1.1 本规程涵盖了使用实践周期1加速工厂涂层压花硬纸板风化效果的技术 G90 （集中自然阳光，定期喷洒地表水）加上浸泡-冻融循环（见第节） 5. 这种做法）。 1.2 使用本规程中描述的方法进行的测试可用于风化影响的定性评估。涂层硬纸板的相对耐久性可通过将其试验结果与实时暴露试验经验得出的对照试样的试验结果进行比较来确定。 1.3 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。 1.4 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 快速准确地评估和预测工厂涂装涂料的长期耐候性能的能力对于做出合理的商业和技术决策至关重要。 5.2 重要的是包括已知现场性能的对照样品，以确定本规程对特定基材和涂层系统的功效。这些对照样品可能包括已知对所考虑的缺陷具有可接受和不可接受现场性能的材料。 5.3 从该实践中得出的结果最好用于比较在同一设备中同时测试的材料的相对性能。 5.4 纳入对照样本及其结果数据将有助于处理由重要气候因素的季节或年度变化引起的试验变异性。 5.5 在制定本标准实践的过程中进行了广泛的研究。这项研究表明，这种做法不适用于确定定量加速因子。 然而，这种做法对于比较不同材料的性能非常有用。 5.6 建议对对照样品和试样至少进行两次重复，以便对结果进行统计评估。参考实践 G169页 有关确定复制数量的更多指导。

1.1 This practice covers techniques to accelerate weathering effects of factory-coated embossed hardboard using Cycle 1 of Practice G90 (concentrated natural sunlight with periodic surface water spray) plus a soak-freeze thaw cycle (see Section 5 of this practice). 1.2 Testing by use of the methods described in this practice may be employed in the qualitative assessment of weathering effects. The relative durability of coated hardboards may be best determined by comparison of their test results with those of control specimens derived from real time exposure test experience. 1.3 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. 1.4 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 The ability to quickly and accurately evaluate and predict long-term weathering performance of factory-applied coatings is of paramount importance in making sound business and technical decisions. 5.2 It is important to include control specimens of known field performance to determine the efficacy of this practice for specific substrate(s) and coating system(s). These control specimens may include materials known to possess acceptable and unacceptable field performance for the defect(s) under consideration. 5.3 Results derived from this practice are best used to compare the relative performance of materials tested at the same time in the same device. 5.4 The inclusion of control specimens and their resulting data will assist in dealing with test variability caused by seasonal or annual variations in important climatic factors. 5.5 Extensive research was performed during the development of this standard practice. This research showed that this practice is not useful for determination of quantitative acceleration factors. However, this practice is very useful for comparing the performance of different materials. 5.6 A minimum of two replicates for both control specimens and test specimens is recommended to allow statistical evaluation of results. Refer to Practice G169 for additional guidance on establishing the number of replicates.