本文件规定了水与纸和纸板表面之间接触角的光学评估方法，其中液滴形成过程、在平面基板上的应用或与固体接触的液滴形状的测量由自动化设备执行。 测量极限由所用仪器的性能决定。本文件定义的仪器功能使用数字图像捕获系统，该系统以每秒至少50帧的速度运行，并且需要能够在液滴与基板之间不超过20 ms至40 ms的接触后执行第一次测量。 本试验方法适用于大多数纸张或纸板，但不适用于结构材料。

This document specifies the method for optical assessment of the contact angle between water and the surface of paper and board, where the process of droplet formation, application to planar substrates, or measurement of the droplet shape in contact with the solid is performed by automated equipment. The limits of measurement are determined by the capabilities of the instrumentation used. The instrumental capabilities defined by this document use a digital image capturing system operating at a minimum of 50 frames per second and needs the ability to perform the first measurement after no more than 20 ms to 40 ms contact between the droplet and substrate. The test method is applicable to most kinds of paper or board however it cannot be applicable to structured materials.