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1、BRITISH STANDARD BS EN 1297:2004 Flexible sheets for waterproofing Bitumen, plastic and rubber sheets for roof waterproofing Method of artificial ageing by long term exposure to the combination of UV radiation, elevated temperature and water The European Standard EN 1297:2004 has the status of a Bri
2、tish Standard ICS 91.100.50 BS EN 1297:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 December 2006 BSI 2006 ISBN 0 580 49848 4 National foreword This British Standard was published by BSI. It is the UK implementation of EN 1297:2004
3、. The UK participation in its preparation was entrusted by Technical Committee B/546, Flexible sheets for waterproofing and water vapour control, to Subcommittee B/546/2, Plastics and rubber sheets. A list of organizations represented on B/546/2 can be obtained on request to its secretary. This publ
4、ication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments W - - - - - - - - 777 - 777 -
5、 - 7-8- 7 - - 7 7 - 7 77 - - - $ $- - * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - W W D - - w - - - - EN 1297:2004 (E) 2 Contents Page Foreword3 Introduction.4 1 Scope 5 2 Normative references5 3 Terms and definitions .5 4 Principle6 5 Apparatus .6 5.1 Laboratory light sour
6、ce.6 5.2 Test Chamber.6 5.3 Specimen arrangement.6 5.4 Water supply and spray mechanism .6 5.5 Cycle timer7 5.6 Thermometer7 5.7 Radiometer.7 6 Sampling and preparation of test specimens.7 6.1 Sampling.7 6.2 Dimensions of test specimens.7 6.3 Preconditioning of specimens .7 7 Procedure .7 7.1 Genera
7、l7 7.2 Exposure cycle.7 7.3 Black standard temperature.7 7.4 Chamber heating7 7.5 Relative humidity.8 7.6 Procedure .8 8 Expression of results 8 9 Precision.8 10 Test report8 Annex A (informative) Spectral irradiance of fluorescent UV lamps type I (340 nm).9 Annex B (informative) Recommendations10 B
8、ibliography11 EN 1297:2004 (E) 3 Foreword This document (EN 1297:2004) has been prepared by Technical Committee CEN /TC 254, “Flexible sheets for waterproofing“, the secretariat of which is held by BSI. This standard is one of a series of standards, which specify test methods for determining dimensi
9、ons and characteristics of flexible sheets as factory made products. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2005, and conflicting national standards shall be withdrawn at the latest
10、 by March 2005. No existing European Standard is superseded. This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republ
11、ic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 1297:2004 (E) 4 Introduction This document has been prepared by
12、 CEN/TC 254 ”Flexible sheets for waterproofing” in order to test flexible bitumen, plastic and rubber sheets for roof waterproofing in relation to their ageing resistance to combined effects of long term exposure to UV radiation, elevated temperature and water. This document defines one common proce
13、dure to be applied as a method for artificial ageing to all types of flexible sheets for roof waterproofing This document has been drafted for applications in roofing but it may also be applied to other areas where it is relevant. EN 1297:2004 (E) 5 1 Scope This document specifies the method for exp
14、osure of factory made bitumen or plastic or rubber sheets for roof waterproofing to combined effects of long term exposure by UV radiation, elevated temperature and water as means of artificial ageing. 2 Normative references The following referenced documents are indispensable for the application of
15、 this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13416, Flexible sheets for waterproofing Bitumen, plastic and rubber sheets for roof waterproofing Rules for sampling EN
16、ISO 4892-1, Plastics Methods of exposure to laboratory light sources Part 1: General guidance (ISO 4892- 1:1999) EN ISO 4892-3, Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps (ISO 4892-3:1994) 3 Terms and definitions For the purposes of this document, the follo
17、wing terms and definitions apply. Symbol Unit 3.1 fluorescent UV lamp lamp in which primary radiation from a low pressure mercury arc is transformed into higher wavelength UV by means of a fluorescent phosphor. The spectral emission of a fluorescent lamp is determined by the spectral emission of the
18、 fluorescent phosphor and the transmission characteristics of the glass tube. A fluorescent UV lamp is a lamp in which the radiant emission in the ultraviolet region of the spectrum 400 nm makes up at least 80 % of the total radiation output 3.2 irradiance incident radiant flux onto a surface per un
19、it area E W / m 3.3 spectral irradiance radiant flux per unit area per wavelength interval E W/(m nm) 3.4 Radiant exposure time integral of irradiance H J/m 3.5 UV-radiation radiation with a wavelength between: 100 nm 400 nm nm EN 1297:2004 (E) 6 3.6 Exposed side side of the test specimen designated
20、 by the manufacturer to be exposed to the sunlight 4 Principle Test specimens cut from the product sample are exposed in an apparatus with fluorescent UV lamps at specified irradiance, black standard temperature (BST), relative humidity and cyclic water spraying. The resistance to this exposure is d
21、etermined by follow-up tests described in the product standards on flexible bitumen or plastic or rubber sheets for roof waterproofing. 5 Apparatus 5.1 Laboratory light source The UV source shall be an array of fluorescent UV lamps of type I (340 nm) or a fluorescent UV lamp combination in accordanc
22、e with EN ISO 4892-3 with a mean UV irradiance in the plane of the specimen surfaces of (45 5) W/m in the wavelength range 300 nm. For typical spectral irradiances see Figure A.1. The irradiance at the test specimen surface shall not vary more than 10 % in relation to any two points in the specimen
23、holder plane. In order to achieve homogeneous exposure conditions operate the apparatus according to the manufacturers instructions (e. g. replacement of lamps and repositioning of specimens) and use dummy specimens at void positions. 5.2 Test Chamber The design of the test chamber may vary but it s
24、hall be constructed from inert material and provide for uniform irradiance in accordance to 5.1 with means for controlling the black standard temperature (BST) and relative humidity in the dry period. 5.3 Specimen arrangement The test specimen racks shall allow the specimens to lie flat in the plane
25、 5 above the horizontal; be mounted so that the exposed face is in the plane of uniform irradiance. The specimens shall be attached to stainless steel platens of at least the same size as the specimens by appropriate means. The attachment shall leave an area open to free irradiation so that subseque
26、nt tests can be performed on irradiated parts of the specimen. For inclinations near to horizontal the specimens may be alternatively placed in stainless steel pans of at least the same size as the specimens. The specimens shall be weighted in this arrangement by means of a U shaped stainless frame.
27、 The external dimensions of the frame shall correspond to the specimen size. The cross section of the steel frame shall be (5 0,5) mm by approximately 10 mm. The dimension of (5 0,5) mm stands for the width of the cross section, i. e. the plane that is in contact with the specimen. If the specimens
28、are placed in pans, the lower end of the pans shall have sufficient slits or holes to avoid any collection of water. The attachment arrangement shall not restrain the test specimens from changes in dimensions during exposure. 5.4 Water supply and spray mechanism Demineralized water with a maximum co
29、nductivity of 500 S/m shall be used for spraying. In general the temperature of the water to be used in the spraying procedure shall be (25 5) C at the beginning of the spray cycle. Spray nozzles shall provide a uniform and continuous wetting of the exposed specimens sides for defined periods of tim
30、e. The flow rate through the nozzles shall be (10 3) litres per min and m of the exposed specimen surface. EN 1297:2004 (E) 7 5.5 Cycle timer A continuously operating cycle timer or controller shall allow programming of the spray cycles. An hour meter shall be provided to record total time of operat
31、ion and UV exposure. 5.6 Thermometer Thermometer capable of measuring the black standard temperature in accordance with EN ISO 4892-1, with means to record the temperature during each cycle. 5.7 Radiometer A radiometer to determine the UV radiant exposure in J/m in the wavelength region from 300 nm
32、to 400 nm. 6 Sampling and preparation of test specimens 6.1 Sampling For the purpose of this document, a complete undamaged roll of the sheet to be tested shall be selected in accordance with EN 13416. 6.2 Dimensions of test specimens Test specimens of sufficient size according to the follow-up test
33、 to be performed shall be cut from the test piece in accordance with EN 13416. The machine direction should be indicated. Durable marks for dimensional measurements before and after exposure shall be applied to the test specimens. 6.3 Preconditioning of specimens Appropriate preconditioning of the s
34、pecimens shall be carried out according to the tests to be performed as specified in the product standard on bitumen or plastic or rubber sheets. 7 Procedure 7.1 General The test specimens and the black standard thermometer shall be mounted in the specimen holders with their exposed sides facing the
35、 lamps (5.1). 7.2 Exposure cycle An exposure cycle has a duration of 360 min and consists of a 300 min dry period followed by a 60 min spray (wet) period in accordance with EN ISO 4892-3. Irradiation is not maintained during the wet period. 7.3 Black standard temperature The black standard temperatu
36、re (BST) shall be at (60 3) C during the dry period. The air temperature in the test chamber (5.2) shall be controlled to a constant value such that the black standard temperature (BST) equals the required value after 30 min in the dry period. 7.4 Chamber heating During the spray period the chamber
37、heating is turned off. EN 1297:2004 (E) 8 7.5 Relative humidity The relative humidity during the dry period shall be (10 5) % after 30 min of the dry period. 7.6 Procedure Operate continuously, repeating the programmed cycle, except for servicing the instrument and inspection of test specimens. NOTE
38、 1 The total amount of UV radiant exposure is specified in the relevant standards EN 13707and prEN 13956 (definitions and characteristics). Relevant recommendations are given in Annex B. NOTE 2 Eventual intermediate tests or observations are specified in the standards EN 13707and prEN 13956 (definit
39、ions and characteristics). Relevant recommendations are given in Annex B. 8 Expression of results Observe, compare and record the performance of test specimens unexposed and exposed regarding their visual change, mass change and crack formation. Any subsequent destructive tests shall be conducted ac
40、cording to the relevant product standards for Bitumen, plastic and rubber sheets for roof waterproofing. 9 Precision The precision is not specified by this standard. No report on international laboratory tests of repeatability or reproducibility is available. An accuracy statement will be added to t
41、he next revision when sufficient laboratory data, now in preparation, will be available. 10 Test report The test report shall include at least the following information: a) all details necessary to identify the product tested; b) a reference to this document (EN 1297:2004) and any deviation from it;
42、 c) information about the apparatus in accordance with Clause 5; d) information on sampling and details on preparation of test specimens in accordance with Clause 6; e) information on the test procedure in accordance with Clause 7 (7.1 to 7.5); f) the test results in accordance with Clause 8; g) dat
43、e of the test. EN 1297:2004 (E) 9 Annex A (informative) Spectral irradiance of fluorescent UV lamps type I (340 nm) Key (y-axis) spectral irradiance, in W/(m2 nm) (x-axis) wavelength, in nm Figure A.1 Spectral irradiance of fluorescent UV lamps type I (340 nm) EN 1297:2004 (E) 10 Annex B (informative) Recommendations B.1 Spray cycle The deionised water used in the spray cycles may be recycled. It should be