ASTM D4674 暴露在室内办公室环境下的塑料颜色稳定性加速试验的标准实施规范（暴露在室内荧光灯和透窗入室日光下的塑料颜色稳定性加速试验的标准试验方法）

ASTM D4674-2002发行信息

标准号ASTM D4674-2002a(2010)

中文名 暴露在室内荧光灯和透窗入室日光下的塑料颜色稳定性加速试验的标准试验方法

英文名 Standard Practice for Accelerated Testing for Color Stability of Plastics Exposed to Indoor Office Environments

发布日期2002

实施日期

废止日期无

中国标准分类号G31

国际标准分类号83.080.01

发布单位US-ASTM

代替标准No Replacement

ASTM D4674-2002适用范围

根据本实施规程进行的试验旨在引起与典型办公环境中的光照和热暴露相关的性能变化。这些暴露不是为了模拟局部现象（如搬运、污垢污染等）造成的劣化。

附注58212；警告：警告：有关适用于所有实验室风化装置的完整警告指南，请参考规程G151。关于可变性来源以及通过实验室加速暴露试验的设计和数据分析解决可变性的策略的更多信息，请参见指南G141。

本实施规程中描述的不同方法之间可能存在结果差异。例如，所用灯具光谱分布的差异和单个灯具辐照度的变化可能导致试验结果的显著差异。因此，除非附有根据第12节编制的报告，说明需要包括对所用方法的引用，否则不得提及本惯例的使用。

当根据与其他材料或对照物相比的性能等级评估材料的稳定性时，实验室间试验结果的再现性已被证明是良好的。因此，强烈建议在试验材料的同时暴露具有已知性能的类似材料（对照）。建议对每种材料至少进行三次重复，以便对结果进行统计评估。

Tests conducted in accordance with this practice are intended to induce property changes associated with use exposure to light and heat in typical office environments. These exposures are not intended to simulate the deterioration caused by localized phenomena such as handling, dirt contamination, etc.

Note 58212;Caution: Caution: Refer to practice G151 for full cautionary guidance applicable to all laboratory weathering devices. Additional information on sources of variability and on strategies for addressing variability by design and data analysis of laboratory accelerated exposure tests is found in Guide G141.

Variation in results may be expected are possible between the different methods described in this practice. For example, differences in spectral distribution of the lamps used and variations in the irradiance for a single type of lamp can cause significant differences in test results. Therefore, any no reference to the use of this practice should be made unless accompanied by a report prepared in accordance with Section 12 that describes needs to include a reference to the method used.

Reproducibility of test results between laboratories has been shown to be good when the stability of materials is evaluated in terms of performance ranking compared to other materials or to a control. Therefore, exposure of a similar material of known performance (a control) at the same time as the test materials is strongly recommended. It is recommended that at least three replicates of each material be exposed to allow for statistical evaluation of results.

1.1 This practice covers the basic principles and operating procedures for using fluorescent light to determine color stability of plastics when materials are exposed in typical office environments where fluorescent overhead lighting and window-filtered daylight are used for illumination and where temperature and humidity conditions are in accordance with American Society of Heating, Refrigerating, and Air-conditioning Engineers (ASHRAE) recommendations for workers'' comfort.

1.2 This practice describes four methods where specimens are exposed to fluorescent light under controlled environmental conditions. Two of the methods use an exposure device that provides for mixing of fluorescent lamps and two of the methods use devices that comply with Practice G154.

Note 18212;Method I uses cool white fluorescent lamps and window glass filtered fluorescent UVB lamps and is the same method described in previous versions of this standard.

1.3 Specimen preparation and evaluation of the results are covered in ASTM methods or specifications for specific materials. General guidance is given in Practice G151. More specific information about methods for determining the change in properties after exposure and reporting these results is described in Practice D5870.

1.4 The values stated in SI units are to be regarded as the standard.

1.5 Unless otherwise specified, all dimensions are nominal.

1.6 This practice may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, is any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practi......