Share this page by mail Graphite gasket sheet
Gasket sheets use high quality expanded graphite without any adhesive or sealing elements. They can be used at high temperatures up to 3000°C in an inert atmosphere or a vacuum. We stock 1 and 2 mm thicknesses, with a dimension of 1000 x 1000 mm². These sheets are often used with rigid felts as a coating on one or both surfaces.
Principal characteristics of graphite gasket sheets
- Soft and flexible
- Inert, highly impermeable
- Light
- Easy to machine, cut or punch
- Heat dissipation, electrical conductivity
- Excellent chemical resistance
- Ash content : ≤ 0.15%
Gasket sheets with a volumetric mass density of 1.0 g/cm³
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Temperature resistance : Approximately 400°C in air and 3000°C in an inert environment or a vacuum
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Thermal conductivity : Parallel to the surface: 190 W/m.K, perpendicular to the surface: 5 W/m.K
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Specific heat capacity (20°C): 0.7 kJ/K.kg
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Thermal expansion coefficient (20-1000°C) : Parallel to the surface: approx. 1.10-6/K, perpendicular to the surface: approx. 50.10-6/K
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Breaking strain : ≥ 1 %
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Tensile strength : ≥ 4 N/mm²
Applications of graphite gasket sheets
- Thermal screens,
- Protective coating,
- Diffusion barrier,
- Anti-adhesive protection,
- Heating elements.
FAQs that can help you in this category
Graphite can withstand different temperatures depending on the atmosphere in which it is used. Its working environment directly affects its thermal performances.
In a vacuum or an inert atmosphere, graphite can withstand extremely high temperatures, even above 2,000°C. If oxygen is not present, the material retains excellent thermal and structural stability.
In air or an oxidising atmosphere, however, the maximum working temperature is lower. At around 400 to 500°C and above; graphite starts to oxidise gradually on contact with oxygen, leading to a degradation of its properties and loss of material.
Choosing the right graphite grade and considering the atmospheric conditions in which the graphite will be used is absolutely necessary to obtain the performance and lifetime needed for a given application.
The Final Advanced Materials team is at your disposal to help you choose the most suitable graphite solution based on your thermal and environmental constraints.
Due to its layered crystalline structure, graphite has excellent electrical and thermal conductivity properties.
This organisation facilitates the movement of electrons and the propagation of heat within the material.
However, graphite also has anisotropic properties: its conductivity varies depending on the direction of the crystalline layers. Conductivity is thus higher in the direction parallel to the layers than in the direction perpendicular to them.
Parameters such as the graphite's purity and density also influence its electrical and thermal characteristics. All these characteristics therefore determine the level of conductivity of the material.
Despite these variations graphite remains an excellent thermal and electrical conductor, which is particularly suited to many demanding industrial environments.
The Final Advanced Materials team is at your disposal to help you choose the most suitable graphite for your technical requirements.
Graphite is an excellent solution for aggressive chemical environments.
Due to its great chemical stability, it resists most acids and bases, including at high concentrations.
Unlike metals, graphite does not rust and does not dissolve in most corrosive environments, making it a material which is particularly suitable for demanding applications.
However, there are certain limitations which be taken into account. In the presence of oxygen and high temperature, graphite is subject to oxidisation which can impair its properties. In addition, in fluorinated environments, in particular in the presence of hydrofluoric acid, a direct chemical reaction with carbon can occur.
The choice of graphite and working conditions therefore depends on the application's chemical and thermal environment.
The Final Advanced Materials team is at your disposal to help you choose the best graphite for your technical requirements.
A graphite-loaded cement is a particularly suitable solution for repairing graphite parts.
Its chemical compatibility with the material, along with its thermal expansion and electrical conductivity, which are similar to those of graphite, make it a preferred solution for this type of application.
Ceramic-loaded cements are particularly recommended for localised repairs which do not require high a mechanical strength.
The Final Advanced Materials team is at your disposal to help you choose the best solution for your technical constraints.
Graphite naturally possesses lubricating properties which is one of its most widely acknowledged characteristics.
Due to its layered structure, where the different layers easily slide over one another, it is an excellent solid lubricant.
However, its performance can vary depending on the working environment. In an inert atmosphere or in a vacuum, its effectiveness diminishes due to the scarcity of gas and moisture, elements which make it easier for the graphite layers to slide over one another.
However, in an oxidising, high-temperature atmosphere the main challenge is its natural oxidisation, which can impair the graphite’s properties.
The choice of graphite therefore depends directly on the working conditions and on the constraints specific to your application.
The Final Advanced Materials team is at your disposal to help you select the graphite solution which is most effective and best suited to your needs.