1.1 本试验方法用于测定固化步骤中三聚氰胺-甲醛基涂料产生的甲醛。该结果可用于确定在受控实验室条件下从样品中释放出的“固化甲醛”。 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 该测试方法能够在规定的测试条件下（3000 ml/min总流量，50 ml/min DNPH管流量）测量500μg/g至22000μg甲醛/g干涂层。可以调节总流量与DNPH管流量的比率，以扩大该方法的范围。 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）。 本标准的使用者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====== 5.1 该测试方法测量在高温下固化过程中，含有三聚氰胺甲醛树脂的涂层释放出的甲醛量。从侧面解决甲醛问题- 官能化聚合物与三聚氰胺甲醛树脂交联过程中的反应。当涂层温度高到足以引发交联时，固化甲醛在最终烘焙或固化炉中产生。甲醛可以在涂层的涂敷、溶剂闪蒸和固化过程中释放出来。游离甲醛主要在涂层应用和溶剂闪蒸过程中产生。试验方法 D1979 氨基树脂中游离甲醛的测定和试验方法 D6191 测量环境温度下涂料中的甲醛含量。这种方法只测量热固化过程中释放的甲醛，这主要是“固化甲醛” 5.2 该测试方法不是为了复制工业过程中产生的甲醛，而是作为一种可重复的比较实验室评估。 5.3 该测试方法尚未用在40或以下固化的催化涂层系统进行评估 °C，例如木材加工行业使用的温度，可能需要对此应用进行特殊调整。

1.1 This test method is for the determination of formaldehyde evolved from melamine-formaldehyde-based coatings during the cure step. The results may be used to determine the “cure formaldehyde” evolved from a sample under controlled laboratory conditions. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This test method is capable of measuring from 500 μg/g to 22 000 μg formaldehyde/g dry coating under the test conditions specified (3 000 ml/min total flow, 50 ml/min DNPH tube flow). The ratio of total flow to DNPH tube flow could be adjusted to extend the range of the method. 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 This test method measures the amount of formaldehyde that is evolved from a coating containing melamine-formaldehyde resin(s) during cure at elevated temperature. Cure formaldehyde results from a side-reaction during cross-linking of functionalized polymers with melamine-formaldehyde resins. Cure formaldehyde is evolved in the final bake or cure oven, when the coating temperature is high enough to initiate cross-linking. Formaldehyde can be released from a coating during application, solvent flash-off and cure. Free formaldehyde is primarily evolved during coating application and solvent flash-off. Test Method D1979 measures “free formaldehyde” in amino resins and Test Method D6191 measures formaldehyde evolved from coatings at ambient temperature. This method measures only the formaldehyde released during heat cure, which is primarily “cure formaldehyde.” 5.2 This test method is not intended to duplicate the evolved formaldehyde from an industrial process, but serves as a reproducible comparative laboratory evaluation. 5.3 This test method has not been evaluated with catalyzed coating systems that cure at or below 40 °C, such as those used by the wood-finishing industry, and would likely require special adaptation for this application.