A high purity graphite block is a precision-engineered carbon product made from premium raw materials such as petroleum coke and pitch, then processed through high-temperature graphitization (up to 3000°C). With a typical carbon content of ≥ 99.9%, these blocks are designed for applications requiring ultra-low contamination, high thermal conductivity, and excellent chemical resistance.
High purity graphite blocks are essential in semiconductor manufacturing, solar photovoltaics, metallurgy, EDM machining, and high-temperature processing environments.
Key Features:
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Ultra-High Carbon Content: Purity ≥ 99.9%, suitable for demanding cleanroom and high-vacuum environments
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Outstanding Thermal Stability: Maintains structural integrity at temperatures exceeding 2500–3000°C in inert atmospheres
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Chemical Resistance: Inert to most acids, alkalis, and corrosive gases under controlled conditions
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Low Outgassing: Ideal for vacuum furnace parts, crystal growth, and aerospace tooling
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Excellent Machinability: Easily shaped into custom parts and complex geometries with tight tolerances
Typical Applications:
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Semiconductor Industry: Wafer boat carriers, susceptor plates, and diffusion trays
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Solar Energy (Photovoltaics): Crucibles, insulation, and processing plates for mono- or poly-silicon growth
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High-Temperature Furnaces: Fixtures, heating elements, and insulation blocks
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EDM Electrodes: Used for precision mold making where material purity and surface finish are critical
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Laboratory & Scientific Use: Sample holders, reaction vessels, and analytical instruments
Technical Specifications (Typical):
| Property | Value Range |
|---|---|
| Carbon Purity | ≥ 99.9% (can be up to 99.999%) |
| Bulk Density | 1.70 – 1.90 g/cm³ |
| Electrical Resistivity | 8 – 12 µΩ·m |
| Compressive Strength | 60 – 130 MPa |
| Flexural Strength | 20 – 55 MPa |
| Thermal Conductivity | 100 – 170 W/m·K |
| Ash Content | ≤ 0.03% (ultra-low impurity) |
| Operating Temp. Limit | Up to 3000°C (in inert/vacuum) |
Available Grades:
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Purified Graphite (≥99.9%) – for standard high-purity applications
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Ultra-High Purity Graphite (≥99.99% or ≥99.999%) – for semiconductors and ultra-clean processing
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Isotropic or Fine Grain Options – for consistent strength and uniformity in machining
Standard Sizes & Customization:
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Block Sizes: 300×300×100 mm, 400×400×200 mm, 600×600×300 mm, or per specification
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Custom Machining: CNC services available for precision parts and graphite tooling
Packaging & Storage:
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Vacuum-sealed or foam-protected packaging to prevent contamination
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Store in dry, clean, and controlled environments
