意义及用途
3.1 当涂料应用于墙壁等大表面时, the film thickness may vary when the color of the fresh material is very similar to the previous film, or small areas may be completely missed (holidays). If these areas could be retouched without having to repaint the entire surface, the cost would be much lower.

3.2 Where the area that was coated a short time ago is connected to the area that is currently coated (number of turns), the thickness is also affected. An application technique that may affect the final appearance of the film is brushing or rolling the material in different directions in adjacent areas.

3.3 Both buyers and sellers are interested in determining whether the coating can be applied without areas showing differences in appearance due to lap and brush or roller markings, and whether it can be easily modified to provide a uniform appearance in gloss or shine and all other aspects.

ASTM D3928-2018 评估光泽或光泽均匀性的标准测试方法

半径
1.1 The test method includes determining the gloss or uniformity of the gloss of the paint applied by brush to a test panel that simulates an interior wall portion. Visually assess changes in shine or gloss that may be caused by short wet edge time, poor leveling, and pigment orientation or flotation during and after application.

1.2 As both application and group assessment are very subjective, this test method should only be used for comparative testing in one laboratory, as ratings assigned by different laboratories are often inconsistent (看 8.1).

1.3 Values given in SI units shall be considered standard. 括号内的数值仅供参考.

1.4 本标准并非旨在解决所有安全问题, 如果有的话, 与其使用相关. 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, 世贸组织贸易技术壁垒委员会发布的指南和建议.