1.1 本试验方法包括测定用作木材粘合剂的脲醛树脂溶液的表观不挥发物含量。由于此类树脂的化学性质，所测定的不挥发物含量因所用试验类型而异。为了尽量减少这种情况，本试验方法旨在使来自同一样本的不同实验室测试样本之间的一致性合理。 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 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====== 4.1 木材粘合剂的性能和成本通常与固体含量（非挥发性成分）有关。 4.2 本试验方法测定脲醛树脂的表观不挥发物含量。

1.1 This test method covers the determination of the apparent nonvolatile content of urea-formaldehyde resin solutions intended for use as wood adhesives. Due to the chemical nature of such resins, the nonvolatile content determined varies markedly according to the type of test used. In order to minimize this condition, this test method is designed to yield reasonably uniform agreement among different laboratories testing specimens from the same sample. 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 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 ====== 4.1 Wood adhesive performance and cost is often related to the solids level (nonvolatile content). 4.2 This test method determines the apparent nonvolatile content for urea-formaldehyde resins.