1、BRITISH STANDARD BS 5946:1980 Method of test for Determination of the punking behaviour of phenol-formaldehyde foam UDC 678-405.8:620.192.424:536.46:678.6323221BS5946:1980 This British Standard, having been prepared under the directionof the Plastics Standardsand Rubber StandardsCommittees, was publ
2、ished under the authority ofthe Executive Board and comesinto effect on 31October1980 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PLC/RUC/10 Draft for comment 78/55439 DC ISBN 0 580 11502 X Cooperating organizations The Plastics Standards Committ
3、ee and Rubber Standards Committee, under whose direction this British Standard was prepared, consist of representatives from the following: British Association of Synthetic Rubber Manufacturers* British Plastics Federation* British Resin Manufacturers Association British Rubber Manufacturers Associa
4、tion* Chemical Industries Association* Department of Industry (Chemicals and Textiles) Department of Prices and Consumer Protection Metrology Quality Assurance and StandardsDivision Department of the Environment (PSA)* Department of the Environment (Building Research Establishment) Electrical and El
5、ectronic Insulation Association (BEAMA) Electrical Installation Equipment Manufacturers Association (BEAMA) Electrical Research Association Engineering Equipment Users Association Institution of Production Engineers Medical Sterile Products Association Ministry of Defence* Plastics and Rubber Instit
6、ute Post Office Royal Institute of British Architects* Rubber and Plastics Research Association of Great Britain* Rubber Growers Association Society of Chemical Industry Society of Motor Manufacturers and Traders Limited The Malaysian Rubber Producers Research Association The organizations marked wi
7、th an asterisk in the above list, together with the following, were directly represented on the Technical Committees entrusted with the preparation of this British Standard: British Printing Industries Federation British Railways Board British Rigid Urethane Foam Manufacturers Association Furniture
8、Industry Research Association Furniture, Timber and Allied Trades Union Phenolic Foam Manufacturers Association Pira (The Research Association for the Paper and Board, Printing and Packaging Industries) National Bedding Federation Society of British Aerospace Companies Limited Amendments issued sinc
9、e publication Amd. No. Date of issue CommentsBS5946:1980 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 0 Introduction 1 1 Scope 1 2 References 1 3 Reagent 1 4 Apparatus 1 5 Test pieces 1 6 Number of test pieces 1 7 Conditioning 1 8 Procedure 1 9 Expression of r
10、esults 2 10 Test report 1 Figure 1 Cubical wire case to contain test piece 2 Figure 2 Arrangement of test assembly 3 Figure 3 Typical graph showing non-punking behaviour 4 Figure 4 Typical graph showing punking behaviour 4 Publications referred to Inside back coverBS5946:1980 ii BSI 12-1999 Foreword
11、 This British Standard has been prepared under the direction of the Plastics Standards Committee and the Rubber Standards Committee. The standard provides a method of test for the determination of the punking behaviour of phenol-formaldehyde foams intended for use in thermal insulation. A British St
12、andard does not purport to 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 cove
13、r, an inside front cover, pagesi andii, pages1 to4, an inside back cover 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.BS5946:1980 BSI 12-1999 1 0 Introduction Th
14、e incidence of punking is observed in some phenol-formaldehyde foams and consists of a slow combustion (smouldering) initiated by the localized application of a source of heat. Propagation of the combustion front continues without the further outside application of heat until the foam is reduced to
15、a carbonaceous char. The phenomenon of punking is not well understood and further research into the factors involved is required. This standard method of test is therefore only empirical, but it provides the best guide at present available on the punking behaviour of any given phenol-formaldehyde fo
16、am formulation. Reproducibility of results has been confirmed by interlaboratory comparison. 1 Scope This method of test is applicable to slab stock phenol-formaldehyde foams for use in thermal insulation. It provides a means of distinguishing between punking and non-punking foams. The test method d
17、escribed in this standard is primarily for the purposes of monitoring the consistency of production of phenol-formaldehyde foams. Its use gives an indication of the punking or non-punking behaviour of the material. In no circumstances should the test results thus obtained be considered as an overall
18、 indication of the potential fire hazard presented by the foam under actual conditions of use. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Reagent 3.1 Commercial grade propane, complying with the requirements of BS4250. 4 Apparatus
19、4.1 Wire cage. A cubical wire cage of side125mm and mesh25mm with open top (seeFigure 1). 4.2 Temperature indicator. Two temperature indicators, T 1and T 2 . These may be either mercury-in-glass thermometers with ranges0 C to360 C or thermocouples connected to a chart recorder. NOTEIf thermocouples
20、are used, they should have the same thermal capacity as mercury-in-glass thermometers. 4.3 Bunsen burner, 9mm internal bore, capable of being fuelled with commercial grade propane (3.1). 4.4 Stop-watch 5 Test pieces The test piece shall be a cube of side120 5mm and shall be cut, without deformation
21、of the original cell structure, to give surfaces free from skins, voids or blemishes. The dimensions shall be determined by method1 of BS4370-1:1968. 6 Number of test pieces Two test pieces shall normally be tested from each sample of foam. For material suspected of being grossly anisotropic, one se
22、t of two test pieces shall be tested with the vertical faces parallel to the suspected direction of anisotropy and a second set of two test pieces shall be tested with the horizontal faces parallel to the suspected direction of anisotropy. 7 Conditioning Test pieces shall be conditioned for a period
23、 of not less than16h at23 2 C and505%r.h. immediately before testing. 8 Procedure Place the test piece in the wire cage (4.1) avoiding any significant deformation of the cell structure. Insert the temperature indicators (4.2) into the test piece in the positions indicated inFigure 2. Support the ass
24、embly in a draught-free environment in such a position that the top of the bunsen burner (4.3) is25mm below the centre of the test piece. Remove the burner and connect it to a source of commercial grade propane (3.1). Adjust the flame until it is just non-smoky and is50mm in length. Re-position the
25、ignited burner underneath the test assembly and start the stop-watch (4.4). Monitor and record the test piece temperatures either autographically if using thermocouples, or at appropriate intervals if using thermometers and the stop-watch. Remove the bunsen burner when the temperature indicator (T 1
26、 ) nearest to the heating source registers180 C. Continue to record the temperature at each of the temperature indicators (T 1and T 2 ) either until each exceeds360 C or until a fall in temperature to below100 C is registered atT 1 .BS5946:1980 2 BSI 12-1999 9 Expression of results An increase in te
27、mperature beyond360 C, on eachof the indicators, indicates that the phenol-formaldehyde foam exhibits punking behaviour. A fall in temperature at T 1to below100 C indicates that the foam is non-punking. Punking and non-punking behaviour is illustrated graphically inFigure 3 andFigure 4. 10 Test repo
28、rt The test report shall include: a) the following statement: “The following test results relate only to the behaviour of the test specimens under the particular conditions of test: they shall not be used as a means of assessing the potential fire hazard of the material in use.” b) a description of
29、the material tested; c) the test conditions; d) the temperature/time behaviour determined during the test; e) a statement of the results,i.e. whether the sample of foam is punking or non-punking under the conditions of test; f) the number of this British Standard, i.e.BS5946. NOTEWire for cage const
30、ruction should be of stainless steel and of diameter0.8 0.2mm. All dimensions are in millimetres. Figure 1 Cubical wire case to contain test pieceBS5946:1980 BSI 12-1999 3 All dimensions are in millimetres. Figure 2 Arrangement of test assemblyBS5946:1980 4 BSI 12-1999 Figure 3 Typical graph showing
31、 non-punking behaviour Figure 4 Typical graph showing punking behaviourBS5946:1980 BSI 12-1999 Publications referred to BS 4250, Commercial butane and propane. BS 4370, Methods of test for rigid cellular materials. BS 4370-1, Methods 1-5. BS 5946:1980 BSI 389 Chiswick High Road London W4 4AL BSIBrit
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