ISO 19399:2016规定了一种测定干膜厚度的破坏性方法，在该方法中，以确定的方式对涂层造成的损坏进行显微镜评估。该方法适用于几乎所有涂层-基底组合，还允许测定涂层系统的单膜厚度。 无法应用该方法，或者仅在出现以下情况时才可以应用该方法: -太软和/或弹性涂层（无法观察到可识别的划线或钻孔）， -坚硬（不能划线/钻孔）或太软和/或弹性基底， -涂层和基材之间的视觉对比度太低，以及 -薄膜厚度大于测量显微镜的景深。

ISO 19399:2016 specifies a destructive method for determination of the dry film thickness, in which damage to the coat caused in a definite manner is evaluated microscopically. The method is suitable for almost all coat-substrate combinations and also allows determination of the single film thicknesses of coating systems. The method cannot be applied or can only be applied with restrictions in case of - too soft and/or elastic coatings (no recognizable scribe or drill hole can be observed), - hard (cannot be scribed/drilled) or too soft and/or elastic substrates, - too low visual contrast between the coating and substrate, and - film thicknesses that are larger than the depth of field of the measuring microscope.