为了更好地了解安装在螺栓法兰接头中的增强柔性石墨板垫片的长期高温性能，压力容器研究委员会（PVRC）赞助的项目于1991年启动，并在1992-1993年由一家私营垫片制造商（Polycarbon，Inc.）参与扩展。根据特定的室温和高温试验程序，对这些垫片材料的高温性能进行了评估，包括和不包括不同类型的金属增强和/或钝化腐蚀和氧化抑制剂。根据1986年开发的材料技术研究所（MTI）PVRC垫片量化工具，对其长期高温接头行为进行了评估- 1987年主要用于弹性纤维增强板垫片材料，并扩展到柔性石墨垫片产品。本报告概述了获得的试验结果，以及柔性石墨板材料量化工具的开发，该工具可用于评估其在接头中可能的长期使用性能。

To better understand the long-term elevated temperature performance of reinforced flexible graphite sheet gaskets installed in a bolted flanged joint, a Pressure Vessel Research Council (PVRC)-sponsored program was launched in 1991 and was extended in 1992-1993 by the participation of a private gasket manufacturer company (Polycarbon, Inc.). The elevated temperature behavior of these gasket materials with and without different types of metallic reinforcement and/or passivating corrosion and oxidation inhibitor has been evaluated according to specific room and elevated test procedures. Their long-term elevated temperature joint behavior has been estimated on the basis of Material Technology Institute of the Chemical Process Industries (MTI)PVRC gasket quantification tools developed in 1986-1987 essentially for elastomeric fiber-reinforced sheet gasket materials and extended to flexible graphite gasketing products. This report presents a summary of the test results obtained and the development of quantification tools for flexible graphite sheet materials that permits the assessment of their probable long-term performance in service in a joint.