BS EN ISO 4892-3:2016 pdf free

BS EN ISO 4892-3:2016 pdf free.Plastics – Methods of exposure to laboratory light sources Part 3: Fluorescent UV lamps.
The following documents, in whole or in part. are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4582, Plastics — Determination of changes in colour and variations in properties after exposure to daylight under glass, natural weathering or laboratory light sources
ISO 4892-1, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance
3.1 Fluorescent UV lamps, when following the manufacturer’s recommendations for lamp maintenance and/or rotation, may he used to simulate the spectral irradiance of global solar radiation in the short wavelength ultraviolet (UV) region of the spectrum.
3.2 Specimens are exposed to various levels of UV radiation, heat and moisture (see 14) under controlled environmental conditions.
3.3 The exposure conditions may be varied by selection of the following:
a) type of fluorescent IJV lamp:
b) irradiance level;
c) temperature during the UV exposure:
d) type of wetting (see 14);
3.4 Wetting is usually produced by condensation of water vapour on to the exposed specimen surface or by spraying the test specimens with demineralized/deionized water.
3.5 The procedure(s) may include measurement of the irradiance and the radiant exposure in the plane of the specimen.
3.6 It Is recommended that a similar material of known performance (a control) be exposed simultaneously with the test specimens to provide a standard for comparative purposes.
3.7 Intercomparison of results obtained from specimens exposed in different types of apparatus or to different types of lamp should not be made unless an appropriate statistical relationship has been established between the different types of equipment for the material to be tested.
4 Apparatus
4.1 Laboratory light source
4.1.1 Fluorescent tJV lamps are fluorescent lamps in which radiant emission in the ultraviolet region of the spectrum. i.e. below 400 nm, makes up at least 80 % of the total light output. There are three types of fluorescent (IV lamp used in this part of ISO 4892.
— UVA-340 (type IA) fluorescent (IV lamp: these lamps have a radiant emission below 300 nm of less than 1 % of the total light output, have an emission peak at 343 nm, and are more commonly identified as UVA-340 for simulation of global solar radiation from 300 nm to 340 nm (see Table 1). Figure A.1 is a graph of spectral irradiance from 250 nm to 400 nm of a typical LJVA-340 (type 1A) fluorescent lamp compared to global solar radiation.
— UVA-351 (type IB) fluorescent LIV lamp: these lamps have a radiant emission below 310 nm of less than 1 % of the total light output, have a peak emission at 353 nm, and are more commonly identified as UVA-351 for simulation of the Liv portion of solar radiation behind window glass (see Tablc2). FigureA2 is a graph of spectral irradiance from 250 nrn to 400 nm of a typical UVA-351 (type 18) fluorescent UV lamp compared to global solar radiation filtered by window glass.
— IJVB-313 (type 2) fluorescent LIV lamp: these lamps are more commonly identified as UVB-313
and have a radiant emission below 300 nm that is more than 10 % of the total output and a peak
emission at 313 nm (see Table 3). FigureA. Is a graph of the spectral irradiance from 250 nm to
400 nm of two typical UVB.313 (type 2) fluorescent lamps compared to global solar radiation. LJVB313 (type 2) lamps may be used only by agreement between the parties concerned. Such agreement
shall be stated in the test report.
— Four different (IV lamps used as one combination: these four different Liv lamps are used together as one combination with a suited filter. See I:igure A.4 in A.2.3.BS EN ISO 4892-3 pdf free download.