1.1 本试验方法涵盖高温下热塑性路面标线材料的A型硬度计硬度。 1.2 该测试方法与测试方法类似 第240页 特别注意保持试样和仪器的温度恒定。在公路材料界，它有时被称为“压痕阻力” 1.3 用于测定温度、硬度和时间的所有材料、仪器或设备应可追溯至国家标准技术研究所或其他国际公认的平行组织。 1.4 以国际单位制表示的值应视为标准值。括号中给出的值仅供参考。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 该方法基于特定类型压头在特定条件下压入材料时的穿透力。压痕硬度与贯入度成反比，并取决于材料的弹性模量、粘弹性行为、压痕器的几何形状、施加的力和试验温度。这种测试方法是经验的，因此主要用于控制目的。本试验方法测定的压痕硬度与被测材料的任何基本特性之间不存在简单的关系。

1.1 This test method covers Type A Durometer hardness of thermoplastic pavement marking material at elevated temperatures. 1.2 This test method is similar to Test Method D2240 for hardness with special attention given to keeping the temperature of the test sample and instrument constant. Within the highway materials community, it is sometimes known as “indentation resistance.” 1.3 All materials, instruments or equipment used for the determination of temperature, hardness and time shall be traceable to National Institute of Standards and Technology or other internationally recognized organizations parallel in nature. 1.4 The values stated in SI units are to be regarded as 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 ====== 5.1 This method is based on the penetration of a specific type of indentor when forced into the material under specified conditions. The indentation hardness is inversely related to the penetration and is dependent on the elastic modulus, viscoelastic behavior of the material, geometry of the indentor, the applied force and temperature at test. This test method is empirical and therefore primarily for control purposes. No simple relationship exists between indentation hardness determined by this test method and any fundamental property of the material tested.