1.1 本试验方法涵盖了评估高光泽涂层相对耐擦伤性的程序。包括两种测试方法。试验方法A使用一个装置，该装置在垂直轴上旋转试样，以抵抗两个研磨轮的滑动旋转。试验方法B使用一种装置，该装置在装有砂纸的固定轮上的水平面上往复移动试样，并在每次双冲程后推进。这两种方法均可用于评估应用于平面刚性表面的涂层的干摩擦耐擦伤性。 每种测试方法都能很好地区分高耐擦伤涂层。 注1: 通过这些试验方法获得的耐擦伤性值没有绝对意义。它们只能用于推导从当前正在评估的一系列涂层中制备的试板的相对性能排名。如果实验室之间引用了耐擦伤性值，则必须测量一个通用标准，并将这些值与该标准进行比较。即使如此，也应谨慎使用这些值。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 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。 1.4 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，尤其是用于汽车、船只、玩具等的高光泽涂料，受到各种条件的影响（例如，擦拭、清洁和暴露），可能会损坏其表面。这些涂层保持外观的能力是产品的一个重要属性。这些测试方法提供了一种评估高光泽涂层抗损伤能力的方法。 5.2 这些测试方法不提供基本值。然而，它们适用于评估高光泽涂层抵抗mar的能力。 5.3 由于涂层对损伤的敏感性差异很大，导致“相关”损伤所需的循环次数也不同。通常，2到50个循环就足够了。

1.1 This test method covers procedures for evaluating the relative mar resistance of high gloss coatings. Two test methods are included. Test Method A uses a device that rotates the test specimen on a vertical axis, against the sliding rotation of two abrading wheels. Test Method B uses a device that reciprocates a specimen in a horizontal plane over a stationary wheel that has been fitted with abrasive paper and is advanced after each double stroke. Either method can be used to evaluate the dry abrasion mar resistance of coatings applied to planar, rigid surfaces. Each test method provides good discrimination between highly mar resistant coatings. Note 1: The mar resistance values obtained by these test methods have no absolute significance. They should only be used to derive relative performance rankings for test panels that have been prepared from the series of coatings that are currently being evaluated. If mar resistance values are quoted between laboratories, it is essential that a common standard be measured and that the values be compared to that standard. Even then, the values should be used with caution. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 Coatings, particularly the high gloss coatings used on automobiles, boats, toys, etc., are subject to a wide variety of conditions (for example, wiping, cleaning, and exposure) that can mar their surface. The ability of these coatings to maintain their appearance is an important product attribute. These test methods provide a way to estimate the ability of high gloss coatings to resist mar damage. 5.2 These test methods do not provide fundamental values. However they are suitable for estimating the ability of high gloss coatings to resist mar. 5.3 Since the susceptibility of coatings to marring varies widely, the number of cycles that are needed to cause “relevant” mar damage also varies. Usually, 2 to 50 cycles are sufficient.