GFO / PTFE Graphite Gland Packing It is a flexible braided packing made of innovative pure graphite expanded yarn. It can be used to seal hot water, high temperature and pressure steam, leat transfer fluid, hydrogen gas, ammonia, organic solvents, hydrocarbons, cryogenic fluids, etc., except a little strong oxidizer. They can be applied to equipment and devices in the peroleum industry, power, chemical, pharmaceutical and light generation.