瓷砖块间光反射值和少量色差的测量用标准试验方法

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- 标准号
- ASTM C609-2007(2014)
- 发布日期
- 2007
- 实施日期
- 废止日期
- 无
- 中国标准分类号
- Q31;Q33
- 国际标准分类号
- 91.100.25 (Terracotta building products)
- 发布单位
- US-ASTM

- 适用范围
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:

where:

*n*x00a0;x00a0;=x00a0;x00a0; number of products included in the mix *p*_{1 to n}x00a0;x00a0;=x00a0;x00a0; the proportion of the surface area taken up by each product, the sum of p _{1}to p_{n}must equal one*LRV*_{1}to nx00a0;x00a0;=x00a0;x00a0; the LRV for each product used

**FIG. 2 Example of a Product Mix Used on a Surface**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......

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