Durlon® takes our standard mica-graphite manufacturing technology two steps further by: (1) incorporating 3 full layers of HT1000™ on the ID and OD of the sealing element and (2) using oxidation inhibited flexible graphite layers as the central sealing component. This oxidation boundary created by the HT1000™ material allows for temperature stability up to 1,000°C (1,800°F).