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Graphite Foil is an excellent sealing material for high temperature, high pressure transfer of liquids, gasses, steam, chemicals, and corrosives. The material is manufactured from high purity, high crystalline natural graphite flakes, which are processed into continuous foil by special acid and thermal treatments to produce expanded graphite crystals. The expanded graphite crystals are then formed into foil through a calendaring process without any resins and binders.
Temperature Ratings | |
Type | Standard Grade |
Oxidizing atmosphere (such as air) | -400°F to 950°F (-240°C to 510°C) |
Mild oxidizing atmoshpere (most gasket applications) | -400°F to 1500°F (-240°C to 850°C) |
Non-oxidizing atmosphere | 400°F to 5400°F (-240°C to 3000°C) |
Thermal Conductivity Btu in./hr/ft² | W/mK | |
Type | Standard Grade |
Parallel to sheet surface | 960 Btu in./hr/ft² (140 W/mK) |
Through thickness | 36 Btu in./hr/ft² (5 W/mK) |
Typical Physical Properties | |
Type | Standard Grade |
Tensile Strength (psi) | 650 psi (4.4Mpa) - 740 psi (5.0Mpa) |
Bulk Density | 62.4 lb./cu.ft. (1.0 g/cc) or 70 lb./cu.ft. (1.1 g/cc) |
Carbon Content | 95-99% |
Sulfur Content | 1000 ppm (Max) |
Leachable chloride content | 50 ppm (Max) |
Compressibility | 44% |
Recovery | 15% |
Creep relaxation | <5% |
Sealability | 0.017 fluid ounce/hr (0.5ml/hr) |
Coefficient of friction (against steel) | 0.018 @ 4 psi (0.03Mpa); 0.157 @ 12 psi (0.08 Mpa) |
Compression Strength (max. usable, unconfined) | 24,000 psi/165 (MPa) |
