TOP SEALING PTFE Graphite Impregnated Carbon Packing, STYLE 6900HG, is meticulously crafted from high-carbon continuous yarns that are softened and then braided. It is impregnated with proprietary lubricants and infused with graphite particles, which fill voids, serve as a break-in lubricant, and effectively block leakage. STYLE 6900HG is specifically designed for use in pumps or valves that operate under high pressure and high temperature conditions.