Graphite Sheets

PERMA-FOIL® is a flexible graphite sheet made from specially processed natural graphite without use of a binder. Special processing developed by us gives it a flexibility and compression recovery not found with conventional graphite products. These qualities ensure a snug fit with contacting parts, therefore it is widely used as a seal, to note automotive gaskets and packing.

photo of Graphite Sheets

Feature  product inquiry

PERMA-FOIL® is a generic term for the flexible graphite sheet that Toyo Tanso developed through our original manufacturing technology.
It is a sheet graphite product that is formed using select acid treated natural graphite, which is then compressed after undergoing high temperature expansion.
Only natural graphite is used as a raw material, which yields highly flexible carbon with excellent heat resistance and chemical resistance. Other features include a high compressibility recovery rate, excellent airtightness, and a high thermal conductivity.

Excellent Self-Lubrication

PERMA-FOIL® has self-lubricating properties due to its layered crystal structure, making it appropriate for use in high-temperature atmospheres and in fields where fluids and lubricants are avoided. In particular, its coefficient of friction in an unlubricated condition is low compared with other materials, making adhesion difficult to occur.

Stable in the wide range of temperature

Since PERMA Foil® is produced only from natural graphite without using a binder, it is stable in the wide range of temperature (-200℃~3200℃ inert atmosphere) enabling it to be used.

Flexibility, Compressibility recovery properties

This graphite sheet has flexibility and high recovery from compressive stress, which previously unobtainable with existing graphite products. Good matching with counter materials, which make it ideal for use as a sealing material.

Excellent Chemical Resistance

PERMA Foil® has excellent chemical resistance (acid, base) and is chemically stable.

Excellent Thermal and Electrical Conductivity

Thermal and electrical conductivity are excellent parallel to surface, and PERMA-FOIL® is optimum as a heat release material and as a heat transfer material.

Excellent Purity

High purity products that have undergone high temperature treatment with halogen gas have a very high purity. Since it has extremely high purity, it is optimum for components in semiconductor, IT, or nuclear energy industry application.

Graphite crystal structure


It is extremely light when compared with other metals.


It has excellent heat resistance.