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Classification of Graphite Materials for Electrodes and High-Temperature Applications
Graphite products are widely used in semiconductor thermal fields, aerospace nozzles, arc furnace electrodes, and chemical electrolysis systems. Featuring ultra-high purity, excellent thermal resistance, and low electrical resistivity, they serve as essential materials in advanced manufacturing and energy industries.
Description
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Product Overview
Graphite materials are categorized based on forming methods, grain size, purity levels, and density. The six types of graphite blocks shown below are widely used in graphite electrode production, EDM (Electrical Discharge Machining), semiconductor thermal fields, and high-temperature metallurgy, meeting a range of industrial performance requirements.
1. Isostatic Graphite
Produced through uniform isostatic pressing, this graphite offers an isotropic structure with:
● High bulk density and compact microstructure
● Low electrical resistivity and excellent conductivity
● High thermal conductivity
● Exceptional oxidation resistance and thermal shock resistance
Typical Applications: EDM electrodes, crucibles for solar industry, semiconductor heating components, hot pressing molds for aerospace composites.
2. High Purity Molded Graphite
With ultra-low ash content (<50 ppm) and carbon purity ≥99.99%, it is ideal for:
● Ultra-clean vacuum or inert gas environments
● Semiconductor and photovoltaic applications sensitive to metallic impurities
● High-temperature sintering and crystal growth furnaces
3. Fine Grain High Strength Graphite
With average particle size ≤10 µm, this material offers:
● Excellent flexural and compressive strength
● High machining precision and surface finish
● Ability to fabricate complex-shaped components
Applications: EDM electrodes, electronic molds, precision forming tools.
4. General-Purpose Molded Graphite
Cost-effective and stable in physical performance:
● Medium density and thermal conductivity
● Easy to machine
● Wide range of industrial applicability
Applications: Furnace linings, thermal field components, carbon brushes, graphite liners.
5. Medium-Coarse Grain Graphite
With grain size ranging from 0.8–1.5 mm, it provides:
● Strong resistance to thermal shock
● Dimensional stability during temperature fluctuations
Applications: Electrode bases, industrial furnace support structures, metallurgical molds.
6. Large Grain Graphite
Visible grain size >2 mm, suitable for high thermal load and breathable applications:
● Rapid heat conduction and good thermal stability
● Ideal for harsh thermal environments and heavy-duty applications
Applications: Steel casting molds, ladle bottoms, converter base lining blocks.
Typical Technical Parameters
| Parameter | Value Range |
| Bulk Density | 1.60–1.85 g/cm³ |
| Compressive Strength | 40–90 MPa |
| Electrical Resistivity | 8–15 µΩ·m |
| Thermal Conductivity | 80–160 W/m·K |
| Ash Content | ≤0.1% (High Purity <50 ppm) |
| Average Grain Size | ≤10 µm to >2 mm |
| Max Operating Temp | ≤3000°C (in inert atmosphere) |
All parameters are typical values, tested per ASTM / ISO standards.
Summary
From fine-grain isostatic graphite to coarse-grain casting blocks, each grade of graphite serves specific industrial and engineering needs. We offer custom machining services based on customer drawings, with flexible options for size, purity, and density. Our graphite materials are widely used in EDM electrode fabrication, semiconductor thermal systems, solar sintering furnaces, metal casting molds, and metallurgical processing equipment, ensuring long-term stability and performance.
Custom graphite plates and precision components available upon request. CNC machining and high-purity treatment supported. Suitable for all extreme-temperature environments.
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