1.1 本规程涵盖了估算聚烯烃土工膜在空气中热老化阻力的方法。 1.2 本规程应作为比较材料热老化特性的指南，通过某些相关特性的变化来测量。在应力、环境、温度和时间控制之间的相互作用失效的情况下，本规程不会预测热老化特性。 1.3 本规程有助于聚烯烃土工膜配方的开发。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 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。 1.6 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 在本试验条件下，试样的降解速率是受检聚烯烃土工膜耐热性的函数。 4.2 可以使用实践中概述的温度和时间来评估特定特性随温度变化的速率 D3045 . 4.3 必须针对使用聚烯烃土工膜的特定应用，确定本规程与聚烯烃土工膜使用寿命之间的任何相关性。 4.4 空气烘箱老化可用于评估和比较暴露于空气氧化的各种热稳定剂包的性能。

1.1 This practice covers a means for estimating the resistance of polyolefin geomembranes to thermal aging in the presence of air. 1.2 This practice should be used as a guide to compare thermal aging characteristics of materials as measured by the change in some property of interest. This practice does not predict thermal aging characteristics where interactions between stress, environment, temperature, and time control failure. 1.3 This practice is useful for the development of formulations of polyolefin geomembranes. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 ====== 4.1 Under the conditions of this test, the specimens undergo degradation at a rate that is a function of the thermal endurance of the polyolefin geomembrane under examination. 4.2 The rate of change of a particular property as a function of temperature may be evaluated using the temperatures and times outlined in Practice D3045 . 4.3 Any correlation between this practice and service life of polyolefin geomembranes must be determined for the particular application in which they are to be used. 4.4 Air-oven aging can be used to evaluate and compare the performance of various heat stabilizer packages exposed to air oxidation.