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。仅规定了热暴露程序，而不是试验方法或试样。可通过选择适当的试验方法和试样来确定热对任何特定性能的影响。 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以国际单位制表示的数值应视为标准。 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 在本试验的恶劣条件下，试样的降解速度取决于受检土工膜的耐热性。 这种做法的高温应代表足够严重的条件，以在短时间内导致聚烯烃土工膜失效。 可使用实施规程D 3045中概述的温度和时间来评估特定特性随温度变化的速率 . 必须针对使用材料的特定应用，确定这种做法与这些材料的自然寿命之间的任何相关性。 空气烘箱老化可用于评估和比较各种热稳定剂包装的性能。

1.1 This practice covers a means for estimating the resistance of polyolefin geomembranes to thermal aging in the presence of air. Only the procedure for heat exposure is specified, not the test method or specimen. The effect of heat on any particular property may be determined by selection of the appropriate test method and specimen. 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 The values stated in SI units are to be regarded as the standard. 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== Under the severe conditions of this test, the specimens undergo degradation at a rate that is a function of the thermal endurance of the geomembrane under examination. The elevated temperature for this practice should represent conditions that are sufficiently severe to induce failure of polyolefin geomembranes within an abbreviated period of time. The rate of change of a particular property as a function of temperature may be evaluated using the temperatures and times outlined in Practice D 3045 . Any correlation between this practice and natural life of these materials must be determined for the particular application in which the materials are to be used. Air-oven aging can be used to evaluate and compare the performance of various heat stabilizer packages.