Microfiber-Fluoroelastomer Composite Seal Materials

摘要

Very pure magnesium oxide fibers reinforced fluoroelastomer composite seal materials having excellent high temperature resistance and compression set resistance after long time periods at temperatures up to 500 F HAVE BEEN DEVELOPED. Outstanding compression set resistance was achieved by curing composites with peroxides. After post-curing by a vacuum oven-air oven process, the new seal material consists only of magnesium oxide fibers dispersed in a fluoroelastomer matrix which has very stable carbon-carbon crosslinks. Preliminary research also indicated that fluoroelastomer seal materials featuring a blend of magnesium oxide and carbon fiber reinforcement have very good heat aging resistance and low compression set. The best fiber reinforced compound had a compression set of 17% after 192 hours at 400 F and 43% after 72 hours at 500 F. (Author, modified-PL)