ASTM C609-07(2014) Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile

用于测量陶瓷片之间的光反射率值和小色差的标准测试方法

基本信息

标准号

ASTM C609-07(2014)

标准状态

历史

发布单位或类别

美国-美国材料与试验协会(US-ASTM);

发布日期

实施日期

废止日期

CCS分类

ICS分类

91.100.25 建筑材料 - 陶瓷和陶砖瓦建筑制品

研制信息

起草单位

- 展开▼

起草人

归口单位

C21.06

摘要

1.1 This test method covers the measurement of Light Reflectance Value (LRV) and visually small color difference between pieces of glazed or unglazed ceramic tile, using any spectrophotometer that meets the requirements specified in the test method. LRV and the magnitude and direction of the color difference are expressed numerically, with sufficient accuracy for use in product specification.1.2 LRV may be measured for either solid-colored tile or tile having a multicolored, speckled, or textured surface. For tile that are not solid-colored, an average reading should be obtained from multiple measurements taken in a pattern representative of the overall sample as described in9.2of this test method. Small color difference between tiles should only be measured for solid-color tiles. Small color difference between tile that have a multicolored, speckled, or textured surface, are not valid.1.3 For solid colored tile, a comparison of the test specimen and reference specimen should be made under incandescent, fluorescent and daylight illuminant conditions. The use of multiple illuminants allows the color difference measurement to be made without the risk of wrongly accepting a match when the tiles being compared are metamers. (See3.1.4.)1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.1.5This 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. ====== Significance And Use ======5.1 This test method describes the means of determining the LRV of a tile specimen. Certain building codes require the use of materials rated by LRV. Application of this test method provides the means for rating ceramic tile. LRVs reported for ceramic tile should include reference to the observer and illuminant for which the rating is valid.5.2 LRV is a property dependent on the overall color of a tile specimen. Control of LRV is achieved through control of color and adherence to color specifications will govern the acceptability of a product with respect to LRV. Therefore, a product cannot be judged as having an unacceptable LRV unless the color of the product is found to be unacceptable.5.3 Mixtures of several tile products are commonly installed on a surface, requiring a means to calculate LRV for a product mix. The rating obtained for an individual tile product can be used to calculate the LRV for a product mix using the following equation:where:n=number of products included in the mixp1 to n=the proportion of the surface area taken up by each product, the sum of p1to pnmust equal oneLRV1to n=the LRV for each product usedFor example, a mixture of two products is used on a surface. Two thirds of the surface area is covered by product A with a LRV of 75 %, and one third of the surface is covered by product B with an LRV of 60 % (see Fig. 2). Using the equation, the product mix is found to have an LRV of 70 %.5.4 The test method described herein provides instrumental means as the basis for judging color difference. Magnitude of color difference between pairs of ceramic tile can be determined and expressed in numerical terms.5.5 Based on interlaboratory investigation,3color difference ΔEof plain-colored tile, if determined according to this test method, should give excellent reproducibility with a standard deviation of not more than σ = ±0.15 units. LRV should also give excellent reproducibility when used for solid colored tile based on the relationship between LRV and either the Y tristimulus or L value. However, LRV reproducibility for multicolored, speckled, or textured surface tile will be dependent upon the degree of variation of the tile specimen, and will require a different measurement procedure to minimize the impact of the variation.5.6 The test method requires the use of multiple illuminants for the determination of color difference between solid-colored tiles. Evaluation under incandescent, fluorescent and daylight illuminant conditions ensure the color differences calculated between a test and reference specimen account for the possible occurrence of metamerism. 1.1本试验方法包括使用符合试验方法规定要求的任何分光光度计测量有釉或无釉瓷砖之间的光反射值（LRV）和视觉小色差。LRV和色差的大小和方向用数字表示，具有足够的精度，可用于产品规范。1.2可以测量纯色瓷砖或具有多色、斑点或纹理表面的瓷砖的LRV。对于非纯色瓷砖，应从代表整体样品的图案中进行的多次测量中获得平均读数，如所述9.2本试验方法。瓷砖之间的小色差只能测量纯色瓷砖。具有多色、斑点或纹理表面的瓷砖之间的微小色差无效。1.3对于纯色瓷砖，应在白炽灯、荧光灯和日光照明条件下对试样和参考试样进行比较。当被比较的瓷砖是异聚物时，使用多个光源可以进行色差测量，而不存在错误接受匹配的风险。（参见3.1.4.)1.4以英寸-磅为单位的数值应视为标准值。括号中给出的值仅供参考。1.5本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。====意义和用途======5.1本试验方法描述了测定瓷砖试样LRV的方法。某些建筑规范要求使用LRV评定的材料。本试验方法的应用为瓷砖的评级提供了手段。瓷砖的LRV报告应包括参考观察员和有效额定值的光源。5.2 LRV是一种取决于瓷砖样本整体颜色的特性。LRV的控制是通过控制颜色来实现的，遵守颜色规范将决定产品对LRV的可接受性。因此，除非产品的颜色不可接受，否则不能判断产品具有不可接受的LRV。5.3几种瓷砖产品的混合物通常安装在表面上，需要一种方法来计算产品混合物的LRV。单个瓷砖产品的额定值可用于使用以下等式计算产品组合的LRV:哪里:n=产品组合中包含的产品数量p1到n=每种产品所占表面积的比例，p的总和1.至pn必须等于1轻轨车辆1.至n=使用的每种产品的LRV例如，在表面上使用两种产品的混合物。三分之二的表面积被LRV为75的产品A覆盖 %, 三分之一的表面被LRV为60的产品B覆盖 % （见图。2). 使用该方程，发现产品组合的LRV为70 %.5.4本文所述的试验方法提供了仪器方法，作为判断色差的基础。瓷砖对之间色差的大小可以用数字表示。5.5基于实验室间调查，3.色差ΔE如果根据本试验方法测定，则应具有良好的再现性，标准偏差不超过σ = ±0.15个单位。基于LRV与Y三色刺激或L值之间的关系，LRV用于实心彩色瓷砖时也应具有良好的再现性。然而，多色、斑点或纹理表面瓷砖的LRV再现性将取决于瓷砖样本的变化程度，并需要不同的测量程序以将变化的影响降至最低。5.6本试验方法要求使用多种光源来测定固体之间的色差-彩色瓷砖。在白炽灯、荧光灯和日光照明条件下进行评估，确保测试样本和参考样本之间计算的色差能够解释可能出现的同色异谱现象。展开▼

关联标准

代替如下标准

1.ASTM C609-07 Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile。

被如下标准代替

1. ASTM C609-07(2019) Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile。

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