의미와 용도
5.1 Tests conducted in accordance with this practice are designed to cause changes in properties associated with exposure to light and heat used in typical office environments. These exposures are not intended to simulate deterioration caused by local phenomena such as handling, fouling, 기타.
노트 5: Please refer to Practice G151 for the complete warning guidelines applicable to all laboratory aging equipment. For additional information on sources of variability and strategies to address variability through the design and data analysis of laboratory accelerated exposure tests, see Guideline G141.
5.2 Results may vary between the different methods described in this practice. 예를 들어, differences in the spectral distribution of the lamps used and changes in the irradiance of a single type of lamp can lead to significant differences in test results. 그러므로, reference to this practice should not be made unless accompanied by a report prepared under section 12 describing the need to refer to the methodology used.
5.3 The reproducibility of test results between laboratories has been shown to be good when evaluating the stability of a material according to its performance class compared to other materials or controls. 그러므로, it is strongly recommended to expose similar materials with known properties (controls) 시험자료와 동시에. At least three repetitions of each material are recommended to enable statistical evaluation of the results.
ASTM D4674-2019 Standard Practice for Accelerated Testing of Color Stability of Plastics Exposed to Indoor Office Environments
반지름
1.1 This practice covers the rationale and operating procedures for using fluorescent lighting to determine the color stability of plastics when exposed to materials in a typical office environment using fluorescent overhead lighting and Windows to filter daylight, where temperature and humidity conditions meet the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommendations for worker comfort.
1.2 This practice describes four methods in which specimens are exposed to fluorescence under controlled environmental conditions. Two of these methods use exposure devices that provide fluorescent lamp mixing, and two of them use devices that comply with Practice G154.
노트 1: Method I uses cold white fluorescent lamps and window glass to filter fluorescent UVB lamps as described in previous versions of this standard.
1.3 Sample preparation and result evaluation are covered in ASTM methods or specifications for specific materials. General guidance is given in Practice G151. More specific information is described in Practice D5870 about methods for determining post-exposure characteristic changes and reporting these results.
1.4 SI 단위로 표현된 값은 표준으로 간주됩니다..
ASTM D4674-2019 Standard Practice for Accelerated Testing of Color Stability of Plastics Exposed to Indoor Office Environments
1.5 All sizes are nominal unless otherwise stated.
1.6 이 표준은 모든 안전 문제를 해결하기 위한 것이 아닙니다., 만약에 어떠한, 그 사용과 관련된. 적절한 안전을 확립하는 것은 이 표준 사용자의 책임입니다., 건강 및 환경 관행을 확인하고 사용 전 규제 제한의 적용 여부를 결정합니다.. See Section 7 for specific precautions.
노트 2: There is no known ISO equivalent to this standard.
1.7 이 국제 표준은 국제 표준 개발 원칙에 관한 결정에서 확립된 국제적으로 인정된 표준화 원칙을 기반으로 합니다., 세계무역기구(WTO) 무역기술장벽위원회가 발행한 지침 및 권고사항.