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

Property Data

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Typical properties

ItemUnitGrade
PF PF-R2 PF-HP PF-G3 PF-UHPL PF-UHP,UHPU
Operation temperature -200~3200
Thickness mm 0.2~1.0 0.2~1.5 0.05~1.0 0.2~1.0 0.38 0.2~1.5
Bulk density Mg/m3 0.5~1.1 0.5~1.1 0.5~2.0 0.5~1.1 1.0 1.0, 0.9
Oxidation loss mass % 40 25 40 3 5 5
Initial oxidation temperature 440 730 630 850 820 820
Tensile strength MPa 4.9 5.2 4.9 5.1 6.3 6.3
Sulfur content mass ppm 1000 1000 1000 1000 < 1 < 1
Chlorine content mass ppm < 10 < 10 < 10 < 10 < 3 < 3
Compression rate % 47
Recovery rate % 15
Stress release rate % 1.0
Ash content mass % 0.5 0.5 0.1 0.5 < 20
mass ppm
< 10
mass ppm
pH - 5.1 5.1 5.1 5.1 7.0 7.0
Gas permeability rate
(Nitrogen, 0.1MPa Differential
pressure)
m2/s 1.3 X 10-10
Coefficient of thermal expansionParallel to
surface
1/K 5 X 10-6
Perpendicular to
surface
2 X 10-4
Thermal conductivity
(25℃)
Parallel to
surface
W/(m・K) 200
Perpendicular to
surface
5
Electrical
resistivity
(25℃)
Parallel to
surface
μΩ・m 7
Perpendicular to
surface
1,000
Flammability - Equivalent to UL94 V-O

*The figures above are typical values, and are not guaranteed.
*Property data with the density of 1.0Mg/m3.
*Oxidation loss is the measurement for 1 hour at 670℃.
*Initial oxidation temperature represents the kick-off temperature of mass decrease by the result of measurement using a thermobalance in the air atmosphere.
*The measurement temperature range for the coefficient of thermal expansion is 300 to 400℃.
*There are constraints of size depending on the size, thickness and bulk density.
*There are standard size for each grade, thickness or bulk density.
*Before actually using one of our products, please be sure to contact our sales department to consult on selecting the most appropriate grade.

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