Full definition
Compression packing manufactured from expanded/flexible graphite (either as braided yarn, die-formed rings, or laminated tape), providing the widest temperature range of any packing material: -200 to +650°C in non-oxidizing (steam, inert gas, hydrocarbon) environments, and up to +450°C in oxidizing (air) environments. Key properties: extremely low friction coefficient (0.05-0.1, minimizing shaft wear and energy consumption), excellent conformability (graphite deforms plastically to fill surface imperfections), outstanding thermal conductivity (dissipates frictional heat), inherent lubricity (does not require external lubrication), and broad chemical compatibility (resists most chemicals except strong oxidizing acids). Types: braided yarn packing (most common for pump and valve service), die-formed rings (precise dimensions, fastest installation), and laminated tape (for large-diameter or non-standard stuffing boxes). Per API 622 (fugitive emissions), TA-Luft compliance, and ISO 15848. Graphite packing has largely replaced asbestos in high-temperature service. Brands: Garlock (Graphite Gland), John Crane (Safematic), Chesterton (1400 series), Palmetto.