意义及用途
5.1 The test method determines the coverage of the test coating by visually evaluating the sprayed coating.
笔记 1 Test method D2805 describes an instrumental method for determining coverage. Apply the film to a uniform thickness (例如. with a scraper), measure the film thickness strictly, and determine the opacity by photometry. Thus the concealment force can be determined with high precision.
5.2 Test method D6762 is not as accurate as test method D2805, but it is widely used because it is closely related to the application characteristics of paints and is simpler in terms of concept and evaluation.
ASTM D6762-2018 “Determination of Covering Power of Coatings by Self-Evaluation of Spraying Construction Coatings”
步 1: 范围
1.1 This test method enables quantitative visual determination of the film thickness required for complete coverage. The film thickness is considered to test the coating’s hiding power.
1.2 The method is applicable only to sprayed coatings, but the concept can also be applied to other applications.
1.3 Values expressed in inches to pounds shall be treated as standard values. The values given in brackets are mathematical conversions of SI units for reference only and are not considered as standards.
1.4 This standard is not intended to address all safety issues associated with its use. 本标准的使用者有责任建立适当的安全机制, 健康和环境实践，并在使用前确定监管限制的适用性.
1.5 本国际标准基于《关于制定国际标准的原则的决定》中确立的国际公认的标准化原则, Guidelines and Recommendations issued by the WTO Committee on Technical Barriers to Trade (贸易壁垒).
ASTM D6762-2018 “Determination of Covering Power of Coatings by Self-Evaluation of Spraying Construction Coatings”
2. 参考文件
ASTM标准
D16 Paints, terms related to coatings, materials and applications
Practice of preparing cold rolled steel plates for testing paints, 清漆, conversion films and related coating products
D1005 Test method for dry film Thickness of organic coatings using a micrometer
D1729 Visual evaluation of diffuse reflection of opaque materials for color and chromatic aberration practice
Method for preparing D1730 coated aluminum and aluminum alloy surfaces
D2805 Test method for Covering power of coatings by reflection
D7091 Nondestructive measurement of dry film thickness for non-magnetic coatings for ferrous metals and for non-magnetic, non-conductive coatings for ferrous metals
E691 Practice of conducting interlaboratory studies to determine the accuracy of test methods