1.1 本试验方法涵盖了根据已知硬度的拉丝或铅笔芯快速、廉价地测定金属或类似硬质基材上有机涂层膜硬度的程序。 1.2 该试验方法在内容上与ISO 15184相似（但在技术上不等同）。 注1: 其他程序可用于测量有机涂层在单点（触针尖端）作用下的永久变形，包括但不限于测试方法 D2197 , D5178 和 G171页 . 1.3 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。 1.4 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。 1.5 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====== 5.1 涂料行业多年来一直使用铅笔硬度测量来确定透明和着色有机涂层的硬度。 该试验方法也用于确定这些涂层的固化，尤其是在使用强制干燥热时。 5.2 该测试方法便于在单个实验室进行开发工作和生产控制测试。应该认识到，当使用不同制造商的铅笔以及不同的基质时，在不同的实验室中获得的结果可能不同。为了提高特定试验组的试验结果再现性，建议使用同一制造商从同一批次生产的拉丝或铅笔。如果在后续评估时无法获得来自同一制造商和同一批次的绘图导线或铅笔，则应在测试报告中注明。 注3: 使用不同制造商或来自同一制造商但不同生产批次的铅或铅笔，可能会导致相同铅笔硬度范围内铅的显著变化。 5.3 已发现该测试方法有助于为一系列在膜硬度上表现出显著差异的涂层提供相对排名。当试图比较类似膜硬度的涂层时，应小心。 5.4 本试验方法可能不适用于应用于木材或其他较软基材的涂层，其结果可能更多地取决于基材变形而非涂层硬度。 5.5 如果将本试验方法用作采购协议的基础，则如果相关方之间就给定的一组裁判铅笔达成一致，则将达到最大精度。

1.1 This test method covers a procedure for rapid, inexpensive determination of the film hardness of an organic coating on a metal or similarly hard substrate in terms of drawing leads or pencil leads of known hardness. 1.2 This test method is similar in content (but not technically equivalent) to ISO 15184. Note 1: Other procedures are available to measure permanent deformation of organic coatings under the action of a single point (stylus tip) including but not limited to Test Methods D2197 , D5178 , and G171 . 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 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. 1.5 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 ====== 5.1 Pencil hardness measurements have been used by the coatings industry for many years to determine the hardness of clear and pigmented organic coating films. This test method has also been used to determine the cure of these coatings, especially when using forced dried heat. 5.2 This test method is convenient in developmental work and in production control testing in a single laboratory. It should be recognized that the results obtained may vary between different laboratories when different manufacturer’s pencils as well as when different substrates are used. To improve test result reproducibility for a specific group of tests, it is recommended to utilize drawing leads or pencils made by the same manufacturer and from the same batch. If drawing leads or pencils from the same manufacturer and from the same batch are not available at the time of subsequent evaluations, it shall be noted on the test report. Note 3: Using leads or pencils made by different manufacturers or from the same manufacturer but different production batches, may result in significant variation for leads within the same pencil hardness scale. 5.3 This test method has been found to be useful in providing relative rankings for a series of coatings that exhibit significant differences in film hardness. Caution should be used when attempting to compare coatings of similar film hardness. 5.4 This test method may not be appropriate for coatings applied to a wood or other softer substrate in which results may be more a function of substrate deformation than coating hardness. 5.5 If this test method is used as a basis for purchase agreement, maximum precision will be achieved if a given set of referee pencils be agreed upon between the interested parties.