Share this page by mail High Temperature Graphite Felts 2,000 °C
Graphite Felts, up to 2,000 °C
Graphite is a mineral of elemental carbon (C) with a hexagonal crystalline structure. This soft and flexible material stands out with its black or grey-black colour. Carbon and graphite products are appreciated for their chemical and physical properties: chemical neutrality, heat resistance, thermal and electrical conductivity, low coefficient of thermal expansion, low coefficient of friction as well as low absorption coefficient of X-rays and electrons. Moreover, these products can be used in different fields: they can be found in pencils and alkaline batteries but also in the metallurgy, automobile and high technologies industries.
Graphite felts offer excellent thermal resistivity. They can indeed withstand operating temperatures up to 2,000 °C in inert atmosphere. These products are mainly used in the industry for the manufacture of different furnaces or the thermal insulation of vacuum furnaces.
Final Advanced Materials proposes flexible and rigid graphite felts with a thickess ranging from 6 to 50 mm. A purified version of these graphite felts is available, with a proportion of ash lower than 20 ppm.
For more information regarding the availability, refer to the technical data sheet.
Benefits of Graphite Felts
- Low thermal conductivity
- Low specific heat: allowing for rapid heating and cooling of furnaces.
- High thermal stability: in oxidizing atmospheres up to 350 °C, in protective or vacuum atmospheres up to approximately 3,000 °C for graphite and 1,000 °C for carbon.
- Ease of processing: can be cut with scissors or blades. Adapted to small flexural radii.
- Good surface properties: unaffected by all molten metals.
- High purity: low sulphury and ash content
- No electrostatic charging
- High resistivity: coupling in an inductive field only occurs above 12 kHz.
Applications of Graphite Felts
- Thermal insulation of vacuum furnaces and inert gas
- Degassing furnace
- Brazing furnace
- Annealing furnace
- Sintering furnace for metals
- Induction furnace
- Filter for hot or corrosive liquids and gas and molten metal
- Support for welding
General Data on HT Graphite Felts
Technical Data on HT Graphite Felts
Physical variables included in this documentation are provided by way of indication only and do not, under any circumstances, constitute a contractual undertaking. Please contact our technical service if you require any additional information.
FAQs that can help you in this category
Felts made from carbon/graphite fibre are excellent at withstanding high temperatures, and are used up to 3,000°C. These felts are stable up to 2,000°C, but only in an inert, oxygen-free environment. Otherwise, they oxidise above 300°C. Unlike carbon/graphite felts, zirconia felts are resistant to temperatures up to 2,000°C, even in the presence of oxygen in the environment.
Final Advanced Materials' biosoluble fibre felts are a safe alternative to replace asbestos-based insulation or other refractory fibres. These fibres have low biopersistence, meaning the body can eliminate any inhaled fibre rapidly and naturally. These felts have a low thermal conductivity and a temperature resistance of up to 1,400°C, and are used primarily as oven coatings, but also as a customisable local thermal insulation.
The only felts capable of withstanding a continuous exposure to temperatures exceeding 1,500°C are ceramic (Al2O3), zirconia (ZrO2) or graphite fibre-based felts. Each felt has specific constraints: graphite felts can only be used in an inert atmosphere or in a vacuum, while zirconia felts have poor mechanical properties, and ceramic fibre felts can only resist temperatures up to 1,650°C.
The other felt families (glass, silica, biosoluble, RCF, basalt, etc.) cannot withstand a continuous exposure to more than 1,260°C.
The material has a thermal conductivity of 0.06 W/m·K at 200°C, and 0.30 W/m·K at 1,000°C. It is substantially lower than that of conventional refractory materials (often between 1 and 2 W/m·K at these temperatures). The felts offered by Final Advanced Materials are available in several densities, ranging from 64 to 160 kg/m3. The higher the density, the lower the conductivity which can go as low as 0.20 W/m·K at 1,000°C.