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1、BRITISH STANDARD BS EN ISO 4589-3:1996 Plastics Determination of burning behaviour by oxygen index Part 3: Elevated-temperature test The European Standard EN ISO 4589-3:1996 has the status of a British Standard ICS 83.080.01 BS EN ISO 4589-3:1996 This British Standard, having been prepared under the
2、 direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1996 BSI 10-1998 The following BSI references relate to the work on this standard: Committee reference PRI/26 Draft for comment 94/300871 DC ISBN
3、0 580 26770 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/26, Burning behaviour of plastics and rubbers, upon which the following bodies were represented: Association of Building Component Manufacturers Associatio
4、n of Manufacturers of Domestic Electrical Appliances British Cable Makers Confederation British Electrical Systems Association (BEAMA Ltd.) British Plastics Federation British Railways Board Department of the Environment (Building Research Establishment) ERA Technology Ltd. Electrical and Electronic
5、 Insulation Association (BEAMA Ltd.) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Association Federation of the Electronics Industry GAMBICA (BEAMA Ltd.) Lighting Industry Federation Ltd. Ministry of Defence National Supervising Inspectorate RAPRA Technology L
6、td. Society of British Aerospace Companies Limited University of Ulster Warrington Fire Research Centre Amendments issued since publication Amd. No.DateComments BS EN ISO 4589-3:1996 BSI 10-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Introduction3 1Scop
7、e3 2Normative reference3 3Definitions3 4Principle3 5Apparatus4 6Calibration and maintenance of equipment4 7Preparation of test specimens5 8Procedure5 9Calculations and expression of results5 10Procedure C Comparison with a specified minimum value of the oxygen index at a specified temperature (short
8、 procedure)6 11Precision6 12Test report6 Annex A (normative) Measurement of flammability temperature (FT)14 Annex B (informative) Inter laboratory test data on flammability temperature15 Annex C (informative) Typical test results sheet16 Figure 1 Diagram of typical apparatus for determination of oxy
9、gen index at elevated temperature7 Figure 2 Diagram of typical heated chimney8 Figure 3 Diagram of typical form of preheater and base of assembly for test chimney9 Figure 4 Diagram of typical chimney outlet restrictor10 Figure 5 Design of support frame for non-self-supporting test specimens11 Figure
10、 6 Diagram of typical specimen-holder transfer tool12 Figure 7 Details of test specimen support13 Table B.1 Summary of round-robin results15 Table C.1 Values of k for calculating the oxygen index concentration from determinations made by Dixons “up-and-down method”17 BS EN ISO 4589-3:1996 ii BSI 10-
11、1998 National foreword This British Standard has been prepared by Technical Committee PRI/26 and is the English language version of EN ISO 4589-3:1996 Plastics Determination of burning behaviour by oxygen index Part 3: Elevated-temperature test published by the European Committee for Standardization
12、 (CEN). It should be used in conjunction with BS ISO 4589-2:1996 Plastics Determination of burning behaviour by oxygen index Part 2: Ambient temperature test. Annex A of BS EN ISO 4589-3:1996 supersedes BS 2782-1: Methods 143A and 143B:1989 which are withdrawn. A British Standard does not purport to
13、 include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover,
14、pages i and ii, the EN title page, pages 2 to 18 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4589-3 Au
15、gust 1996 ICS 83.080 Descriptors: Plastics, tests, physical tests, fire tests, flammability testing, determination, oxygen index, test equipment English version Plastics Determination of burning behaviour by oxygen index Part 3: Elevated-temperature test (ISO 4589-3:1996) Plastiques Dtermination du
16、comportement au feu au moyen de lindice doxygne Partie 3: Essai haute temprature (ISO 4589-3:1996) This European Standard was approved by CEN on 1996-07-04. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the
17、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 Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German).
18、 A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germa
19、ny, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 All ri
20、ghts of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO 4589-3:1996 E EN ISO 4589-3:1996 BSI 10-1998 2 Foreword The text of the International Standard ISO 4589-3:1996 has been prepared by Technical Committee ISO/TC 61, Plas
21、tics, in collaboration with Technical Committee CEN/TC 249, Plastics, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 1997, and conflicting nation
22、al standards shall be withdrawn at the latest by February 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Irel
23、and, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. EN ISO 4589-3:1996 BSI 10-19983 Introduction This part of ISO 4589 has been prepared to extend the methods available for the determination of flammability by oxygen index (see ISO 4589-2) to typ
24、ical elevated temperatures to which a plastic material can be exposed in a service situation. It also provides a method for determining the temperature at which combustion of a small bar of material is just supported in air under certain test conditions; the resulting temperatureis termed the flamma
25、bility temperature. This part of ISO 4589 is intended to be used in conjunction with ISO 4589-2 which describes the basic oxygen index test method. 1 Scope This part of ISO 4589 specifies methods for determining the minimum concentration of oxygen, in a mixture with nitrogen, that will support combu
26、stion of small vertical test specimens under specified test conditions over a range of temperatures typically between 25 C and 150 C. The results are defined as oxygen index values at the test temperature, which is typical of the practical temperature that a plastic material may experience in an ove
27、rheated service situation. Methods are provided for testing materials that are self-supporting at the test temperature in the form of vertical bars or sheet up to 10,5 mm thick. These methods are suitable for solid, laminated or cellular materials characterized by an apparent density greater than 10
28、0 kg/m3. The methods may also be applicable to some cellular materials having an apparent density of less than 100 kg/m3. A method is provided for testing flexible sheet or film materials while supported vertically. This part of ISO 4589 also includes a method (see annex A) for determining the tempe
29、rature at which the oxygen index of small vertical test specimens in air is 20,9 under specified test conditions. The result is defined as the flammability temperature (FT) and the method is limited to the determination of results less than 400 C. The method is not applicable to materials having an
30、oxygen index of 5 C may be used to establish an approximate value of FT. A.13 Determine at least three values for the FT of the material by carrying out the procedure from A.3 to A.12 inclusive at least three times. A.14 Calculate and record the FT of the material as the mean value of the three or m
31、ore values determined in accordance with A.13. Express it as the mean value when rounded to the nearest 1 C, with an exactly intermediate result being rounded downwards. qvis the total gas flow rate through the chimney, in litres per second; dis the internal diameter of the chimney, in millimetres.
32、F1 27 qv d2 - - 106,= EN ISO 4589-3:1996 BSI 10-199815 Annex B (informative) Interlaboratory test data on flammability temperature B.1 A round-robin correlation exercise was conducted in the UK in 1986 to assess the effect of different types of specimen support. B.2 Eight laboratories participated i
33、n this exercise, using thermoplastic and cross-linked plastic specimens. Two specimen support holders were evaluated: one using silica rods and the other constructed of nichrome wire. A summary of the FT results are shown in Table B.1. B.3 The type of specimen support was not found to affect the res
34、ults significantly. Although silica rods had been in use by some laboratories for some time without problems, most laboratories reported difficulties with this type of support and expressed a preference for a nichrome wire support. Table B.1 Summary of round-robin results All values in degrees Celsi
35、us Specimen support Test laboratoryFT 12345678Average Thermoplastic material Silica rods268266260270244253253249258 Nichrome wire263276260260239260253248257 Cross-linked material Silica rods296274280270273273280278 Nichrome wire292262280270272275267260272 EN ISO 4589-3:1996 16 BSI 10-1998 Annex C (i
36、nformative) Typical test results sheet Test results sheet for oxygen index at elevated temperature, determined in accordance with ISO 4589-3 Section 1: Determination of oxygen concentration for one pair of “X” and “O” responses at = 2s 3 - -d 3s 2 - -d 19blank BSI 389 Chiswick High Road London W4 4A
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