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1、Plastics Methods of exposure to laboratory light sources Part 2:Xenon-arc lamps塑料-实验室光照老化测试 第二部分-氙弧灯1 ScopeThis part of ISO 4892 specifies methods for exposing specimens to xenon-arc light in the presence of moisture to reproduce the weathering effects (temperature, humidity and/or wetting) that occ
2、ur when materials are exposed in actual end-use environments to daylight or to daylight filtered through window glass.此ISO 4892标准中介绍了将试样暴露在氙灯及雨淋环境中，通过模仿自然光或有窗户玻璃过滤状态下的自然环境，以确定终端客户在使用材料时受到自然气候的影响（温度，湿度/或受潮）。Specimen preparation and evaluation of the results are covered in other International Standard
3、s for specific materials. 特殊材料试样的制备以及结果评价参考其他国际标准。General guidance is given in ISO 4892-1.通则见ISO 4892-1NOTE Xenon-arc exposures of paints and varnishes are described in ISO 11341.注：涂料及清漆的氙灯老化见ISO 113412 Normative referencesThe following documents, in whole or in part, are normatively referenced in t
4、his 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 af
5、ter exposure to daylight under glass, natural weathering or laboratory light sourcesISO 4892-1, Plastics Methods of exposure to laboratory light sources Part 1: General guidanceISO 9370, Plastics Instrumental determination of radiant exposure in weathering tests Generalguidance and basic test method
6、3 Principle3 原理3.1 A xenon arc, fitted with filters, is used to simulate the relative spectral irradiance of daylight in the ultraviolet (UV) and visible regions of the spectrum.3.1 配置了合适的滤光器的氙弧灯，其产生的辐射类似于地面日光的紫外和可见区的光谱能量分布。3.2 Specimens are exposed to various levels of light, heat, relative humidit
7、y and water (see 3.4) under controlled environmental conditions.3.2 将试样暴露于不同水平的光线，热度，相对湿度以及水淋等受控的环境条件下3.3 The exposure conditions are varied by selection ofa) the light filter(s);b) the irradiance level;c) the temperature during exposure to light;d) the relative humidity in the chamber during light
8、and dark exposures, when exposure conditions requiring control of humidity are used;e) the way the test specimens are wetted (see 3.4);f) the water temperature and wetting cycle;g) the relative lengths of the light and dark periods.3.3 暴露的条件可有多种选择：a）滤光器b）辐射等级c）光照时的温度d）当暴露条件要求控制湿度时，测试箱在日光及无光照射时的相对湿度e
9、）试样加湿的方式f）水浴温度计加湿循环周期g）光照及非光照的周期时长3.4 Wetting is produced by spraying the test specimens with demineralized/deionized water, by immersion in water or by condensation of water vapour onto the surfaces of the specimens.试验片的加湿是通过喷射去矿物水/去离子水，浸入水中或在试样表面冷凝水汽来实现的。3.5 The procedure includes measurements of
10、the UV irradiance and UV radiant exposure in the plane of the specimens.3.5 程序应包含测量试验片平面上受到的UV辐射度及UV辐射曝量。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.3.6 建议同时放置一个已知性能的材料
11、用做测试样品的比对标准。3.7 Intercomparison of results obtained from specimens exposed in different apparatus should not be made unless an appropriate statistical relationship has been established between the apparatuses for the particular material exposed.3.7 试样暴露于不同的装置得到的结果可相互比较，4 Apparatus4.1 Laboratory ligh
12、t source 实验光源4.1.1 GeneralThe light source shall comprise one or more quartz-jacketed xenon-arc lamps which emit radiation from below 270 nm in the ultraviolet through the visible spectrum and into the infrared. 4.1.1 石英套管的氙弧灯的光谱范围包括波长大于270nm的紫外光、可见光和红外辐射In order to simulate daylight, filters shall
13、be used to remove short-wavelength UV radiation (method A, see Table 1). 为了模拟直接的自然暴露，辐射光源必须过滤，以便提供与地球上的日光相似的光谱能量分布（方法A，将表1）Filters to minimize irradiance at wavelengths shorter than 310 nm shall be used to simulate daylight through window glass (method B, see Table 2). 采用可减少波长310nm以下光谱福照度的滤光器来模拟透过窗户
14、玻璃绿光后的日光（方法B，见表2）In addition, filters to remove infrared radiation may be used to prevent unrealistic heating of the test specimens, which can cause thermal degradation not experienced during outdoor exposures.总之，当加热试样对光化学反应速度有不利影响，或在自然暴露下并不会引起热老化时，可以使用附加的滤光器来减少非光化作用的红外能量。NOTE Solar spectral irradia
15、nce for a number of different atmospheric conditions is described in CIE Publication No. 85. The benchmark daylight used in this part of ISO 4892 is that defined in Table 4 in CIE No. 85:1989.注：一些列不同大气环境下日光光谱福照度在CIE No.85中有进行刊登。本标准ISO 4892中使用的日光基准见CIE No.85:1989表4规定。4.1.2 Spectral irradiance of xeno
16、n-arc lamps with daylight filters4.1.2 经过日光滤光器的氙弧灯光谱辐照度Filters are used to filter xenon-arc emissions in order to simulate daylight (CIE Publication No. 85:1989,Table 4). The minimum and maximum levels of the relative spectral irradiance in the UV wavelength range are given in Table 1 (see also Annex A).为模仿自然光需使用滤光器来过滤氙弧光谱（CIE No.85:1898表4）。紫外光谱的
