意义和目的
5.1 许多涂层性能受到干膜厚度的显着影响, 比如附着力, 灵活性, 穿, 耐用性, chemical resistance, and hardness. In order to be able to compare the results obtained by different operators, the film thickness needs to be carefully measured.

5.2 Most protective and high performance coatings are designed to meet the requirements or specifications for the dry film thickness of each coating or the whole system or both. Coatings need to be applied within certain minimum and maximum thickness tolerances so that they can perform their intended function. In addition to potential performance defects, it is uneconomical to use more material than necessary when coating large areas such as floors and walls.

5.3 Occasionally low readings may occur on coatings with rough surfaces. The instrument can allow the user to adjust to prevent this.

5.4 This test method may not be suitable for measuring the thickness of organic coatings on all substrates. The ability of the instrument to detect different interfaces between the coating and the substrate may be hampered if the composition, 密度, or attenuation of the coating and the substrate are similar, or if the coating is not uniform. If these conditions are considered, verify the operation on a coating/substrate combination of known thickness.

5.5 The multilayer coating has many interfaces, and the instrument will measure the interface separating the two materials with the greatest acoustic difference. Some instruments are able to detect and measure the thickness of individual layers in multi-layer systems.

5.6 The use of this test method is not necessarily limited by the type of substrate material.

美国材料试验协会D 6132-2020 “采用无损方法测量混凝土有机涂料的干膜厚度 (IE. 使用超声波设备)”

范围
1.1 The test method describes the accurate and nondestructive measurement of dry film thickness of organic coatings applied to substrates of different materials using ultrasonic film thickness gauges. Measurements can be made on field structures, commercially manufactured products, or laboratory test samples. These types of gauges can accurately measure the dry film thickness of organic coatings on various substrates such as concrete, 木头, wall panels, 塑料, fiber composites, and metals.

1.2 The test method is not applicable to coatings that are prone to deform under the load of the measuring instrument because the instrument probe is placed directly on the surface of the coating for reading.

1.3 The effective range of instruments using ultrasonic principles is limited by the design of measuring tools. Thickness ranges from 8 微米至 7.60 毫米 (0.3 到 300 密耳).

1.4 以 SI 单位表示的值应被视为标准值. 其他计量单位不包括在本标准中.

1.5 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.

1.6 本国际标准是根据《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制定的, 世界贸易组织贸易技术壁垒委员会发布的指南和建议.