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1、BRITISH STANDARD BS 4841-1: 1993 Rigid polyurethane (PUR) and polyisocyanurate (PIR) foam for building applications Part 1: Specification for laminated board for general purposes Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:48:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4841-1:1993
2、 This British Standard, having been prepared under the direction of the Plastics and Rubber Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1993 BSI 05-1999 First published May 1975 Second edition October 1993 The following BSI
3、 references relate to the work on this standard: Committee reference PRM/72 Draft for comment 92/46317 DC ISBN 0 580 22541 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Techni
4、cal Committee PRM/72, upon which the following bodies were represented: Association of Building Component Manufacturers Brick Development Association British Board of Agrment British Plastics Federation British Rigid Urethane Foam Manufacturers Association Calcium Silicate Brick Association Limited
5、Cavity Foam Bureau Chief and Assistant Chief Fire Officers Association Department of the Environment (Building Research Establishment) Department of the Environment (Construction Industries Directorate) European Engineering Equipment and Materials Users Association European Phenolic Foam Association
6、 Flat Roofing Contractors Advisory Board Loss Prevention Council Ministry of Defence National Cavity Insulation Association National Federation of Roofing Contractors National House-building Council Polyethylene Foam Insulation Association Royal Institute of British Architects Amendments issued sinc
7、e publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:48:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4841-1:1993 BSI 05-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Construction1 4Composition of fo
8、am core1 5Designation1 6Sampling1 7Physical properties2 8Dimensions2 9Marking2 Annex A Method of test for compressive strength3 Annex B Guidance on thermal conductivity design and 3 day values3 Annex C Method of test for dimensional stability3 Annex D Burning properties of rigid urethane foam core a
9、nd recommendations regarding its use3 Table 1 Designation codes for thermal conductivity1 Table 2 Physical property requirements2 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:48:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4841-1:1993 ii BSI 05-19
10、99 Foreword This British Standard has been prepared under the direction of the Plastics and Rubber Standards Policy Committee. It supersedes BS 4841-1:1975, which is withdrawn. During 1973-4, after consultation with industry, commerce and Government bodies, several discussions took place in the Exec
11、utive Board of the British Standards Institution as a result of concern about potential fire hazards involved in the rapidly increasing use of many polymeric materials, especially for furnishing and construction purposes. Issues of great public importance were involved, relating in particular to the
12、 use of laboratory fire tests to define quality requirements, in view of the general lack of correlation between the results obtained in such small-scale tests and the fire performance of materials and products in actual conditions of use. The Executive Board decided that a detailed review of all th
13、e issues involved should be carried out as a matter of urgency and that this should be comprehensive in scope rather than limited to polymeric materials. For this purpose an authoritative Co-ordinating Committee on Fire Tests was established. In the meantime certain general principles were laid down
14、 regarding the terminology and approach to be adopted in immediate revisions and amendments of the British Standards involving laboratory fire tests. Publication of the 1975 edition was delayed in order that it could be drafted in keeping with this policy. Further changes may be made at a later date
15、 as a result of the general review undertaken by the Co-ordinating Committee on Fire Tests. This edition introduces technical changes but it does not reflect a full review or revision of the standard. It is envisaged that this standard will be replaced by a European Standard in due course and that t
16、he European Standard will be adopted in the BS EN series. A requirement has been included for thermal conductivity to be designated by the manufacturer. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their cor
17、rect 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, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copy
18、right date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:48:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4841-1:1993 BSI 05-19991 1 Scope This British Standard specifie
19、s requirements for laminated boards consisting of a core of rigid urethane foam bonded to two flexible facings. These boards are suitable for use within the cavity of heavy construction cavity walls and as insulation under screeds, but are not recommended for use in ceiling and roofing insulation. I
20、n particular, they should not be used in situations where they are liable to be directly exposed to flame in the event of fire. The end-user should satisfy himself that the finished construction will meet the appropriate requirements of the appropriate building regulations, especially in relation to
21、 fire properties. 2 Normative references This Part of BS 4841 incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendment
22、s to, or revisions of, any of these publications apply to this Part of BS 4841 only when incorporated in it by updating or revision. 3 Construction The laminated board shall be of minimum thickness 12 mm. The boards shall be essentially flat and shall show no significant areas of lack of adhesion be
23、tween facings and foam core. Suitable facings are flexible materials such as paper, which may be coated with a plastics material. 4 Composition of foam core The core material shall consist of rigid urethane foam with a substantially closed cell structure. It shall be suitably formulated to ensure th
24、at, when tested in accordance with the method described in BS 4735:1974, a test specimen of the foam core (facings removed) of 150 mm 50 mm 13 mm subjected to a small flame shall show an extent of burn of less than 125 mm. 5 Designation The boads shall be designated to indicate the thermal conductiv
25、ity of the foam core (see 7.1). The designation shall consist of a two component code comprising the following items in the order presented: a) the number and date of this British Standard, i.e. BS 4841/1:1993; b) a double digit number to indicate the thermal conductivity selected in accordance with
26、 Table 1. An example of the designation of a board with a foam core thermal conductivity of 0.020 W/(mK) is as follows: BS 4841/1:1993/20 Table 1 Designation codes for thermal conductivity 6 Sampling In cases of doubt or dispute as to whether a consignment of boards conforms to this standard, one bo
27、ard shall be selected at random for test from each five hundred boards of any consignment supplied, or from the total if this is less than five hundred. In the event of non-conformity of any board to the requirements of this standard two more boards shall be tested from the same group of five hundre
28、d. It either of these fails, the consignment shall be considered not to conform to the requirements of this standard. Thermal conductivitya (see Annex B) Code W/(m.K) 0.01515 0.01616 0.01717 0.01818 0.01919 0.02020 0.02121 0.02222 0.02323 0.02424 0.02525 0.02626 0.02727 0.02828 0.02929 0.03030 0.031
29、31 0.03232 a NOTE These values are 30 day values for quality control purposes. For corresponding long term design values the manufacturers advice should be sought (see Annex B). Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:48:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4841-1:1993
30、2 BSI 05-1999 7 Physical properties 7.1 Thermal conductivity Thermal conductivity of the foam core shall be determined by either method 7A or method 7B of BS 4370-2:1993 at a mean temperature of 10 C, (30 2) days after manufacture. Materials shall be conditioned throughout this period at (23 2) C an
31、d (50 5) % r.h. NOTESee additional guidance in Annex B concerning the thermal conductivity 3 day values and design values. 7.2 Other properties The other physical properties shall conform to the requirements given in Table 2. 8 Dimensions The board shall be supplied to the dimensions given below whe
32、n determined as described in method 1 of BS 4370-1:1988. 9 Marking The product, package or invoice shall be marked with at least the following information: a) manufacturers name or trademark; b) product designation as given in clause 51); c) manufacturers description and/or product reference. Table
33、2 Physical property requirements Length(2 400 3) mm Width(1 200 3) mm Tolerance on thickness 1.5 mm on nominal thicknesses of 12 mm to 38 mm and 3 mm on nominal thickness greater than 38 mm Rectangularity The difference between the lengths of diagonals of any board shall be not greater than 9 mm. 1)
34、 Marking BS 4841/1:1993 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration
35、is not to be confused with third party certification of conformity, which may also be desirable. Physical propertyTest requirementTest method Compressive strength/stress of core at 10 % deflection, min. Method 3 of BS 4370-1:1988 applied as stated in Annex A kPa140 Water vapour permeability of foam
36、core, at 38 C and 88 % r.h. max. PUR boards 5.5 PIR boards 8.5 Method 8 of BS 4370-2:1993, condition a) ng/(Pasm) Dimensional stability, linear change, %, max. Method 5A of BS 4370-1:1988 applied as stated in Annex C at ( 15 2) C0.5 at (70 2) C and (95 5) % r.h.5.0 Burning characteristicsa of small
37、specimens of foam core (see clause 4 and Annex D) Extent of burn less than 125 mm BS 4735:1974 a CAUTION. The small-scale laboratory test described in BS 4735 is solely for assistance in monitoring consistency of production and is not a means of assessing the potential fire hazard of a material in u
38、se (see Annex D). Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:48:21 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4841-1:1993 BSI 05-19993 Annex A Method of test for compressive strength Carry out the test in accordance with the requirements of method 3 of BS 4370-1:1988. Test specimen
39、s shall be the full thickness of the board and shall include the facings. They shall be selected at random, but shall not be taken from within 150 mm of the edge of the board. Carry out the test in a direction perpendicular to the plane of the board. It should be remembered that the compressive stre
40、ngth/stress of the foam core is under test. Determination of the results should therefore be based on the core thickness even though the facings may contribute significantly to the total thickness of the board. Annex B Guidance on thermal conductivity design and 3 day values In addition to the 30 da
41、y maximum thermal conductivity value which forms the specification value for the purposes of this standard, two related maximum thermal conductivity values have practical importance, and should be obtained for the product from the manufacturer as follows. a) Design value of thermal conductivity This
42、 figure takes into account the limited diffusion of gases which can be used as a basis for user calculations. Generally this will be higher than or equal to the 30 day value. b) The 3 day values of thermal conductivity This value is often used in manufacturing control operations, to ensure the quali
43、ty of product is regularly maintained. Generally it will be lower than or equal to the 30 day value. Annex C Method of test for dimensional stability Carry out the test in accordance with method 5A of BS 4370-1:1988. The facings shall not be removed from the test specimens. The test shall be carried
44、 out under the following conditions: a) ( 15 2) C for 24 h; b) (70 2) C, (95 5) % r.h. for 24 h. Annex D Burning properties of rigid urethane foam core and recommendations regarding its use Rigid urethane foam, like many other materials, is combustible. The material specified in this standard has ho
45、wever been formulated so that, under certain well defined conditions, its tendency to burn is reduced. The use of such a formulation is indicated by specimens of the material showing an extent of burn less than 125 mm when subjected to the test method in BS 4735:1974. The limited relevance of the la
46、tter standard is defined in the caution note to Table 2. Nevertheless, evidence exists to indicate that some aspects of fire performance may be predictable from the results of this test. Work commissioned by the Government and carried out by the Rubber and Plastics Research Association2) covered, am
47、ong other items, the behaviour of flexible urethane foams when subjected to the method of test in BS 4735:1974 and other ad hoc ignition tests (e.g. exposure to a lighted cigarette, match, candle, paper or fibre board crib, or to radiant heat). It was concluded in this respect that a slightly improv
48、ed performance resulted from the use of a suitable formulation but only if the ignition source was small and of limited duration of application, e.g. a lighted match. Similar indications both for rigid and flexible urethane foams resulted from work reported in the Journal of Cellular Plastics3). In
49、this light of this evidence and of other experience in the industry, it is considered that during storage, etc., prior to establishing the final completed application, core materials of which specimens show an extent of burn of less than 125 mm when tested by the method in BS 4735:1974, may be expected to be less liable than other materials not satisfying this requirement to spread the flame from a low energy source such as a lighted match or a burning cigarette. Once the early ignition phase of a fire has passed, many o
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