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ASTM D523-2008 镜面光泽度的标准试验方法

ASTM D523-2008 镜面光泽度的标准试验方法

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【英文标准名称】: Standard Test Method for Specular Gloss
【原文标准名称】: 镜面光泽度的标准试验方法
【标准号】: ASTM D523-2008
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: E12.03
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】:
【英文主题词】: appearance; directional reflectance factor; gloss; goniophotometry; high gloss; relative luminous reflectance factor; specular gloss; Appearance of materials; Directional reflectance; Gloss; Goniophotometry; High-gloss surfaces; Latex paints; Relative lu
【摘要】: Gloss is associated with the capacity of a surface to reflect more light in directions close to the specular than in others. Measurements by this test method correlate with visual observations of surface shininess made at roughly the corresponding angles. Measured gloss ratings by this test method are obtained by comparing the specular reflectance from the specimen to that from a black glass standard. Since specular reflectance depends also on the surface refractive index of the specimen, the measured gloss ratings change as the surface refractive index changes. In obtaining the visual gloss ratings, however, it is customary to compare the specular reflectances of two specimens having similar surface refractive indices. Other visual aspects of surface appearance, such as distinctness of reflected images, reflection haze, and texture, are frequently involved in the assessment of gloss (1), (6), (7). Test Method E 430 includes techniques for the measurement of both distinctness-of-image gloss and reflection haze. Test Method D 4039 provides an alternative procedure for measuring reflection haze. Little information about the relation of numerical-to-perceptual intervals of specular gloss has been published. However, in many applications the gloss scales of this test method have provided instrumental scaling of coated specimens that have agreed well with visual scaling (10). When specimens differing widely in perceived gloss or color, or both, are compared, nonlinearity may be encountered in the relationship between visual gloss difference ratings and instrumental gloss reading differences. 1.1 This test method covers the measurement of the specular gloss of nonmetallic specimens for glossmeter geometries of 60, 20, and 85x00B0; (1-7). 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
【中国标准分类号】: Y89
【国际标准分类号】: 83_140_01
【页数】: 5P.;A4
【正文语种】: 英语

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