Graphite Sheets (PERMA-FOIL™)
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.
Property Data
Typical properties
| Item | Unit | Grade | |||||||
|---|---|---|---|---|---|---|---|---|---|
| PF | PF-R2 | PF-HP | PF-G3 | PF-UHPL | PF-UHP | PF-UHPU | |||
| Operation temperature | ℃ | -200 to 3200 | |||||||
| Thickness | mm | 0.2/0.40/ 0.6/1.0 |
0.2/0.38/ 0.76/1.5 |
0.1/0.38/ 0.6/1.0 |
0.25/0.38/ 0.75/1.0 |
0.38 | 0.38/0.6/ 1.0/1.5 |
0.42/0.66/ 1.1/1.65 |
|
| Bulk density | Mg/m3 | 0.5 to 1.1 | 0.5 to 1.1 | 0.5 to 2.0 | 0.5 to 1.1 | 1.0 | 1.0 | 0.9 | |
| Oxidation loss | mass % | 40 | 25 | 40 | 3 | 5 | 5 | 5 | |
| Initial oxidation temperature | ℃ | 440 | 730 | 630 | 850 | 820 | 820 | 820 | |
| Tensile strength | MPa | 4.9 | 5.2 | 4.9 | 5.1 | 6.3 | 6.3 | 6.3 | |
| Sulfur content | mass ppm | 1000 | 1000 | 1000 | 1000 | < 1 | < 1 | < 1 | |
| Chlorine content | mass ppm | < 10 | < 10 | < 10 | < 10 | < 3 | < 3 | < 3 | |
| Compression rate | % | 47 | |||||||
| Recovery rate | % | 15 | |||||||
| Stress release rate | % | 4.0 | |||||||
| Ash content | mass % | 0.5 | 0.5 | 0.1 | 0.5 | < 20 mass ppm |
< 10 mass ppm |
< 10 mass ppm |
|
| pH | - | 5.1 | 5.1 | 5.1 | 5.1 | 7.0 | 7.0 | 7.0 | |
| Gas permeability rate (Nitrogen, 0.1MPa Differential pressure) |
m2/s | 1.3 X 10-10 | |||||||
| Coefficient of thermal expansion | Parallel 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℃.
*The thicknesses and densities shown above are standard sizes. Please contact our sales department regarding other sizes.
*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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