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现行 ASTM D2805-11(2023)
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Standard Test Method for Hiding Power of Paints by Reflectometry 用反射法测定涂料遮盖力的标准试验方法
发布日期: 2023-07-01
1.1 本试验方法包括在不参考材料涂料标准的情况下,测定具有 Y三刺激值大于15 %. 经过适当的修改,它也可以用于测试烘焙饰面。 1.2 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.3 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制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 这是一种精确的仪器方法,在不参考对比涂料的情况下给出具有绝对物理意义的结果。当要求最大精度和最小主观性时,应使用它,如在测试涂料规范或评估颜料的隐藏效率时。 5.2 隐藏能力测试方法 D344 是视觉的而不是工具的,并且给出的结果是相对于材料标准而不是绝对的。它不如测试方法精确 D2805 但更符合实际的涂装程序。
1.1 This test method covers the determination, without reference to a material paint standard, of the hiding power of air dry coatings with Y tristimulus values greater than 15 %. With appropriate modification, it can also be used to test baking finishes. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 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. ====== Significance And Use ====== 5.1 This is a precise instrumental method giving results having an absolute physical significance without reference to a comparison paint. It should be used when maximum precision and minimum subjectivity are required, as in testing specification coatings or evaluating the hiding efficiency of pigments. 5.2 Hiding power Test Method D344 is visual instead of instrumental, and gives results that are relative to a material standard instead of absolute. It is less precise than Test Method D2805 but more closely aligned with practical painting procedures.
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归口单位: D01.26
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