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Permeation and Stress Relaxation Testing of Fuel Seal Materials; A Comparison of Fuel System Elastomers

机译：燃料密封材料的渗透和应力松弛测试;燃料系统弹性体的比较

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The subject of fuel permeation has been thoroughly investigated and documented in several SAE and industry technical papers. Most of these papers deal with fuel permeation through items such as fuel tanks, and plastic and rubber fuel and filler hose. With ultra low emissions regulations coming on board, such as those from California (CARB) in 204 dictating no more than 0.5 g/day of hydrocarbon loss, one area of emissions that has not been documented well is permeation through the rubber seals used in the fuel system. In the past, permeation and micro leaks through seals had not been a significant source of fuel emissions, but the new regulations require attention to detail in all areas of sealing a fuel system. Seals will need to resist permeation, and will need to retain their sealing force over long periods of time. To investigate this phenomenon, DuPont Dow Elastomers Akron lab took permeation cups, ASTM E96-66 test method, and retrofitted the cups with stainless steel lids. Then gaskets based on different fuel handling elastomers were used to seal the steel lid against the body of the cup to see if fuel permeation through the seal could be detected. In addition to testing permeation through seals, stress relaxation in hot fuel was run on some of the same elastomers. Both fuel losses through seals and retained sealing force measurements will be presented in this paper.
机译：燃料渗透的主题已经彻底调查并记录在几个SAE和工业技术论文中。这些论文中的大多数通过燃料箱和塑料和橡胶燃料和填充软管等物品处理燃料渗透。随着超低排放法规，如204年从加利福尼亚（碳水化合物）中的超低排放法规不超过0.5克/天的碳氢化合物损失，尚未记录的一个排放区域是通过所使用的橡胶密封件渗透燃油系统。过去，通过密封件渗透和微泄漏并不是燃料排放的重要来源，但新规定需要在密封燃料系统的所有领域注重细节。密封件需要抵抗渗透，并且需要在长时间内保留密封力。为了调查这种现象，杜邦陶氏菌弹性体Akron Lab采用渗透杯，ASTM E96-66测试方法，并用不锈钢盖子改造杯子。然后，基于不同的燃料处理弹性体的垫圈用于将钢盖密封靠在杯子的主体上，以检测通过密封件燃料渗透。除了通过密封件进行测试外，在一些相同的弹性体上运行热燃料中的应力松弛。本文将介绍通过密封件和保留的密封力测量的燃料损失。

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