1.1 本规程描述了在测量有机涂层（如油漆、清漆和油漆）的湿膜厚度时，使用薄刚性金属缺口规（也称为阶梯规或梳状规）。 1.2 缺口量规测量既不准确也不敏感，但在尺寸和形状禁止使用试验方法中给出的更精确方法的情况下，它们可用于确定物品涂层的近似湿膜厚度 D1212 . 1.3 该实践分为以下两个步骤: 1.3.1 程序A- 带有缺口的方形或矩形刚性金属量规用于测量3至2000μm（0.5至80密耳1）的湿膜厚度。这种量规适用于平面基材上的涂层以及各种尺寸和复杂形状物品上的涂层，其中量规的端部凸舌可能位于基材上的同一平面上。 1.3.2 程序B- 圆形薄刚性金属缺口规用于测量25至2500μm（1至100密耳）的湿膜厚度。 这种量规适用于平面基材上的涂层以及各种尺寸和复杂形状物体上的涂层。 1.4 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 尽管在某些规范中规定了湿膜厚度，但对物品上涂层的湿膜厚度测量对于控制最终干涂层的厚度非常有帮助。 大多数防护和高性能涂层的应用都是为了满足每层涂层或完整涂层系统或两者的干膜厚度要求或规范。 4.2 干膜厚度和湿膜厚度之间存在直接关系。湿膜/干膜比由涂覆时涂层中挥发物的体积决定，包括允许的稀释。对于一些平涂层，干膜厚度高于根据湿膜厚度计算的厚度。因此，缺口规的结果不用于验证涂层的非挥发性含量。 4.3 施涂时测量湿膜厚度最合适，因为它允许施涂器在施涂时对膜进行校正和调整。在薄膜干燥或化学固化后对其进行校正需要花费大量额外的劳动时间，可能会导致薄膜污染，并可能导致涂层系统的附着力和完整性问题。 4.4 使用缺口量规的程序不能提供与试验方法中所述的化学间和Pfund量规一样准确或灵敏的湿膜厚度测量 D1212 . 然而，凹口量规可用于不均匀表面，如混凝土块，其过于粗糙，无法使用化学和Pfund量规。此外，在尺寸和形状不适合其他类型量规测量的情况下，切口量规在车间和现场可用于确定商业物品上湿膜的近似厚度。例如椭圆、薄边和角。 4.5 有使用缺口量规经验的操作员可以很好地监控涂层应用，以确保获得所需的最小膜厚。 4.6 涂覆损失，如过度喷涂、转移损失和涂覆设备中的涂层残留物，是作业中使用的涂层中不可测量的重要部分，不通过测量湿膜厚度来解释。

1.1 This practice describes the use of thin rigid metal notched gages, also called step or comb gages, in the measurement of wet film thickness of organic coatings, such as paint, varnish, and lacquer. 1.2 Notched gage measurements are neither accurate nor sensitive, but they are useful in determining approximate wet film thickness of coatings on articles where size(s) and shape(s) prohibit the use of the more precise methods given in Test Methods D1212 . 1.3 This practice is divided into the following two procedures: 1.3.1 Procedure A— A square or rectangular rigid metal gage with notched sides is used to measure wet film thicknesses ranging from 3 to 2000 μm (0.5 to 80 mils 1). Such a gage is applicable to coatings on flat substrates and to coatings on articles of various sizes and complex shapes where it is possible to get the end tabs of the gage to rest in the same plane on the substrate. 1.3.2 Procedure B— A circular thin rigid metal notched gage is used to measure wet film thicknesses ranging from 25 to 2500 μm (1 to 100 mils ). Such a gage is applicable to coatings on flat substrates and to coatings on objects of various sizes and complex shapes. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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. 1.6 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 ====== 4.1 Wet film thickness measurements of coatings applied on articles can be very helpful in controlling the thickness of the final dry coating, although in some specifications the wet film thickness is specified. Most protective and high performance coatings are applied to meet a requirement or specification for dry film thickness for each coat or for the completed coating system, or for both. 4.2 There is a direct relationship between dry film thickness and wet film thickness. The wet film/dry film ratio is determined by the volume of volatiles in the coating as applied, including permitted thinning. With some flat coatings the dry film thickness is higher than that calculated from the wet film thickness. Consequently, the results from the notch gage are not to be used to verify the nonvolatile content of a coating. 4.3 Measurement of wet film thickness at the time of application is most appropriate as it permits correction and adjustment of the film by the applicator at the time of application. Correction of the film after it has dried or chemically cured requires costly extra labor time, may lead to contamination of the film, and may introduce problems of adhesion and integrity of the coating system. 4.4 The procedures using notched gages do not provide as accurate or sensitive measurements of wet film thickness as do the Interchemical and Pfund gages described in Test Methods D1212 . Notch gages may, however, be used on nonuniform surfaces, like concrete block, that are too rough to use the Interchemical and Pfund gages. Also notched gages can be very useful in the shop and field for determining the approximate thickness of wet films over commercial articles where size(s) and shape(s) are not suitable for measurements by other types of gages. Examples of such items are ellipses, thin edges, and corners. 4.5 An operator experienced in the use of a notched gage can monitor the coating application well enough to ensure the minimum required film thickness will be obtained. 4.6 Application losses, such as overspray, loss on transfer, and coating residue in application equipment, are a significant unmeasurable part of the coating used on a job and are not accounted for by measurement of wet film thickness.