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Graphite Sheets(PERMA-FOIL®)

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.


Feature of Special Graphite Products

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
Graphite Sheets
It is extremely light when compared with other metals.
Graphite Sheets
It has excellent heat resistance.
Graphite Sheets

Manufacturing Process

Manufacturing Process


PERMA-FOIL® has excellent sealing properties, durability, and machinability. Our high purity products have gone through our unique purification process and are optimum as components in the nuclear energy industry, as spacer and packing used in the semiconductor industry, as radiator plates used in the electronics industry, and as other such components. Grades are arranged for all kinds of applications including: automotive gaskets, general industrial packing, pasts for semiconductor equipment, corrosion resistant seals, and a wide range of other applications. We produce this product in a wide array of size and shapes including rolls, cut sheets and custom shapes made to customer specification.

GradeCharacteristicsApplicationForms of Supplies
PF PERMA-FOIL® Standard products Automotive gaskets
General Industrial packing
Roll products
Cut products
cut products
PF-R2 Heat resistance improved version of standard products
PF-HP Low ash content products
PF-G3 Corrosion resistance and Heat resistance improved version of R2 Products Heat resistant gasket
PF-UHP,UHPU,UHPL High purity products Parts for High purity furnace for semiconductor and nuclear applications
Heat conducting material
Heat spreader

*For available dimension, please contact our sales department.

Property Data