ince these are manufactured from pure flexible graphite, they provide excellent sealing at very high temperatures up to 6500c & pressures up to 300 bars. They are supplied in various forms such as: Corrugated tapes with or without adhesive for valve stem packing & flange gasketing.Die Moulded rings that are custom made.Pre- Cut gaskets.Sheet with or without metal reinforcement from which gasket can be cut to size.