the burner, so that the centre of the burner barrel is under and 25 mm away from the centre of the exposed surface of the specimen, see Figure 6. Start the timer as soon as the burner is in test position.

39、Apply the flame for 30 s, then withdraw the burner by moving the burner into start position. Determine the after flame time and the after glow time for the specimen to the nearest 0,2 s. Determine whether flame penetration occurred. After both flaming and glowing have ceased: a) open the cabinet doo

40、r slowly to clear the test cabinet of fumes and smoke; b) remove the specimen. 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. prEN 3844-3:2018 (E) 7 11 Test report The test report shall i

41、nclude the following data: a) description of the specimen; b) manufacturer/supplier; c) designation of the test method; d) the after flame time for each specimen tested and the average value; e) the after glow time for each specimen tested to the nearest 0,2 s and the average value; f) a statement i

42、f flame penetration occurred; g) 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; h) changes in test procedure required by the test specification; i) nam

43、e and address of the test laboratory/organisation; j) date of testing; k) operators name and signature. prEN 3844-3:2018 (E) 8 Figure 1 Draught-free cabinet prEN 3844-3:2018 (E) 9 Dimensions in millimetres Figure 2 Details and dimensions prEN 3844-3:2018 (E) 10 Dimensions in millimetres Figure 3 Spe

44、cimen holder prEN 3844-3:2018 (E) 11 Key 1 flowmeter (optional) 4 needle valve 2 hose 5 pressure-gauge valve 3 burner Figure 4 Pluming of gas supply Dimensions in millimetres Key 1 burner Figure 5 Flame height indicator prEN 3844-3:2018 (E) 12 Dimensions in millimetres Key 1 specimen holder (top) 2

45、specimen 3 specimen holder (bottom) 4 burner orifice Figure 6 Flame position the specimen prEN 3844-3:2018 (E) 13 Annex A (informative) Standard evolution form The main changes with respect to the previous edition are listed in Table A.1. Table A.1 Main changes to previous edition prEN/EN Number Edi

46、tion Publication Date Modification Reason and validation prEN 3844-3 P1 01/1995 Deleteion of “ Each of the rectangular frames shall be at least 2 mm in thickness“ from 6.2 specimen holder Alignment with FAA Fire Testing Handbook Flame height indicator in 6.3.4 is a recommendation and not mandatory a

47、nymore Alignment with FAA Fire Testing Handbook Change Condition specimens to (21 3) C in Clause 8 Alignment with FAA Fire Testing Handbook Modification of the Test report in Clause 12 Alignment with FAA Fire Testing Handbook prEN 3844-3:2018 (E) 14 Bibliography For the preparation of this standard,

48、 the following documents were used: 1 FAR Part 25 Section 25.855, Federal Aviation Administration Part 25 - Airworthiness Standards: Transport Category Airplanes - Fire Protection Sec 25.853 Compartment interiors 2 FAR Part 25 Appendix F Part 1 Paragraph (a) (2) (6), 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. 2) Cargo and baggage compartment not occupied by crew or passengers (III) 6) Forty-five degree test