1.1 本规程为确定漆膜在外部暴露时对微生物攻击的敏感性提供了指导。虽然人们认识到，暴露的涂层上可能会出现各种生物体，但具体类型的生物体主要是学术界感兴趣的。微生物变色的程度是主要关注点。 1.2 本规程涵盖了测试涂料的制备、在基材上的应用，以及将涂层面板布置在外部测试架上，以确定一段时间内涂层表面可能发生的微生物侵蚀程度。 1.3 本规程旨在为选择耐藻类和真菌变色或变形的外部涂层的各种关键因素提供指导和讨论。 1.4 以国际单位制表示的值应被视为标准。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（如果有的话）。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》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 3.1 真菌和藻类在漆膜内外的生长是导致漆面变色或变形的主要原因。 3.2 对暴露在外的涂层物体进行简单观察被认为是确定微生物使涂层变色程度的实用可靠方法。然而，这适用于在给定条件下暴露的特定涂层物体。 3.3 应该认识到，当暴露在其他条件下时，有一些关键因素会影响同一涂层物体上可能发生的微生物生长量。这些因素包括地理位置、当地大气条件，如空气中的灰尘和花粉含量、暴露角度、涂层受风化的程度、水分和阳光的影响、涂层施加的基材以及受测油漆系统中的涂层。 后一个因素包括包装在容器中时涂层的稳定性，以及整个系统中包含的涂层成分和每种涂层的厚度。因此，虽然微生物出现在最后一层薄膜的表面，但微生物生长的程度也受到底漆成分的影响。在选择耐微生物变色的涂层时，应考虑上述所有因素。

1.1 This practice provides guidelines for determining the susceptibility of paint films to microbiological attack on exterior exposure. While it is recognized that various organisms may occur on an exposed coating, the specific types of organisms are mainly of academic interest. The degree to which microbiological discoloration occurs is the primary concern. 1.2 This practice covers the preparation of coatings for testing, their application on substrates, and the arrangement of the coated panels on exterior test racks to determine the degree of microbiological attack that may occur on the surface of the coatings over a period of time. 1.3 This practice is intended to provide guidelines for, and a discussion of, the various factors critical in selection of exterior coatings resistant to discoloration or disfigurement by algae and fungi. 1.4 The values stated in SI units are to be regarded as the 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 ====== 3.1 The growth of fungi and algae in and on the surface of paint films represents a major cause of discoloration or disfigurement of painted surfaces. 3.2 Simple observation of a coated object subjected to exterior exposure is considered a practical and reliable method for determining the degree that microorganisms discolor the coating. However, this applies to a specific coated object exposed under a given set of conditions. 3.3 It should be recognized that there are critical factors that influence the amount of microbial growth that may occur on the same coated object when exposed to other conditions. These factors include the geographic location, local atmospheric conditions such as the dust and pollen content of the air, angle of exposure, degree to which the coating is subjected to weathering, effects of moisture and sunlight, the substrates on which the coating is applied, and the coatings in the paint system under test. The latter factor includes the stability of the coating while packaged in the container, as well as the composition of the coatings included in the total system and the thickness of each coating applied. Thus, while microorganisms occur on the surface of the last film applied, the degree of microbiological growth that will occur is also influenced by the composition of the undercoats. All the above factors should be considered in the selection of a coating resistant to discoloration by microorganisms.