Graphite is a good choice for high-temperature applications up to 600°F (315°C). It has good chemical resistance, which makes it suitable for use in a wide range of chemicals and liquids. However, graphite is not as durable as Teflon and may wear out more quickly in high-pressure, high-speed applications.
PTFE, also known as Teflon, is extremely durable and can handle high-pressure and high-speed applications. It can also handle temperatures up to 500°F (260°C), although its chemical resistance is not as good as graphite. However, Teflon is a more expensive option than graphite. The choice between graphite and Teflon compression packing depends on the specific requirements of the application, including the operating temperature, pressure, and chemical compatibility.