3.1 This practice describes procedures to use in determining the effects of an open-flame carbon-arc light source, an enclosed carbon-arc light source, a xenon-arc light source, or a fluorescent UV source along with heat and moisture on rubber specimens held in a jig or holder with or without a specified strain. The purpose is to attempt to accelerate the effects produced by light, heat, and moisture in the natural environment. Exposures are not intended to simulate the deterioration caused by localized weather phenomena, such as atmospheric pollution, biological attack, and saltwater exposure. The Significance and Use section in Practice G151 and the standard for the appropriate apparatus, that is, Practices G152, G153, G154, or G155 should be consulted for additional information on significance and use of the exposure tests.
3.2 The primary criterion used in estimating resistance to weathering is the percentage decrease in tensile strength and in elongation at break. A supplementary criterion for estimating resistance to weathering is the observed extent of surface crazing and cracking.
3.3 Results obtained by use of these test procedures should not be represented as equivalent to those of any natural exposure test until the degree of quantitative correlation has been established for the material in question.
3.4 Because of differences in the spectral power distributions of the exposure sources as well as the other conditions in the different types of laboratory weathering tests, the different procedures may not result in the same performance rankings or types of failure modes of the materials. Comparisons shall not be made of relative stabilities of materials exposed in different types of apparatus.
3.5 When conducting exposures in devices that use laboratory light sources, it is important to consider how well the artificial weathering conditions will reproduce property changes and failure modes caused by end-use environments on the materials being tested.
3.6 Practices G151, G152, G153, G154, and G155 recommend that a similar material of known performance (a control) be exposed simultaneously with the test specimen to provide a standard for comparative purposes. Preferably, a control material known to have poor durability as well as one that has good durability should be used. The reason for using a control is that reproducibility in ranking stabilities is usually bett............
常用测试标准通用标准标准号标准名称ISO 4892-1塑料-实验室光源暴露方法-第1部分ASTM G151用实验室光源的加速试验装置中曝光非金属材料的标准实施规程ASTM G154非金属材料荧光紫外曝露设备的操作标准GB/T 14522机械工业产品用塑料、涂料、橡胶材料人工气候老化试验GB/T 31881汽车非金属部件及材料紫外加速老化试验方法橡胶标准标准号标准名称GB/T16585硫化橡胶人工气候老化...
2部分:氙弧灯ASTM D2565户外用塑料的氙弧型曝光装置的标准实施规程ASTM D4459 室内用要求曝露于氙弧灯的塑料标准实施规程ASTM D5071暴露在氙气灯的可光降解塑料的标准实施规程橡胶相关氙灯老化标准标准号标准名称ISO 4665硫化或热塑性橡胶-耐候性GB/T 12831硫化橡胶人工气候(氙灯)老化试验方法涂料行业相关氙灯老化标准标准号标准名称ISO 11341色漆和清漆人工气候老化和人工辐射暴露...
对于硫硫化仪选用要注意以下几大基准因素: 1、准确性:主要靠NITS(国家标准和技术研究院)认可的扭矩标准来证明。另一方面,为了证明硫化仪的性,试验某一橡胶胶料时需要用一种标准的基准胶料。但由于橡胶胶料通常都不具备足够的贮存稳定性,因此,到目前为止尚无国家承认的标准基准胶料。通常情况下,橡胶胶料的室温贮存对硫化性能有影响。 ...
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