BS-7619-1993.pdf

BRITISH STANDARD BS 7619:1993 Specification for Extruded cellular unplasticized PVC (PVC-UE) profiles Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 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 April 1993 © BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PRM/34 Draft for comment 91/38654 DC ISBN 0 580 22020 6 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/34, upon which the following bodies were represented: British Plastics Federation British Rubber Manufacturers Association Packaging and Industrial Films Association SATRA Footwear Technology Centre Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 © BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordii Introduction1 1Scope1 2References1 3Definitions1 4Composition1 5Designation1 6Product types1 7Dimensions and dimensional tolerances1 8Performance2 9Marking3 Annex A (informative) Recommendations for designers and installers using cellular PVC-UE products4 Annex B (normative) Method of test for colour fastness4 Annex C (normative) Method of test for flatness5 Annex D (normative) Method of test for bowing in the length of the profile6 Annex E (normative) Method of test for impact resistance6 Annex F (normative) Method of test for ultraviolet aged impact resistance7 Annex G (normative) Method of test for water absorption7 Figure C.1 Product flatness measuring device5 Figure D.1 Schematic representation of bowing6 Table 1 Product types and fire requirements1 Table 2 Tolerances for thickness and width of extruded profiles2 Table 3 Other physical properties2 Table 4 Requirements for bowing3 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 ii © BSI 07-1999 Foreword This standard has been prepared under the direction of the Plastics and Rubber Standards Policy Committee of the British Standards Institution from a draft submitted by the British Plastics Federation. It details the requirements of products according to their fire performance identifying three types of products with respectively class 1, class 2 and class 3 surface spread of flame characteristics and which in the main are used in/or on buildings. 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 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 8, 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. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 © BSI 07-19991 Introduction Cellular PVC-UE products are primarily used as an alternative to traditional building products in a variety of applications for example: claddings, fascias and decorative finishing trims. The products are characterized by a high stiffness to weight ratio due to the simultaneous formation during extrusion of a denser outer skin encapsulating a rigid closed cellular core. This relationship between the thickness and density of the outer skin and the density of the closed cellular core can be varied to obtain products with differing performance characteristics. The expansion of the core during extrusion derives from the use of either physical or chemical expanding agents. Limited maintenance is necessary and they are easy to work and install (see Annex A). 1 Scope This standard describes the requirements of mono and co-extruded cellular PVC-UE profiles for non-structural building applications, where they are subjected to surface temperatures not exceeding 50 °C. Sheet and pipe products are not covered by this standard. 2 References 2.1 Normative references This British Standard 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 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 Standard 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 Definitions For the purposes of this British Standard, the following definitions apply. 3.1 external applications applications where the products will be exposed directly to climatic conditions 3.2 nominal values typical property values for the product 3.3 extruded profiles products, usually of non-uniform cross section, of width less than or equal to 750 mm 4 Composition The material from which the products are made shall consist of polyvinyl chloride to which has been added minor quantities of those additives and pigments that are needed for the manufacture of the compositions and their subsequent extrusion into products meeting the requirements described in this standard. Experience has shown that products normally need to be white to reach the characteristic performance levels of the applications. 5 Designation The products shall be designated by the following information presented in the following order. a) The number and date of this British Standard, i.e. BS 7619:1993. b) The type selected from those given in Table 1. For example a type 3 product shall be classified BS 7619:1993: Type 3. Table 1 Product types and fire requirements 6 Product types The products shall be classified in three types, according to fire property requirements as given in Table 1. 7 Dimensions and dimensional tolerances 7.1 Measurement of dimensions Dimensions shall be measured using the appropriate method selected from methods 1A, 1B and 1C of BS 4370-1:1988. 7.2 Permissible deviations for width and thickness of extruded profiles The permissible deviations for thickness and width shall be in accordance with Table 2. TypesFire requirements Surface spread of flame classification Test Method 1Class 1BS 476-7:1987 2Class 2BS 476-7:1987 3Class 3BS 476-7:1987 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 2 © BSI 07-1999 Table 2 Tolerances for thickness and width of extruded profiles 7.3 Length Product length shall be not less than that stated by the manufacturer. 7.4 Permissible deviations for weight per metre The weight per metre shall be within ± 12.5 % of the manufacturers stated nominal values (see 3.2). 8 Performance 8.1 Colour fastness and weathering resistance of white profiles When tested in accordance with Annex B, the maximum colour change shall not exceed 3-4 on the grey scale as specified in BS 1006:A03:1978. NOTEThe maximum permitted colour difference when assessed by instrumental measurement in accordance with BS 3900-D8:1986, BS 3900-D9:1986 and BS 3900-D10:1986 should not exceed 7.0 CIELAB colour difference units. Any samples which, though they have developed acceptable colour difference, show surface erosion with the development of loose pigment (chalking) shall be deemed to be unacceptable. 8.2 Fire performance The products shall have a surface spread of flame rating of either 1, 2 or 3 when tested in accordance with BS 476-7:1987. 8.3 Surface finish The profile shall be free from visible foreign bodies, cracks or sink marks when viewed by normal and corrected vision at 90 ° to the surface from a distance of 1 m in normal diffused north light. NOTEThe colour of the individual profile shall be uniform and the colour of the profiles in a system shall be uniform. 8.4 Other physical properties The products shall conform with the requirements given in Table 3, when tested by the methods given therein. Table 3 Other physical properties WidthThicknessPermissible deviations mmmmmm 0 to 50 51 to 150 151 to 250 251 to 350 U351 5 to 12 12 ± 0.5 ± 0.75 ± 0.5 ± 1.0 ± 1.50 ± 2.0 ± 3.0 PropertyRequirementTest Method FlatnessOver any 100 mm distance along the surface between any two points the deviation shall not exceed ± 0.6 mm Annex C BowingSee Table 4Annex D Impact resistanceNone of the specimens shall fail when droppedAnnex E UV aged impact resistance None of the specimens shall fail when droppedAnnex F Maximum water absorption Weight increase not greater than 1 %Annex G Maximum linear thermal expansion Not greater than 7 ×105/°C Method 13 of BS 4370-3:1988 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 © BSI 07-19993 9 Marking Products or packages shall be marked or labelled with at least the following information. a) The manufacturers name or trademark; b) The product designation as given in clause 5; c) The manufacturers description and/or product reference Table 4 Requirements for bowing Product length m Maximum bowing mm k25 2 to 39 3 to 416 4 to 525 5 to 636 6 to 749 764 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 4 © BSI 07-1999 Annex A (informative) Recommendations for designers and installers using cellular PVC-UE products A.1 General Cellular PVC-UE is manufactured by a process of extruding an expanding PVC-UE material, cooling and forming it to section and finally cutting to length. Expansion of the PVC-UE material is achieved without the use of chlorofluorocarbons (CFCs). The products require limited maintenance which is confined to periodic washing for the sake of cosmetic appearance. Cellular PVC-UE products offer a degree of thermal insulation and good resistance to most acids and alkalis, sea water, insects and atmospheric pollution. Cellular PVC-UE products are resistant to dry/wet rot and fungus. A.2 Working practices Cellular PVC-UE products are easy to work using normal hand tools for cutting, drilling and shaping. Handsaws should have a fine toothed blade. Experience has shown that the use of drills and saws with straight or negative tips are particularly suitable for machining cellular PVC-UE products. Cellular PVC-UE products should always be cut and never broken. Eye protection and a coarse particle dust mask should be worn when machining products with power tools. Light industrial gloves should also be worn when handling cellular PVC-UE products. A.3 Installation It is essential that the installation of the products should be carried out in accordance with the manufacturers instructions and any relevant current British Standards or Codes of Practice. A.4 Maintenance As cellular PVC-UE is a finished material, overpainting is not necessary. Cleaning may be carried out, if required, using a clean cloth and a solution of detergent diluted to the normal concentration. Where possible flood the PVC-UE product taking care not to abrade the surface when removing dirt. Internal surfaces should be polished with a colourless silicone furniture polish if required. Particularly stubborn marks should be removed using a mild household non-scouring cream followed by washing. A.5 Transportation, handling and storage Loading and unloading from vehicles should be carried out by hand (except where preloaded into special transport containers) to avoid damage to components. Storage in the products protective packaging should be on a level firm surface and stacked less than 1 m in height in such a way as to prevent collapse. A.6 Environmental information PVC-UE product off-cuts should be removed from site because they will not decompose. They should not be burned on site. Off-cuts can be safely disposed of in land fill sites as directed by the supplier, or can be recycled as advised by the raw material supplier. Alternatively, PVC-UE products can be incinerated without environmental risk, in correctly operated incinerators. NOTEUsers should seek advice from their supplier on these aspects. Annex B (normative) Method of test for colour fastness B.1 Principle Test specimens are subjected to a specified regime of weathering and the change in colour determined. B.2 Apparatus B.2.1 A weathering apparatus conforming to BS 2782-5:Method 540B:1982 fitted with a xenon arc lamp with filters which provide the nearest spectral distribution of incident radiation to that specified for simulated solar radiation given in Annex C of BS 2782-5:Method 540B:1982, but with any irradiance below 300 nm not exceeding 1 W·m2. NOTEPrecise matching of this distribution is not currently attainable. Particular emphasis should be given to matching the wavelength range 300 nm to 400 nm. B.3 Test specimens Prepare 10 test specimens as described in E.3. B.4 Procedure Expose five test specimens to a total irradiation of 8 GJ/m2, integrated over the wavelength 300 nm to 890 nm, with a water spray cycle of 5 min on and 25 min off and a relative humidity of 65 % ± 5 % during the dry period. There shall also be a maximum black panel temperature at the end of the dry period of 45 °C ± 3 °C. NOTEThe irradiation may be determined by use of appropriately calibrated integrating detectors placed in the plane of the test specimens where available. Otherwise the duration of exposure should be computed from the manufacturers design irradiance for the stated wavelength range appropriate to the lamps, wattage schedule and filters employed. The total time of exposure to the lamps will normally fall within the range 2 250 h ± 500 h. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:33:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7619:1993 © BSI 07-19995 Retain the other five test specimens as unexposed reference test specimens. B.5 Assessment of changes Assess the colour difference between exposed and unexposed test specimens as soon as possible after completion of the exposure period and also at at least three uniformly