非常抱歉，我们暂时无法提供预览，您可以试试： 免费下载 ASTM C609-2007(2014) 前三页，或者稍后再访问。
5.1x00a0;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.
5.2x00a0;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.
5.3x00a0;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:
|n||x00a0;x00a0;=x00a0;x00a0;||number of products included in the mix|
|p1 to n||x00a0;x00a0;=x00a0;x00a0;||the proportion of the surface area taken up by each product, the sum of p1 to pn must equal one|
|LRV1 to n||x00a0;x00a0;=x00a0;x00a0;||the LRV for each product used|
5.4x00a0;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.
5.5x00a0;Based on interlaboratory investigation,3 color difference x0394;E of plain-colored tile, if determined according to this test method, should give excellent reproducibility with a standard deviation of not more than x03c3;8201;=8201;x00b1;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.
5.6x00a0;The test method requires the use of multiple illuminants for the determinati......
Copyright ©2007-2016 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证：京ICP证110310号