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现行 ASTM D4502-92(2019)
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Standard Test Method for Heat and Moisture Resistance of Wood-Adhesive Joints 木材胶接接头耐热和防潮性的标准试验方法
发布日期: 2019-03-01
1.1 本试验方法的目的是估计粘接接头的耐热性和耐水解性。 1.2 本试验方法主要适用于木材与木材之间的接缝,但也可适用于木材与其他材料之间的接缝。 1.3 可以估计木材中的化学物质(如阻燃剂、防腐剂和抽提物)对接头抗降解性的影响。 1.4 本试验方法不考虑应力(另一个主要降解因子)的影响,也不考虑循环或可变温度或湿度水平。 1.5 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考,不被视为标准值。 1.6 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。 1.7 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 该试验方法可作为耐久性评估和使用寿命预测的有用工具。 5.1.1 本试验方法可用于测量热量和水分的影响及其相互作用对粘合剂和粘结接头的影响。了解这些效应对粘合剂配方设计师或制造商很有用。湿热老化对于确定酸性粘合剂系统对木材粘附物水解的影响特别有用。 5.1.2 本试验方法提供了一种比较未知粘合剂降解速率的方法- 粘附物组合是指已知组合在热老化或水解老化环境中的降解速率。这种比较有助于粘合剂制造商向市场推出新产品,并帮助设计师选择粘合剂。 5.1.3 该试验方法不会复制任何自然使用环境,但它确实提供了一种在类似环境中估算接头使用寿命的方法。使用寿命估算对粘结结构或使用粘结产品的结构的设计者很有用。 5.2 使用寿命估计取决于以下假设:在高温老化条件下,化学降解机理与在使用温度下相同。然而,并非所有情况下都是这样。这种可能性,加上试样制备、老化暴露和强度测量中的可变性,要求在接受使用寿命估计时谨慎行事。
1.1 The purpose of this test method is to estimate the resistance of adhesive-bonded joints to thermal and hydrolytic degradation. 1.2 This test method is primarily for wood-to-wood joints but may be applied to joints of wood to other materials. 1.3 The effects of chemicals such as fire retardants, preservatives, and extractives in the wood upon joint degradation resistance can be estimated. 1.4 This test method does not account for the effects of stress, the other principal degrading factor, nor does it account for cyclic or variable temperature or moisture levels. 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.6 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. 1.7 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 can serve as a useful tool for durability assessment and service life forecasting. 5.1.1 This test method can be used to measure the effects of heat and moisture and the effect of their interaction on adhesives and bonded joints. Knowledge of these effects is useful to an adhesive formulator or manufacturer. Moist heat aging is particularly useful for determining the effects of acidic adhesive systems on the hydrolysis of wood adherends. 5.1.2 This test method provides a means of comparing the rate of degradation of an unknown adhesive-adherend combination to the rate of degradation of a known combination in thermal or hydrolytic aging environments. Such a comparison can be useful to adhesive manufacturers for introducing a new product to the market and for helping designers selecting adhesives. 5.1.3 This test method does not duplicate any natural service environment, but it does provide a means of estimating the service life of joints in similar environments. Service-life estimates are useful to designers of bonded structures or structures using bonded products. 5.2 Service-life estimates rely on the assumption that the chemical degradation mechanism is the same at the elevated aging temperatures as at the service temperature. However, this may not be true in every case. This possibility, together with the variability in specimen preparation, in the aging exposures, and in the strength measurements, require that caution be used in accepting the estimate of service life.
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归口单位: D14.70
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