Packing material is a sealing element used inside valves, pumps, and piping equipment to prevent fluid leakage along the moving parts (such as valve stems or pump shafts). It fills the space between the valve stem/shaft and the bonnet or stuffing box to form a tight seal, while still allowing movement.
Made from asbestos fibers, sometimes impregnated with lubricants or graphite.
Good heat resistance, but rarely used now because asbestos is hazardous.
Made from flexible or braided graphite.
Excellent heat resistance (up to 450–650 °C).
Chemically resistant → used in high-temperature, high-pressure steam, and chemical services.
Made from Polytetrafluoroethylene (PTFE).
Excellent chemical resistance and low friction.
Suitable for corrosive fluids but not for very high temperatures.
Braided carbon fiber, sometimes with graphite.
High strength, good thermal conductivity, and chemical resistance.
Used in pumps and valves for chemicals, steam, and hot water.
Made from soft metals like lead, aluminum, or copper.
Can withstand very high pressure and temperature.
Rarely used today, replaced by graphite and advanced composites.
Made from synthetic fibers (aramid, acrylic, Kevlar®) with lubricants.
Environmentally safe alternative to asbestos.
Used in general service applications.
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