ASTM G90-2017测试标准

ASTM G90 以聚集自然光源方法对非金属材料进行加速室外老化测试

ASTM G90-2017发行信息

标准号ASTM G90-2017

中文名 用集中自然阳光光线法加速实施对非金属材料的室外风蚀的标准实施规程

英文名 Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight

发布日期2017

实施日期

废止日期无

中国标准分类号H25

发布单位US-ASTM

ASTM G90-2017适用范围

1.1 Fresnel-reflecting concentrators using the sun as source are utilized in the accelerated outdoor exposure testing of materials.

1.2 This practice covers a procedure for performing accelerated outdoor exposure testing of materials using a Fresnel-reflector accelerated outdoor weathering test machine. The apparatus (see Fig. 1 and Fig. 2) and guidelines are described herein to minimize the variables encountered during outdoor accelerated exposure testing.

1.3 This practice does not specify the exposure conditions best suited for the materials to be tested but is limited to the method of obtaining, measuring, and controlling the procedures and certain conditions of the exposure. Sample preparation, test conditions, and evaluation of results are covered in existing methods or specifications for specific materials.

1.4 The Fresnel-reflector accelerated outdoor exposure test machines described may be suitable for the determination of the relative durability of materials exposed to sunlight, heat, and moisture, provided the mechanisms of chemical or physical change, or both, which control the acceleration factors for the materials do not differ significantly.

1.5 This practice establishes uniform sample mounting and in-test maintenance procedures. Also included in the practice are standard provisions for maintenance of the machine and Fresnel-reflector mirrors to ensure cleanliness and durability.

1.6 This practice shall apply to specimens whose size meets the dimensions of the target board as described in 8.2.

1.7 For test machines currently in use, this practice may not apply to specimens exceeding 13 mm (1/2 in.) in thickness because cooling may be questionable.

1.8 Values stated in SI units are to be regarded as the standard. The inch-pound units in parentheses are provided for information only.

1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

1.1使用太阳作为光源的菲涅耳反射聚光器用于材料的加速室外暴露试验。

1.2本规程涵盖了使用菲涅耳反射器加速室外风化试验机对材料进行加速室外暴露试验的程序。本文描述了装置（见图1和图2）和指南，以最小化室外加速暴露试验期间遇到的变量。

1.3本规程未规定最适合待测材料的暴露条件，但仅限于获取、测量和控制暴露程序和特定条件的方法。特定材料的现有方法或规范涵盖了样品制备、试验条件和结果评估。

1.4所述菲涅耳反射器加速户外暴露试验机可适用于测定暴露在阳光、热量和水分下的材料的相对耐久性，前提是控制材料加速系数的化学或物理变化机制或两者没有显著差异。

1.5本规程建立了统一的样品安装和试验维护程序。本规程还包括维护机器和菲涅耳反射镜的标准规定，以确保清洁度和耐用性。

1.6本规程应适用于尺寸符合8.2所述目标板尺寸的试样。

1.7对于目前使用的试验机，本规程可能不适用于厚度超过13 mm（1/2 in.）的试样，因为冷却可能有问题。

1.8以国际单位制表示的数值应视为标准。括号中的英寸-磅单位仅供参考。

1.9本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。

1.10本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。