bsen14836-20xxsyntheticsurfacesforoutdoorsportsareasexposuretoartificialweathering-文庫(kù)吧資料
2024-09-13 11:40本頁(yè)面
【正文】 ion from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, an d size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright amp。C. If sample wetting is by condensation, allow at least 120 min per interval to ensure attainment of equilibrium. This time does not form part of the exposure cycle. 6 Specimens Specimens shall be of the size specified by the test methods for the properties to be measured after exposure, as detailed in the relevant product specification. 7 Procedure Mount the specimen without strain in the specimen holders with the test surface facing the lamps. Fill any spaces, using blank panels, to ensure uniform exposure conditions. Expose the specimen, measuring the irradiance and radiant exposure at the surface of the specimen. After an exposure of (4 896 177。 2) min of condensation exposure, without radiation, at a blackpanel temperature of (45 177。 3) 176。s instructions on the procedure necessary to maintain the desired irradiance should be followed. NOTE 2 The use of UVB fluorescent UV lamps or exposure in a xenon arc artificial weathering cabi is remended when developing or assessing products intended for installation in environments where high levels of UV exposure might be expected. b) Exposure chamber, constructed from inert material and that provides uniform irradiance in accordance with item a) and that includes a means of controlling the temperature. c) Wetting mechanism, either condensation or water spray, to wet the exposed face of the specimen. In apparatus designed to wet the exposed faces of the specimens by means of a humiditycondensing mechanism, the water vapour shall be generated by heating water in a container located beneath and extending across the whole area occupied by the specimens. Specimen holders (pletely filled with specimens) shall constitute the sidewall of the exposure chamber, so that the backs of the specimens are EN 14836:2020 (E) 5 Licensed Copy: sheffieldun sheffieldun, na, Tue Oct 31 08:07:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI exposed to the cooling effect of the ambient room air. If wetting is provided by spraying the specimens, the water shall conform to EN ISO 48922:1999, . d) Radiometer, conforming to EN ISO 48921:2020, , to monitor irradiance and radiant exposure. e) Blackpanel thermometer, conforming to EN ISO 48921:2020, . f) Specimen holders, made from inert materials that will not affect the results of the exposure. The holders shall be mounted so that the exposed face of the specimen is located in accordance with the manufacturer’s instructions, and shall be no more than 50 mm from the UV lamp bank plane. 5 Exposure conditions The exposure cycle shall prise (240 177。 R NOR M UNG Management Centre: rue de Stassart, 36 B1050 Brussels 169。E N DE NOR M A L I S A T I O N EUR O P 196。nstliche Bewitterung This European Standard
公司管理相關(guān)推薦
鄂ICP備17016276號(hào)-1