BS ISO 9772-2012 Cellular plastics Determination of horizontal burning characteristics of small specimens subjected to a small flam《泡沫塑料 需用小火焰的小试样的水平燃烧特性的测定》.pdf

《BS ISO 9772-2012 Cellular plastics Determination of horizontal burning characteristics of small specimens subjected to a small flam《泡沫塑料 需用小火焰的小试样的水平燃烧特性的测定》.pdf》由会员分享，可在线阅读，更多相关《BS ISO 9772-2012 Cellular plastics Determination of horizontal burning characteristics of small specimens subjected to a small flam《泡沫塑料 需用小火焰的小试样的水平燃烧特性的测定》.pdf（28页珍藏版）》请在麦多课文档分享上搜索。

1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 9772:2012 Cellular plastics Determination of horizontal burning characteristics of small specimens subjected to a small flameBS ISO 9772:2012 BRITISH STANDARD National

2、foreword This British Standard is the UK implementation of ISO 9772:2012. It supersedes BS ISO 9772:2001 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/26, Burning behaviour of plastics and rubbers. A list of organizations represented on this com

3、mittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012 ISBN 978 0 580 69761 6 ICS 1

4、3.220.40; 83.100 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2012. Amendments issued since publication Date T e x t a f f e c t e dBS ISO 9772:20

5、12 ISO 2012 Cellular plastics Determination of horizontal burning characteristics of small specimens subjected to a small flame Plastiques alvolaires Dtermination des caractristiques de combustion de petites prouvettes en position horizontale, soumises une petite flamme INTERNATIONAL STANDARD ISO 97

6、72 Third edition 2012-09-01 Reference number ISO 9772:2012(E)BS ISO 9772:2012ISO 9772:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

7、electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright

8、iso.org Web www.iso.org Published in SwitzerlandBS ISO 9772:2012ISO 9772:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 Terms and definitions . 1 4 Significance of test . 2 5 Apparatus 2 6 Specimens . 7 6.1 Extended applicatio

9、n of test results 7 6.2 Preparation of specimens . 8 7 Conditioning . 8 7.1 Specimens . 8 7.2 Cotton indicator . 9 8 Test procedure . 9 8.1 Adjustment of flame . 9 8.2 Adjustment of specimen support .10 8.3 Positioning of cotton indicator 11 8.4 Positioning of specimen 11 8.5 Burning procedure 11 8.

10、6 Measurements 11 8.7 Preparation for the next test .12 9 Calculations 12 10 Precision 12 11 Test report .12 Annex A (informative) Classification system 14 Annex B (informative) Precision .16 Bibliography .17BS ISO 9772:2012ISO 9772:2012(E) Foreword ISO (the International Organization for Standardiz

11、ation) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be

12、 represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standar

13、ds are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Intern

14、ational Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 9772 was

15、 prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 4, Burning behaviour. This third edition cancels and replaces the second edition (ISO 9772:2001), which has been technically revised. It also incorporates the Amendment ISO 9772:2001/Amd.1:2003. iv ISO 2012 All rights reservedBS I

16、SO 9772:2012ISO 9772:2012(E) Introduction Cellular plastics are widely used in products for packaging, building, housing, industry and transport, in various applications. The burning behaviour of cellular plastics is a concern for the fire safety of these products. This International Standard gives

17、a method for the determination of the burning behaviour of cellular plastics using a small flame source. The burning behaviour of cellular plastics is influenced by the test specimen orientation (vertical or horizontal). This method of test evaluates specimens which are oriented horizontally. The me

18、thod described is also intended as a pre-selection test for materials used for components of devices and appliances. The final acceptance of the material would be dependent upon its use in complete equipment that conforms with the standards applicable to such equipment. It should be noted that the t

19、est results obtained by the test specified in this International Standard alone cannot represent all the aspects of the fire hazard of cellular plastics in end-use conditions. ISO 2012 All rights reserved vBS ISO 9772:2012BS ISO 9772:2012Cellular plastics Determination of horizontal burning characte

20、ristics of small specimens subjected to a small flame 1 Scope 1.1 This International Standard specifies a small-scale laboratory screening procedure for comparing the relative burning characteristics of horizontally oriented, small cellular plastic specimens having a density less than 250 kg m 3dete

21、rmined in accordance with ISO 845, when exposed to a small-flame ignition source. NOTE Another International Standard exists covering flexible cellular plastic and cellular rubber: ISO 3582 2 . 1.2 This method of test is intended for quality assurance and limited product evaluation of cellular plast

22、ic materials under controlled laboratory conditions, and is not intended to assess the fire behaviour of e.g. building materials or furnishings under actual fire conditions. 1.3 The optional classification system described in Annex A is intended for the pre-selection of cellular plastic materials fo

23、r products, including the determination of the ranges of material parameters that give the same classification (see 6.1). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undate

24、d references, the latest edition of the referenced document (including any amendments) applies. ISO 845, Cellular plastics and rubbers Determination of apparent density ISO 1923, Cellular plastics and rubbers Determination of linear dimensions ISO 10093, Plastics Fire tests Standard ignition sources

25、 ISO 13943, Fire safety Vocabulary 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 13943 and the following apply. 3.1 afterflame time length of time for which a material continues to flame, under specified test conditions, after the ign

26、ition source has been removed 3.2 afterglow time length of time for which a material continues to glow, under specified test conditions, after the ignition source has been removed and/or extinguishment of flame 3.3 extended application of test results process of predicting a test result, on the basi

27、s of one or more existing test results obtained by the same test, for a product for which a property and/or the intended end-use application(s) are subject to variation INTERNATIONAL STANDARD ISO 9772:2012(E) ISO 2012 All rights reserved 1BS ISO 9772:2012ISO 9772:2012(E) 4 Significance of test 4.1 T

28、ests conducted on a material under the conditions specified can be of considerable value when comparing the horizontal burning characteristics of different materials, controlling manufacturing processes or assessing any changes in formulation or treatment prior to use. 4.2 Assessment of fire hazard

29、requires consideration of factors such as fuel contribution, intensity of burning (rate of heat release) and products of combustion, as well as environmental factors such as intensity of source, orientation of exposed material and ventilation conditions. 4.3 Horizontal burning characteristics, as me

30、asured by this test procedure, might be affected by factors such as density, any anisotropy of the cellular material, its melting characteristics, its colour and its thickness. 4.4 Certain materials might shrink from the applied flame without igniting. In this event, the test results are not valid,

31、and additional test specimens will be required to obtain 10 valid test results. If this proves impossible due to non-ignition of all the specimens, then this test is not suitable for these materials. 4.5 The horizontal burning characteristics of some cellular plastic materials might change with time

32、, and tests are therefore conducted before and after heat ageing. 5 Apparatus 5.1 Laboratory fume hood, having an inside volume of at least 0,5 m 3 . The chamber shall permit observation of tests in progress and shall be draught free whilst allowing normal thermal circulation of air past the test sp

33、ecimen during burning. The inside surfaces of the chamber shall be of a dark colour. When a light meter, facing towards the rear of the chamber, is positioned in place of the test specimen, the recorded light level shall be less than 20 lux. For safety and convenience, this enclosure (which can be c

34、ompletely closed) shall be fitted with an extraction device, such as an exhaust fan, to remove products of combustion that might be toxic. The extraction device shall be turned off during the test and turned on again immediately after the test to remove the fire effluents. A positive closing damper

35、might be needed. NOTE The amount of oxygen available to support combustion is naturally important for the conduct of these flame tests. For tests conducted by this method when burning times are protracted, chamber sizes greater than 0,5 m 3might be needed to provide reproducible results. 5.2 P/PF2 l

36、aboratory burner, as specified in ISO 10093, having a barrel length of (100 10) mm and an internal diameter of (9,5 0,3) mm. The barrel shall not be equipped with an end attachment, such as a stabilizer. 5.3 Burner wing top, having an opening of internal length (48 1) mm and internal width (1,3 0,05

37、) mm (see Figure 1). To ensure the wing top opening is uniform in width, a (1,3 0,05) mm steel wire or spacer may be slid along its length. 5.4 Support gauze, approximately 215 mm long by 75 mm wide, having 13 mm of its length bent to form a right angle at one end as shown in Figure 2. It shall cons

38、ist of (6,4 0,5) mm mesh gauze constructed of (0,85 0,10) mm diameter stainless steel or low carbon steel wire. A different support gauze is necessary for each specimen unless means are provided to burn off any residue from a prior test. 5.5 Support-gauze holder, consisting of two laboratory ring st

39、ands with clamps adjustable to the desired angles and heights. The support-gauze holder shall be constructed from aluminium or steel and shall satisfy the following conditions: the long axis of the gauze is maintained to within 1 of the horizontal; 2 ISO 2012 All rights reservedBS ISO 9772:2012ISO 9

40、772:2012(E) the nearest end of the specimen is (13 1) mm above the burner wing top (see Figures 3 and 4); the space both above and below the specimen is not obstructed; a means is provided for positioning the burner in the correct location relative to the specimen, preferably with a sliding mechanis

41、m and a stop to allow fast movement of the burner flame towards and away from the specimen; the gauze is equidistant from the front and back, and from both sides, of the test chamber, and is (175 25) mm above the cotton indicator base-board (see Figure 3). 5.6 Two timing devices, which can be read t

42、o within 1 s or less. 5.7 Measuring scale, graduated in millimetres, to measure the length, width and thickness of the test specimen. 5.8 Gas supply, supplying technical-grade methane gas with a purity of at least 98 % and having a heat content of (37 1) MJ m 3 , with regulator and meter to ensure u

43、niform gas flow. Other gas mixtures having a heat content of approximately (37 1) MJ m 3or propane having a heat content of (94 2) MJ m 3have been shown to provide similar results when using the procedure of Clause 8. In cases of dispute, however, technical-grade methane shall be used. 5.9 Manometer

44、 and gas flow meter, calibrated for the gas used and capable of reading the values shown in Table 1. 5.10 Cotton indicator, consisting of a pad of dry, absorbent 100 % cotton measuring approximately 150 mm long, 75 mm wide and 6 mm thick and having a mass of approximately 0,16 g. 5.11 Desiccator, co

45、ntaining anhydrous calcium chloride or another drying agent which can be maintained at (23 2) C and gives a relative humidity not exceeding 20 %. 5.12 Conditioning room or chamber, capable of being maintained at (23 2) C and a relative humidity of (50 5) %. 5.13 Air-circulating oven, giving a minimu

46、m of five air-changes per hour, and capable of being maintained at (70 2) C or another agreed temperature. 5.14 Dial-gauge micrometer, for measuring the specimen thickness, with a 650 mm 2pressure foot exerting a pressure of (0,175 0,035) kPa. 5.15 Cotton indicator base-board, measuring approximatel

47、y 215 mm long and 75 mm wide and having a height such that the distance between the support gauze and the top of the base-board is (175 25) mm. The cotton indicator base-board shall be made of non-combustible board having a dry density of (850 200) kg m 3 . It shall not be made of metal. ISO 2012 Al

48、l rights reserved 3BS ISO 9772:2012ISO 9772:2012(E) Dimensions in millimetres Material: copper or stainless steel Figure 1 Burner wing top 4 ISO 2012 All rights reservedBS ISO 9772:2012ISO 9772:2012(E) Dimensions in millimetres Key 1 test specimen 2 burner wing top 3 support gauze Figure 2 Test spec

49、imen and support gauze ISO 2012 All rights reserved 5BS ISO 9772:2012ISO 9772:2012(E) Dimensions in millimetres Key 1 test specimen 2 support gauze 3 cotton indicator 4 cotton indicator base-board 5 burner wing top 6 burner aHeight of cotton indicator base-board. Figure 3 Position of cotton indicator below support gauze 6 ISO 2012 All rights reservedBS ISO 9772:2012ISO 9772:2012(E) Dimensions in millimetres Key 1 test specimen, maximum thickness 13 m