ORIGRAF® Graphite Seals
Thanks to its structure, which provides it with the remarkable properties described below, the primary use for flexible graphite is in the sealing sector.
Compressibility: Flexible graphite can be compressed to a maximum density limit of 2.25 (ratio between mass & volume). The choice of initial densification is a major factor in the optimization of the final product’s characteristics.
Resiliency: Flexible graphite has a capacity for resiliency of about 10% in volume, making it possible to maintain seal performance over a broad temperature range.
Creep/relaxation: Flexible graphite has a very low creep rate in its service temperature range and holds up to high pressures.
Temperature resistance: In a reducing or inert atmosphere, flexible graphite retains its characteristics over a broad range of temperatures, from -196°C to 2500°C (-320.8°F to 4532°F) (sublimation temperature = 3500°C/6332°F). In the presence of oxygen, graphite forms CO or CO2 from 500°C to 550°C (932°F to 1022°F) upwards for high temperature grades. The speed of oxidation depends on the surface in contact with the oxidant object.
Aging: Flexible graphite is one of the non-metallic materials that is least affected by aging. This property is not influenced by temperature.
Radiation performance: Flexible graphite resists aging from high levels of radiation: no visible effect at 10-22 neutron/cm2.
Chemical inertness: Flexible graphite, which contains no binders, withstands most chemicals, such as mineral acids and solvents.
Lubrication: Flexible graphite is self-lubricating and has a low coefficient of friction (less than 0.10 with steel).
Processing: Flexible graphite is easy to cut using conventional manufacturing equipment/techniques.
Removability: Flexible graphite adheres very little on sealing surfaces.