ASTM C1442-14由美国材料与试验协会 US-ASTM 发布于 2014。
。
* 在 ASTM C1442-14 发布之后有更新,请注意新发布标准的变化。
5.1 This practice determines the effects of actinic radiation, elevated temperature, and moisture on sealants and their constituents under controlled laboratory artificial weather test conditions.
5.2 When conducting exposures in devices which use laboratory light sources, it is important to consider (1) how well the artificial test conditions will reproduce property changes and failure modes caused by end-use environments on the sealant being tested and (2) the stability ranking of sealants. Refer to Practice G151 for full cautionary guidance regarding laboratory weathering.
5.3 Because of differences in the spectral power distributions of the exposure sources (xenon arc, fluorescent UV lamps, and open flame carbon arc), as well as other conditions used in the three types of laboratory weathering tests, including temperature, type and amount of moisture, and test cycles, these three procedures may not result in the same performance ranking or types of failure modes of sealants. Further, different exposure durations may be required for testing the weathering performance of sealants by the three types of exposures. Comparisons should not be made of the relative stability of sealants exposed in the different types of apparatus.
5.4 Variations in results may be expected when operating conditions are varied within the accepted limits of this practice. Therefore, all test results using this practice must be accompanied by a report of the specific operating conditions as required in Section 10. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained according to this practice.
5.5 No laboratory exposure test can be specified as a total simulation of actual use conditions in outdoor environments. The relative durability of materials in actual use conditions can vary in different locations because of differences in UV radiation, time of wetness, relative humidity, temperature, pollutants, and other factors. Results obtained from these laboratory accelerated exposures can be considered as representative of actual use exposures only when the degree of rank correlation has been established for the specific materials being tested and when the failure mode is the same. Exposure of a similar material of known outdoor performance, a control, along with the test specimens provides for evaluation in terms of relative durability under the test conditions, which also greatly improves the agreement in test results among different laboratories.
5.6 The acceleration factor relating the exposure time in a laboratory accelerated test to exposure time outdoors required to produce equivalent degradation is material dependent and can be significantly different for each material and for different formulations of the same material. Therefore, the acceleration factor determined for one material cannot be assumed to be applicable to other materials.
5.7 Results of this procedure will depend on the care that is taken to operate th......
湿热老化试验通过模拟温度和湿度环境对高分子材料进行加速老化,以评估材料在应用过程中的耐温度和湿度的老化性能。测试仪器:湿热老化试验箱适用产品范围:塑料、橡胶等高分子材料。样品要求:试验样品应在不包装、不通电、准备使用状态或按有关标准的其他规定放入试验箱中。如没有规定特定的安装架,那么安装架的热传导应尽可能低,使得实际上对所有的试验样品都是绝热的。...
实验室加速老化实验是指通过设备模拟气候环境中的太阳光、温度以及潮湿等相互作用,加速激发产品在长期环境中可能发生的失效,以此来验证其是否达到预期的质量目标。标准集团技术工程师下面列举一些常见的老化可靠性检测设备,希望对每个客户都有所帮助。 1.紫外老化测试 紫外老化测试采用荧光紫外灯为光源,通过模拟自然阳光中的紫外辐射和冷凝,对材料进行加速耐气候性试验,以获得材料耐候性的结果。...
老化试验相关标准GB/T16422.2 塑料实验室光源暴露试验方法第2部分:氙弧灯GB/T3511-2008 硫化橡胶或热塑性橡胶耐候性GB/T1865-2009 色漆和清漆人工气候老化和人工辐射曝露(滤过的氙弧辐射)GB/T16422.3 -1997塑料实验室光源暴露试验方法第3部分:荧光紫外灯GB/T3511-2008 硫化橡胶或热塑性橡胶耐候性GB/T14522-2008 机械工业产品用塑料、...
Copyright ©2007-2022 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证:京ICP证110310号