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Isostatic graphite, made of high purity graphite by pressing, is an irreplaceable material used in the manufacturing of single crystal furnaces, metal continuous casting graphite crystallizers, and graphite electrodes for electrical spark discharge machining. In addition to these main applications, it is widely used in the fields of hard alloys (vacuum furnace heaters, sintering plates, etc.), mining (manufacturing of drill bit molds), chemical industry (heat exchangers, corrosion-resistant parts), metallurgy (crucibles), and machinery (mechanical seals).
| Physical and chemical performance indicators | BTG-16 | BTG-18 |
| Density（g/cm3） | ≥1.8 | ≥1.85 |
| largest particle（um） | ≤25 | ≤20 |
| Ash content （PPM） | ≤500 | ≤500 |
| Resistivity（µΩm） | ≤15 | ≤12 |
| Flexural strength（Mpa） | ≥40 | ≥45 |
| Compressive strength （Mpa） | ≥85 | ≥70 |
| Shore hardness | ≥50 | ≥55 |
| coefficient of dilatation C.T.E | ≥4.0 | ≥4.0 |
| elastic strength （Gpa） | ≥10.5 | ≥10.5 |
| Notice: 1. The ash content of all isostatically pressed materials can be purified to 50ppm. 2. Special production can also be done if there are special requirements for indicators. |
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| Size | Weight | Size | Weight |
| (mm) | (kg) | (mm) | (kg) |
| 400x400x310 | 99.52 | Φ350×450 | 91.45 |
| 400x400x400 | 127.5 | Φ400×450 | 117.84 |
| 400x400x500 | 158.6 | Φ500×450 | 180.64 |
| 400x400x600 | 189.7 | Φ520×500 | 215.97 |
| 550x300x160 | 54.6 | Φ585×600 | 324.25 |
| 770x400x180 | 112.41 | ||
| 900x540x260 | 250 | ||
| Notice: 1. The above data are reference values. If there is any error, the actual measured data shall prevail. 2. We can make special production according to the specifications, models and technical indicators of the products according to the needs of customers. 3. Larger sizes can be specially pressed, and smaller sizes can be further processed. The processed parts can be coated with anti-oxidation and anti-corrosion coatings according to the drawings. |
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The principle of isostatic pressing technology is based on Pascal’s law. It changes the unidirectional (or bidirectional) compression of the material into multi-directional (omnidirectional) compression. During the process, the carbon particles are always in a disordered state, and the volume density is relatively uniform with isotropic properties. Besides, it is not subject to the height of the product, thus making the isostatic graphite have no or little performance differences.
According to the temperature at which the forming and solidification take place, isostatic pressing technology can be divided into cold isostatic pressing, warm isostatic pressing, and hot isostatic pressing. Isostatic pressing products have a high density, typically 5% to 15% higher than those of unidirectional or bidirectional mold pressing products. The relative density of isostatic pressing products can reach 99.8% to 99.09%.
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