의미와 용도
4.1 화학물질의 상대적으로 급속한 악화, physical and mechanical properties of materials made from photodegradable plastics when exposed to light, heat and water after achieving their intended purpose. This practice is designed to cause changes in properties related to the conditions the material may encounter when discarded as garbage, including the effects of sunlight, 수분, and heat. The exposures used in this practice are not intended to simulate deterioration caused by local weather phenomena such as atmospheric pollution, 생물학적 공격, 그리고 바닷물 노출.

4.2 지침 – When operating conditions vary within the acceptable limits of this practice, results can be expected to change. 그러므로, reference to the use of this practice must not be made unless accompanied by a report prepared in accordance with section 9 describing the specific operating conditions used. For more information about the precautions that apply to using results obtained under this practice, see Practice G151.

메모 2: 가변성의 원인과 설계의 가변성을 해결하기 위한 전략에 대한 추가 정보, 실행, and data analysis of laboratory accelerated exposure trials, see Guideline G141.

ASTM D5208-2022 형광 자외선에 대한 표준 실습

4.3 Simultaneous exposure to similar materials with known properties (통제 수단) with the sample provides criteria for comparison purposes. The use of controls to rank the stability of test materials greatly improves consistency across different laboratories. It is recommended that at least three repetitions of the material for each evaluation be performed in order to statistically evaluate the results.

4.4 테스트 결과는 G154 실습에 따라 장비를 작동하는 데 주의를 기울인 정도에 따라 달라집니다.. Important factors include regulation of the line voltage, the temperature of the room in which the equipment is operating, 온도 제어, and the condition and age of the lamp (if exposed in equipment without irradiance control).

반지름
1.1 This procedure covers specific procedures applicable to fluorescent ultraviolet (자외선) irradiation of photodegradable plastics in accordance with procedures G151 and G154. The practice also includes the preparation of test samples and the evaluation of test results.

1.2 Practice D4329 covers fluorescent UV exposure to plastics used for outdoor applications.

ASTM D5208-2022 형광 자외선에 대한 표준 실습

1.3 SI 단위로 표현된 값은 표준값으로 취급됩니다.. 괄호 안의 값은 참고용입니다..

1.4 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..

메모 1: There is no known ISO equivalent to this standard.

1.5 이 국제 표준은 국제 표준 개발 원칙에 관한 결정에서 확립된 국제적으로 인정된 표준화 원칙을 기반으로 합니다., WTO 무역기술장벽위원회가 발행한 지침 및 권고사항.