Technetics Group is the leader of custom-designed High Performance Sealing Solutions in Demanding Environments with applications in the nuclear, oil and gas, life sciences, aerospace, semiconductor and other industries. Through the combination of eight of the world’s best-known sealing and critical component design and manufacture businesses comes Technetics Group. Technetics Group brings together brand names that are used throughout the world in critical markets. Our brands include: HELICOFLEX® resilient metal seals, ORIGRAF® graphite seals, BELFAB® edge-welded metal bellows, and FELTMETAL™ abradable seals and acoustic media.

SEALING SOLUTIONS

GRAPHITE SEALS

FLEXIBLE

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.

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