1、BRITISH STANDARD BS 5608:1993 Specification for Preformed rigid polyurethane (PUR) and polyisocyanurate (PIR) foams for thermal insulation of pipework and equipmentBS 5608:1993 This British Standard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was p
2、ublished underthe authority of the Standards Board and comes intoeffect on 15 November 1993 BSI 07-1999 First published December 1978 Second edition June 1986 Third edition November 1993 The following BSI references relate to the work on this standard: Committee reference PRM/72 Draft for comment 92
3、/46013 DC ISBN 0 580 22273 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/72, upon which the following bodies were represented: Association of Building
4、Component Manufacturers Brick Development Association British Board of Agrment British Plastics Federation British Rigid Urethane Foam Manufacturers Association Calcium Silicate Brick Association Limited Cavity Foam Bureau Department of the Environment (Building Research Establishment) Department of
5、 the Environment (Construction Industries Directorate) Engineering Equipment and Materials Users Association European Phenolic Foam Association Flat Roofing Contractors Advisory Board Ministry of Defence National Federation of Roofing Contractors National House-building Council Polyethylene Foam Ins
6、ulation Association Royal Institute of British Architects The following bodies were also represented in the drafting of the standard through subcommittees and panels: British Ceramic Research Ltd. British Urethane Contractors Association (BUFCA) RAPRA Technology Ltd. Amendments issued since publicat
7、ion Amd. No. Date CommentsBS 5608:1993 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Designation 1 4 Composition 1 5 Physical properties 2 6 Dimensions and dimensional tolerances 2 7 Condition and appearance 2 8 Sampling 2 9 General requ
8、irements 3 10 Marking 3 Annex A (normative) Method of preparation of a moulded flat test piece 4 Annex B (informative) Guidance on thermal conductivity design and3 day values 4 Annex C (normative) Method of test for compression characteristics 4 Annex D (normative) Method of test for dimensional sta
9、bility 4 Annex E (informative) Burning properties of rigid PUR and PIR foam and recommendations for use 4 Annex F (informative) Notes for designers 5 Table 1 Designation codes for thermal conductivity 1 Table 2 Physical property requirements 2 Table 3 Dimensional tolerances for pipe sections and lag
10、s 3 Table 4 Dimensional tolerances for slabs 3 List of references Inside back coverBS 5608:1993 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Plastics and Rubber Standards Policy Committee. It supersedes BS5608:1986 which is withdrawn. In the 1986 edition
11、 one category of rigid polyurethane (PUR) and polyisocyanurate (PIR) foam products was excluded, the continuously formed pipe sections; and one category added, slabs. The performance requirements and test methods were updated from the1978 edition together with the guidance on burning properties and
12、recommendations regarding their use. This edition introduces technical changes but it does not reflect a full review or revision of the standard. Requirements have been included for thermal conductivity to be designated by the manufacturer. It is envisaged that this standard will be replaced by a Eu
13、ropean Standard in due course and that the European Standard will be adopted in the BSEN series. A British Standard 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 doe
14、s 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, pages1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. Thi
15、s will be indicated in the amendment table on the inside front cover.BS 5608:1993 BSI 07-1999 1 1 Scope This British Standard specifies the composition, physical properties and dimensional tolerances for preformed rigid polyurethane (PUR) and polyisocyanurate (PIR) foams for the thermal insulation o
16、f pipework and equipment. It applies to slabs, cut and moulded pipe sections and radiused and bevelled lags. The nominal temperature range f or which the insulation material is suitable is 180 C to +140 C (see Annex F). NOTE 1No values are specified in this standard for the length, bore and outside
17、diameter of pipe sections and lags or for the length and width of slab stock; these should be as specified by the purchaser. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are
18、 cited at the appropriate points in the text and the publications are listed on this inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this British Standard only when incorporated in it by updating or revision. 2.2 Informative references This British St
19、andard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Designation For the purposes of this British Standard, th
20、e materials are divided into four types as follows. The designation shall consist of a three component code comprising the following items, in the order presented: a) the number and date of this British Standard, i.e.BS5608:1993 b) a number indicating the foam type; c) a double digit number to indic
21、ate the thermal conductivity selected in accordance with Table 1. An example of the designation required for a type4 foam with a thermal conductivity of0.020W/mK) is as follows: BS 5608:1993/4/20. NOTEAnnex F gives additional guidance on the applications of these categories. Table 1 Designation code
22、s for thermal conductivity 4 Composition The material shall consist of rigid polyurethane or rigid polyisocyanurate foam with a closed cell structure. The material shall be suitably formulated to ensure that, when tested by the method described in BS4735:1974, a test specimen of150mm 50mm 13mm expos
23、ed to a small flame shall show an extent burnt of less than125mm for rigid polyurethane foam and less than25mm for rigid polyisocyanurate foam. NOTEMaterials indicated by PUR are substantially composed of polyurethane linkages and those indicated by PIR are substantially composed of polyisocyanurate
24、 linkages. Type 1 Polyurethane foams suitable for general use Type 2 Polyurethane foams suitable for use where there is a requirement for greater resistance to compressive forces Type 3 Polyisocyanurate foams suitable for general use Type 4 Polyisocyanurate foams suitable for use where there is a re
25、quirement for greater resistance to compressive forces Thermal conductivity (see 5.1) W/(mK) Code 0.015 0.016 0.017 0.018 0.019 0.020 0.021 0.022 0.023 0.024 0.025 0.026 0.027 0.028 0.029 0.030 0.031 0.032 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 NOTEThese values are 30 day values for q
26、uality control purposes. For corresponding long-term design values the manufacturers advice should be sought (see Annex B).BS 5608:1993 2 BSI 07-1999 5 Physical properties 5.1 Thermal conductivity Thermal conductivity shall be determined by either method7A or7B of BS4370-2:1992 at a mean temperature
27、 of10 C, (30 2) days after manufacture. Materials shall be conditioned throughout this period at(23 2) C and(50 5)% r.h. NOTESee additional guidance in Annex B on information concerning the thermal conductivity3day values and design values. 5.2 Other properties The materials shall conform to the req
28、uirements in Table 2 when tested in accordance with the methods listed therein. 6 Dimensions and dimensional tolerances 6.1 For single-layer components or the first layer of a multi-layer component, the bore shall be the specified outside diameter of the pipe to be lagged. For the second and subsequ
29、ent layers of a multi-layer component, the bore shall be the specified diameter of the mating inner layer. 6.2 The dimensions of the product supplied shall not deviate from those specified by more than the appropriate tolerances given in either Table 3 or Table 4. For slabs the permissible thickness
30、 deviations shall be 1.5mm. 7 Condition and appearance The material shall have a uniform fine cellular structure. NOTE 1In the case of moulded products there will normally be a skin which can vary in thickness. NOTE 2The condition, appearance and odour of the product may be agreed on the basis of an
31、 approved sample. 8 Sampling The frequency of sampling shall comply with the requirements of clause 3 of BS2972:1989. Where it is not possible to cut test specimens from the product, cut or moulded test pieces which shall be of the same formulation and density as the material supplied shall be used
32、(see Annex A). Table 2 Physical property requirements Physical property Type Method of test 1 2 3 4 Minimum compressive strength or compressive stress at10% strain, kPa 100 210 100 210 Annex C Dimensional stability: maximum percentage linear change Testconditions Annex D 24h at 15 C 2 C 1 1 1 1 24h
33、at 100 C 2 C 2 2 2 2 24h at 125 C 2 C 2 2 24h at 70 C 2 C 3 3 3 3 and 95 C 5 % r.h. Closed cell content: minimum apparent volume percentage 85 85 85 85 BS 4370-2:1993 method 10 Burning characteristics 1) : extentburnt, mm less than 125 less than 125 less than 25 less than 25 BS 4735:1974 Maximum wat
34、er vapour permeability at38 C and88% r.h., ng/(Pasm) 5.5 5.5 8.5 8.5 BS 4370-2:1993 method 8, condition a) CAUTION. The small-scale laboratory test described in BS4735 is solely for assistance in monitoring consistency of production and is not a means of assessing the potential fire hazard of a mate
35、rial is use (see Annex E).BS 5608:1993 BSI 07-1999 3 9 General requirements 9.1 Pipe sections 9.1.1 Pipe sections shall be supplied in two semicircular pieces; the longitudinally mating faces shall be flat and in the same plane, so that when the two pieces are put together no gaps exist between the
36、mating surfaces. NOTEIt is common practice for the mating faces whilst still being flat in the lengthwise direction to have a variable profile in the radial direction. This is acceptable provided that the mating surfaces so created still fit snugly together. In many cases this practice enhances the
37、“snugness” of the fit. 9.1.2 The ends shah be flat and normal to the longitudinal axis of the section. 9.2 Radiused and bevelled lags 9.2.1 The mating bevelled edges shall be flat, so that when they are put together to form a cylinder no gaps exist between abutting lags. 9.2.2 The ends shall be flat
38、 and normal to the longitudinal axis of the lag. NOTENo values are specified for their width on the outer and inner faces. 9.3 Moulded components All moulded items shall be free from grease or other moulding release agent that will adversely reduce the adhesion of insulation, mastics and adhesives.
39、9.4 Colour identification PIR foam shall be supplied coloured pink. PUR foam shall be supplied in any other colour or without added colour as required. 10 Marking The product, packages or invoice shall be marked with at least the following information. a) manufacturers name or trademark; b) product
40、designation as given in clause3 1) ; c) manufacturers description and/or product reference. Table 3 Dimensional tolerances for pipe sections and lags Table 4 Dimensional tolerances for slabs 1) Marking BS5608:1993 on or in relation to a product represents a manufacturers declaration of conformity, i
41、.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 is not to be confused with third party certification of conformity, which may also be desirable. Dimensions in
42、millimetres Dimensions Permissible deviations Moulded pipe sections Cut pipe sections and lags Lengths 3 3 Bores less than 150 Bores 150 and above Outside diameters less than 150 Outside diameters 150 and above NOTEFor single-layer components or the first layer of a multi-layer component the toleran
43、ce on the bore is given on the quoted pipe outside diameter. For the second or subsequent layer(s) of multi-layer components it is given on the outside diameter of the mating inner layer. Lengths or widths Permissible deviations of lengths or widths Maximum differences in the lengths of the diagonal
44、s of rectangular slabs Up to and including100 1 3 Over 100 up to and including 1000 1.5 5 Over 1000 up to and including 2000 2.5 7 +1.5 0 +1.5 0 +3 0 +1.5 0 +1.5 0 +1.5 0 + 3 0 +1.5 0BS 5608:1993 4 BSI 07-1999 Annex A (normative) Method of preparation of a moulded flat test piece If it is not possib
45、le to cut test pieces from the product, use a mould with internal dimensions of460mm 460mm 60mm. A mould constructed of two flat metal plates separated by a framework of four square sectional battens, with small vents at the corners, is recommended. Treat the inside of the mould with a suitable rele
46、ase agent to facilitate the release of the moulding. Preheat the mould to a suitable temperature. Into the middle of the mould place the amount of unfoamed chemical calculated to give a density equal to that of the final product and immediately close the mould. Release the mould and remove the produ
47、ct after the required mould residence time has elapsed. Annex B (informative) Guidance on thermal conductivity design and3day values In addition to the30day maximum thermal conductivity value which forms the specification value for the purposes of this standard, two related maximum thermal conductiv
48、ity values have practical importance, and should be obtained for the product from the manufacturer as follows. a) Design value of thermal conductivity.This 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
49、or equal to the30day value. b) The 3 day value of thermal conductivity.This value is often used in manufacturing control operations, to ensure the quality of product is regularly maintained. Generally it will be lower than or equal to the30day value. Annex C (normative) Method of test for compression characteristics Carry out the test in accordance with method3 (clause 3) of BS4370-1:1988 on test pieces from which moulded skins have been removed. For all products carry out determination
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