ASD-STAN PREN 3844-2-2018 Aerospace series Flammability of non-metallic materials Part 2 Small burner test horizontal Determination of the horizontal flame propagation (Edition P 2.pdf

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1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 3844-2 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 and will supersede EN 3844-2:2011 Descriptors: ENGLISH VERSION Aerospace series Flammability of non-metallic materials Part 2: Small burner test, horizontal Determination of the horizontal flame propagation Luft- und Raumfahrt Entflammbarkeit nichtmetallischer Werkstoffe Teil 2: Kl

3、einbrenner-Prfung, waagerecht Bestimmung der waagerechten Flammenausbreitung Srie arospatiale Inflammabilit des matriaux non mtalliques Partie 2 : Essai au brleur, horizontal Dtermination de la propagation horizontale de la flamme This “Aerospace Series“ Prestandard has been drawn up under the respo

4、nsibility 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 technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of

5、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. After examination and review by users and formal agreement of ASD-STAN, the ASD-STAN prEN will be submitted as a draft

6、 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 implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national sta

7、ndards 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 standard is entirely voluntary, and its applicability and suitability for any particular use, including any patent inf

8、ringement 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, reaffirmed, stabilized or cancelled. ASD-STAN invites you to send your written comments or any suggestions that may ari

9、se. 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, recording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web

10、 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 Copyright 2018 ASD-STAN prEN 3844-2:2018 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and

11、 definitions . 4 4 Principle of method 5 5 Designation . 5 6 Test apparatus . 5 6.1 Test cabinet . 5 6.2 Specimen holder 5 6.3 Burner . 6 6.3.1 Burner type . 6 6.3.2 Burner fuel 6 6.3.3 Plumbing for gas supply . 6 6.3.4 Flame height indicator 6 6.3.5 Flame temperature . 6 6.4 Timer . 6 6.5 Ruler 6 7

12、 Test specimens . 6 7.1 Number of specimens 6 7.2 Specimens orientation 7 7.3 Specimens size . 7 7.4 Specimens preparation . 7 8 Conditioning 7 9 Burner adjustment . 7 10 Test procedure . 7 11 Calculation . 8 12 Test report . 8 Annex A (informative) Standard evolution form 15 Bibliography 16 prEN 38

13、44-2:2018 (E) 3 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

14、3844-2:2018 (E) 4 1 Scope This standard specifies the test method for the determination of the horizontal flame propagation of non-metallic materials when subjected to a small flame in part or in whole. This test method is also used for testing non-metallic materials which have to meet the test crit

15、eria for the horizontal 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 mea

16、sure 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, or assemblies under actual fire conditions. Howe

17、ver 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 The following documents are referred to in the text in such a way that some o

18、r all of their 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-S

19、cale Burning Tests 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.

20、org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.1 flame spread rate distance travelled by a flame front during its propagation, per unit time, under specified test conditions Note 1 to entry: In this test, it is the speed with which a flame front moves across a test specimen

21、mounted horizontally. The flame spread rate is expressed in mm per minutes. 3.2 time of flame application length of time the burner flame is applied to the specimen 1) Published by: ASTM National (US) American Society for Testing and Materials http:/www.astm.org/. prEN 3844-2:2018 (E) 5 3.3 burn len

22、gth 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 areas where materi

23、al 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 for 15 seconds to the specimen. The flame spread rate is calculated as a result of the measured burn length per unit time

24、. 5 Designation EXAMPLE Description block HORIZONTAL BUNSEN BURNER TEST Identity block EN3844-2 Number of this standard 6 Test apparatus 6.1 Test cabinet Tests shall be conducted in a draught-free cabinet, as shown in Figure 1 or other equivalent enclosures. Details and dimensions of a suitable test

25、 cabinet are given in Figure 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 facilitat

26、e 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 for clearing the cabinet of smoke and fumes after each test. 6.2 Specimen holder The specimen hol

27、der shall be fabricated of corrosion-resistant metal. A specimen holder shall be provided, such that the exposed area of the specimen is at least 50 mm 305 mm. An example for a construction is given in Figure 3. Each of the rectangular frames must be 6,5 mm in thickness. An example for a constructio

28、n is given in Figure 3. prEN 3844-2:2018 (E) 6 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 adjust the gas flow rate and thereby adjust the flame height. The burner shall have no air suppl

29、ied either directly or by aspiration. The Bunsen burner defined in ASTM-D 5025 has been found acceptable. 6.3.2 Burner fuel 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

30、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 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 A flame i

31、ndicator shall be used. A suitable indicator is shown in Figure 5. The indicator shall have two height indicators, e. g. prongs 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 m

32、ethane the tip of the inner cone of the flame will be at the 22 mm prong. The flame height 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

33、, 1,5 mm). The tip of the thermocouple shall be completely in the flame. The flame temperature 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 flame application and the time of the specim

34、en burning. 6.5 Ruler A ruler or a scale, calibrated and graduated to the nearest 1 mm, shall be used 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. prEN 3844-2:2018 (E) 7 7.2 Specimens orientat

35、ion For materials which may have anisotropic flammability properties (i.e. different properties in different directions, such 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 directio

36、n have to be averaged and reported separately. 7.3 Specimens size The specimens shall be a rectangle of at least 75 mm 305 mm, unless the actual size used in the aircraft is smaller. The specimen thickness shall be no thicker than the minimum thickness to be qualified for use in the aircraft. The sp

37、ecimen thickness will not exceed 3 mm. 7.4 Specimens preparation Mark gauge lines on the back surface (opposite the exposed surface) of the specimen as shown in Figure 6. 8 Conditioning Condition specimens at (23 2) C and at (50 5) % relative humidity for min. 24 h. Remove only one specimen at a tim

38、e from the conditioning environment immediately 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 sur

39、e 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. One short edge of the specimen has to be flush with the open end of the specimen holder. The expo

40、sed surface 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. prEN 3844

41、-2:2018 (E) 8 Start the timer as 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: a) if the flame front crosses the 38 mm gauge lin

42、e, note the elapsed time in seconds, t38, at which the crossing occurs; b) if the flame front crosses the 292 mm gauge line, note the elapsed time in seconds, t292, at which the crossing occurs; c) if the specimen burns very slowly so that the flame front does not reach the 292 mm gauge line within

43、4 min or if the flame extinguishes before reaching the 292 mm gauge line, the test terminated, the total burn length in millimetres and the elapsed time in seconds may be noted. After all flaming ceases, open the cabinet door slowly to clear the test cabinet of fumes and smoke. Remove any material f

44、rom the bottom of the cabinet that fell from the specimen. If necessary, clean the test cabinet window prior to testing the next specimen. 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 cros

45、sing 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/m i n60mm38 292 38292 tt ; c) if the specimen burnt very slowly so that the flame front do

46、es not reach the 292 mm gauge line within 4 min after it passes the 38 mm gauge line, measure the burn length df (burn length up from the 38 mm gauge after 240 s) and calculate as follows: flame spread rate mm/min= s s/m i n60mm240df12 Test report The test report shall include the following data: a)

47、 description of the specimen; b) manufacturer/supplier; c) designation of the test method; d) flame spread rate for each specimen tested and the average value; e) burn length for each specimen tested; prEN 3844-2:2018 (E) 9 f) specimen orientation (if applicable); g) observations about melting, sagg

48、ing, 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) name and address of the test laboratory/organisation; j) date of tes

49、ting; k) operators name and signature. Figure 1 Draught-free cabinet prEN 3844-2:2018 (E) 10 Dimensions in millimetres Figure 2 Details and dimensions prEN 3844-2:2018 (E) 11 Dimensions in millimetres Figure 3 Specimen holder prEN 3844-2:2018 (E) 12 Key 1 flowmeter (optional) 2 hose 3 burner 4 needle valve 5 pressure-gauge valve Figure 4 Plumbing of gas supply prEN 3844-2:2018 (E) 13 Dimensions in millimetres Key 1 burner Figure