1.1 本规程提供了选择木材或木材复合基材的指南，用于评估建筑涂料（如外部涂料、底漆和甲板饰面）的特定耐候性能特征。 1.2 程序包括选择木材种类和通过目视检查木材特性选择单个木材试板。 1.3 本规程旨在涵盖建筑涂料风化研究中最常用的木材基材。本指南并非旨在为评估建筑涂料的耐候性能特征而使用的所有木材品种提供全面的指南。 1.4 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物； 因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.5 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。 1.6 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《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 自然风化试验可能需要几年时间，加速风化评估通常需要几周或几个月的周期才能获得有用的数据。 将木板选择与所需的耐候性能特征相关联，有助于涂料实验者在所需的时间范围内最大化信息。 5.2 由于暴露测试需要很长的时间跨度，在控制尽可能多的变量的同时，规划可靠的实验至关重要。因此，从具有代表性的木材品种或复合材料、木材等级和预期涂漆的表面类型中选择实验板非常重要。 5.3 本规程可用于任何类型的外部建筑涂料，用于木材或木材复合基材，如外部房屋涂料、底漆、木材污渍或防水剂。

1.1 This practice offers guidelines for selecting wood or wood composite substrates for the evaluation of specific weathering performance characteristics of architectural coatings such as exterior paints, primers, and deck finishes. 1.2 Procedures include selecting wood species and choosing individual wood test panels through visual examination of the wood characteristics. 1.3 This practice is intended to cover the most commonly employed wood substrates used in weathering studies of architectural coatings. It is not intended to serve as a comprehensive guide for all wood species that may be employed for the purpose of evaluating weathering performance characteristics of architectural coatings. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 Natural weathering tests can take several years and accelerated weathering evaluations often run for cycles requiring several weeks or months before obtaining useful data. Correlating wood panels selection with desired weathering performance characteristics assists a coatings experimenter in maximizing information in the desired time frame. 5.2 Because of the long time spans required for exposure testing, it is critical to plan a reliable experiment while controlling as many variables as possible. For this reason, selection of experimental panels made from representative wood species or composites, grades of lumber and surface types that are expected to be painted is very important. 5.3 This practice may be used for any types of exterior architectural coating intended for use on wood or wood composite substrate such as exterior house paints, primers, wood stains, or waterproofers.